KEYWORDS: Fluorescence, Solids, Fluorescence intensity, Luminescence, Ultraviolet radiation, Emission wavelengths, Molecules, Scanning electron microscopy, Microsoft Foundation Class Library, Light absorption
Mechanofluorochromic (MFC) materials, as a kind of fluorescence stimulus response materials, can show obvious changes under external stimuli, so it has become a research hotspot in the field of advanced optical materials. MFC compounds can further benefit their properties from stimulus-responsive materials with aggregation-induced emission (AIE) characteristics. Therefore, by combining triphenylethylene with benzimidazole derivatives, we designed and synthesized a simple organic small molecule DTITA with AIE and reversible mechanofluorochromism characteristics, and the material of solid fluorescence can be regulated through the utilization of mechanical grinding and DCM fumigation cycles. This offers a new way for the invention of new intelligent materials.
A symmetrical diarylethene bearing two differerent substituents was synthesized successfully, its photochromic
properties in solution and PMMA film were investigated in detail, respectively. In addition, the diarylethene as
rewritable optical recording media was also performed successfully.
A new photochromic diarylethene compound [1-(2-methyl-1-naphthyl), 2-(2-methyl-5-(2-1,3-dioxolanephenyl)-3-
thienyl)]perfluorocyclopentene 1o, and its photochromic properties, fluorescence switch and kinetic properties were
investigated in detail. Diarylethene 1o changed the color from colorless to red when irraditated with 297 nm UV light,
which the absorption maxima were observed at 503 nm in hexane solution. This new photochromic system also showed
remarkable fluorescence switching in the solid state. Finally, using this diarylethene as recording medium, polarization
optical recording was carried out successfully.
A new unsymmetrical photochromic diarylethene 1-(2-methylthiophene-3-yl)-2-[(2-n-butyl-5-formyl)thiophene-3-yl]perfluoroncyclopentene(1a), was synthesized and its optoelectronic properties, such as photochromism in solution as well as in poly-methylmethacrylate (PMMA) amorphous films, and the fluorescence spectra of diarylethene 1a was investigated. Using diarylethene 1b/PMMA film as recording medium and a linearly polarized 633 nm laser diode for
recording and readout, polarization multiplexed image recording can be carried out in this film, which illustrated that the
diarylethene can be potentially used as holographic optical recording medium.
A novel photochromic diarylethene based on benzofuran moiety and a chlorine atom was synthesized, and its
photochromic and fluorescent properties were investigated. This compound exhibited reversible photochromism,
changing from colorless to violet after irradiation with UV light both in solution and in poly-methyl methacrylate
(PMMA) amorphous film. Also, it exhibited remarkable fluorescence switching in PMMA film. The results indicated
that the benzofuran moiety played a very important role during the process of photochromic reaction for the diarylethene
derivative. Using this diarylethene 1c/PMMA as optical storage was performed successfully.
A new photochromic diarylethene compound, 1-[2-methyl-5-(3-methoxylphenyl)-3-thienyl]-2-[2-methyl-5-(3-
trifluoromethylphenyl)-3-thienyl]perfluorocyclopentene (1a), was synthesized and its photochromism and photo-induced
anisotropy was investigated. It showed good photochromism both in solution and PMMA amorphous film by photoirradiation.
In hexane, the colorless solution turned to blue with a new broad absorption band centered at 579 nm upon
irradiation with 254 nm UV light. The blue colored solution returned to colorless upon irradiation with visible light (λ >
500 nm). The open-ring isomer of 1a exhibited relatively strong fluorescence at 352 nm when excited at 295 nm in
hexane. In PMMA film, diarylethene 1a also showed good photochromism. In addition, the result indicated that the
compound showed a photoinduced anisotropic phenomenon accompanying the photochromic reaction, which illustrated
that the diarylethene can be potentially used as polarization multiplexed image recording medium.
A new photochromic diarylethene bearing a six-membered aryl unit, 1-(2-methyl-5-pheny-3-thienyl)-2-(2-methyl-4-
pheny-phenyl)perfluorocyclopentene (1a), was synthesized and its photochromic and fluorescent properties were
investigated. Diarylethene 1a changed the color from colorless to violet upon irradiation with 313 nm UV light, in which
absorption maxima were observed at 554 nm in hexane and at 578 nm in PMMA film, respectively. This new
photochromic system also exhibited remarkable fluorescence switching in the solid state. Finally, rewritable holographic
optical storage using 1a was performed. The results demonstrated that the compound was very sensitive responding to
633 nm recording laser, and the recorded holographic images have good contrast.
A new symmetrical photochromic diarylethene, 1,2-bis[2-methyl-5-(3-methoxylphenyl)-3-thienyl]perfluorocyclopentene (1a), was synthesized, and its photochromic properties were investigated. The compound exhibited good photochromism both in solution and in PMMA film with alternating irradiation by UV/VIS light, and the maxima absorption of its closed-ring isomer 1b are 582 and 599 nm, respectively. Using diarylethene 1b/PMMA film as recording medium and a He-Ne laser (633 nm) for recording and readout, four types of polarization and angular multiplexing holographic optical recording were performed perfectly. For different types of polarization recording including parallel linear polarization recording, parallel circular polarization recording, orthogonal linear polarization recording and orthogonal circular polarization recording,have been accomplished successfully. The results demonstrated that the orthogonal circular polarization recording is the best method for polarization holographic optical recording when this compound was used as recording material. With angular multiplexing recording technology, two high contrast holograms were recorded in the same place on the film with the dimension of 0.78 μm2.
Photochromic symmetrical diarylethenes derivatives 1a-4a bearing different long alkyl chains at 2-position of thiophene
rings have been synthesized and their photochromism and kinetics of the photochromic cyclization/cycloreversion both
in hexane and in PMMA film were investigated. The results showed that the cyclization/cycloreversion process of these
compounds were determined to be the zeroth/first order reaction, and the different long alkyl chains effects on kinetics
according to the data of reaction rates both in hexane and PMMA film.
A symmetrical photochromic diarylethene, 1,2-bis-[2-methyl-5-(2,4-fluorophenyl)-3-thienyl]perfluorocyclopentene (1a),
has been synthesized. Its photochemical properties, including photochromic behavior and fluorescent features, have been
investigated in detail. The compound showed good photochromism both in solution and in solid state. Especially, the
diarylethene exhibited a relatively strong fluorescence switches along with the photochromism from open-ring isomers to
closed-ring isomers in solid state. When irradiated by UV light, the photocyclization reaction was occurred and the
emission intensity of the diarylethene decreased significantly, due to producing the non-fluorescence closed-ring
isomers. The back irradiation by appropriate wavelength visible light regenerated its open-ring isomers and recovered the
original emission intensity. The cycles of fluorescence switching can be repeated ca. 10 times and the efficiency of
photo-switching almost keeps as same as that of original value. The results demonstrated that the diarylethene can
potential act as a system for reversible data processing using fluorescence as the detection method.
Five new photochromic unsymmetrical diarylethenes bearing different substitutes have been synthesized. Substituent
effects on their optoelectronic properties, including photochromism, fluorescence properties were investigated in detail.
The strong electron-donating substituents have effective contributions to the absorption maxima of the closed-ring
isomers and the molar coefficients, while the electron-withdrawing substituents can shift significantly the absorption
maxima of the diarylethenes to a longer wavelength and increase their cyclization quantum yield. In addition, these
diarylethenes exhibited different color (red, purple, blue and green) both in solution and in PMMA film with alternating
irradiation by UV/vis light, which can be potentially applied in the devices of full-color display.
A series of photochromic diarylethenes compounds were synthesized and the electrochemistry and electrochemistry
reaction mechanism properties were investigated. The cyclic voltammetry tests demonstrated that the colorless open-ring
isomers were assigned to the unique oxidation process, but the color closed-ring isomers of these compounds were
assigned to two oxidation processes. In addition, the electrochromism of diarylethene compound is observed in solution:
The closed-ring reaction can be triggered by electrochemical oxidation, while the open-ring reaction must be
photochemically driven. These oxidation processes properties can be useful as the oxidation processes electrochemical
switching and the oxidation electrochemical switching properties of these different diarylethene isomers can be potential
for electrochemistry data storages.
A symmetrical photochromic diarylethene, 1,2-bis[5-(3,5-difluorophenyl)-2-methyl-3-thienyl]-3,3,4,4,5,5-
hexafluorocyclopent- 1-ene (1a), was synthesized, and its photochromic and fluorescent properties were also
investigated. The results showed that this compound exhibited reversible photochromism, changing from colorless to
blue after irradiation with UV light both in solution and in PMMA amorphous film. In hexane solution, the open-ring
isomer of the diarylethene 1 exhibited relatively strong fluorescence at 350 nm when excited at 280 nm. The
fluorescence intensity decreased along with the photochromism upon irradiation with 297 nm light and its closed-ring
isomer showed almost no fluorescence. Using diarylethene 1 as recording medium, polarization holographic optical
recording was carried out successfully.
The applications of the joint transform correlator are partly limited by the information loss of the power spectra while
being detected and transmitted by conventional detectors and electrically addressed spatial light modulators. The
re-writable diarylethene films, which used to be mainly used in optical storage, are successfully tried to detect and
transmit the power spectra of the joint transform correlator instead of the CCDs and the electrically addressed spatial
light modulators. According to the experiment results and the corresponding comparisons and discussions, the
re-writable diarylethene films can be used to detect and transmit the power spectra of the joint transform correlator
better than the CCDs and the electrically addressed spatial light modulators in the case of decreasing the information
loss. With high resolution and large dynamic range, besides optical storage, the re-writable diarylethene films will be
widely used in optically addressed spatial light modulators if the operation period can be shortened remarkably.
A new unsymmetrical photochromic diarylethene 1a is synthesized, and the photochromic properties of it are also investigated. The compound exhibits good photochromism with UV/visible light irradiation. Compound 1a in polymethyl methacrylate (PMMA) film changes color upon 313-nm light irradiation from colorless to blue, in which the absorption maximum is observed at 587 nm. Photon-mode polarization multiplexing holographic optical recording is performed successfully using this compound as a recording medium. In the diarylethene 1b/PMMA film, polarization multiplexing hologram recording and retrieval, and a combination with the angular multiplexing scheme, are demonstrated systematically. The results indicate that recording capacity can be significantly improved with the combined method of polarization and angular multiplexing holographic recording.
We have carried out successfully two-wavelength photon-mode optical storage using photochromic diarylethene
materials, 1,2-bis(2-methyl-5-(2-(1,3-dioxolane))-thien-3-yl)perfluorocyclopentene (1a) and 1,2-bis(2-methyl-5-(2,2'-
dicyano-vinyl)-thien-3-yl)perfluorocyclopentene (2a), as recording medium. Two laser beams of 532 and 780 nm were
used in recording and readout simultaneously, and signals with high S/N ratio were obtained. The results showed that the
two diarylethenes had responded rapidly upon irradiation of the corresponding wavelength laser. The destruction of the
readout and the photochromic properties of the two diarylethenes in PMMA film were also investigated.
A unsymmetrical photochromic diarylethene, 1-(2-methyl-5-phenylthien-3-yl)-2-[2-methyl-5-(3-fluorophenyl)thien- 3-
yl]perfluorocyclopentene (1a), was synthesized and its structure was determined by single-crystal X-ray diffraction
analysis. The compound showed good photochromism in solution, in PMMA amorphous film and in the singlecrystalline
phase upon photo-irradiation. Using the diarylethene 1b/PMMA film as recording medium and a nonpolarized
He-Ne laser (633 nm, 4 mW) for recording and readout, three types of polarization holographic optical
recording were carried out successfully. The results showed that different patterns can be displayed with differently
polarized readout lights, which can be applied in camouflage technology.
Two new photochromic diarylethene compounds, {[1-(2-methyl-5-(4-(2-(1,3-dioxolane))phenyl)),2-(2-methyl-5-(p-methylphenyl))]thien-3-yl}perfluorocyclopentene (1a) and {[1-(2-methyl-5-(4-(2-(1,3-dioxolane))phenyl)),2-(2-methyl-5-(4-formyl- phenyl))]thien-3-yl}perfluorocyclopentene (2a), were synthesized. Their spectra properties, such as UV-Vis absorption spectra, fluorescence and kinetics properties in solution were also investigated. Diarylethene 1a shows relatively strong fluorescence at 353 nm when excited at 295 nm, and 2a shows no fluorescence under the same experimental condition. The cyclization/cycloreversion processes of the two diarylethenes were determined to be zeroth/first order reaction, respectively. In addition, photo-mode multi-step optical storage using 2a as recording medium was performed successfully.
A diarylethene derivative, 1,2-bis[2-methyl-5-(3-fluorophenyl)-3-thienyl] perfluorocylcopentene, is synthesized and dispersed into PMMA to prepare a polymeric film. The film shows good color recycling between switching of irradiation of UV light and red light. Under the excitation of linear polarized light, an apparent characteristic of photoinduced anisotropy is observed in the diarylethene/PMMA film, which implies polarization modulation gratings can be recorded in this holographic medium apart from recording of intensity modulation gratings. We experimentally make a comparison among four types of polorization holograms recording for their reconstruction images, which shows that the orthogonal circular polarization hologram has both high signal-to-noise ratio and high diffraction efficiency. Based on the polarization gratings scheme, we demonstrate the polarization multiplexing holograms reocording and retrieval in the diarylethene/PMMA film and the combination with the angular multiplexing scheme.
The photochromic diarylethene, 1, 2-bis(2-methyl-5-(3-trifluorophenyl)-3-thienyl)perfluorocyclopentene (BMTTP), was synthesized. This compound undergoes a photochromic reaction either in solution, PMMA amorphous film or in the single crystalline phase. Using this compound as recording medium, two-photon optical bit pattern storage was performed successfully by a femtosecond laser and a reflection confocal scanning-fluorescence microscope.
A photochromic diarylethene 1,2-bis(2-methyl-5-(2,2'-dicyanovinyl)- thien-3-yl)perfluorocyclopentene (1a) was synthesized. Its photochromic properties in different solution and PMMA film were investigated. While, fluorescence properties in different solution has also been discussed. The results of the research demonstrate that it has shown good photochromic behavior and relatively strong fluorescence in different solution at room temperature. At last, the dynamics of photochromic ring-opening and ring-closure reaction in different solvent was also elucidated. The result indicated that its cyclization/cycloreversion process was determined to be zeroth/first order reaction in different solution, respectively.
Two novel photochromic dithienylethenes, [1-(2-methyl-5-p- methylphenyl-thien-3-yl)-2-(2-methyl-5(4-(1,3-dioxolane) phenyl)- thien-3-yl)]perfluorocyclopentene (DTE-1) and [1-(2-methyl-5-(3- thienyl)-thien-3-yl)-2-(2-methyl-5(4-(1,3- dioxolane)phenyl)-thien-3-yl)]perfluorocyclopentene (DTE-2), were synthesized and their photochemical properties, such as photochromism and fluorescence were investigated. DTE-1 and DTE-2 have shown good photochromic behavior. Upon irradiation with 254 nm UV light, their color changed from colorless to blue, in which absorption maxima were observed at 590 nm and 592 nm in CH2Cl2. DTE-1 and DTE-2 also showed relatively strong fluorescence in different solvents when excited at 295 nm. While, their fluorescence spectra showed remarkable concentration dependence. In addition, near-field recording using DTE-1 as recording medium was performed successfully.
A novel photochromic dithienylethene, [1-(2-methyl-5-formyl-3-thienyl)-2-(2-methyl-5-naphthyl-3-thienyl)]perfluoro- cyclopentene (1a), was synthesized and its photochemical properties, such as photochromism in solution as well as in poly-methylmethacrylate (PMMA) amorphous film, fluorescence were investigated in detail. Dithienylethene 1a has shown good photochromic behavior both in solution and in PMMA film. Upon irradiation with 254 nm UV light, its color changed from colorless to blue, in which absorption maxima were observed at 584 nm in hexane and 596 nm in PMMA film. 1a also showed relatively strong fluorescence in different solvents when excited at 292 nm. In addition, photon-mode holographic optical storage using dithienylethene 1b as recording medium was performed successfully.
Five diarylethenes which have similar absorption spectra were chosen as recording media and their writing/readout characteristics were investigated in photon-mode optical storage. Writing power and the recording laser wavelength were the main factors influencing writing time. The experimental results showed that the writing time decreased rapidly with the increases of writing power (P), and the destruction of the readout had a remarkable difference when recording on the left side of the their maxima absorption with a 532 nm laser and recording on the right side with a 650 nm laser. The readout destruction of recording at the left side was much smaller than that of recording at the right side.
Two novel photochromic diarylethenes, 1,2-bis-[2-methyl-5-(4-formylphenyl)-3-thienyl]perfluorocyclopentene (1a) and 1,2-bis[2-methyl-5-(p-fluorophenyl)-3-thienyl]perfluorocyclopentene (2a), were synthesized and their photochromism and dynamics of the ring opening and closure reaction both in solution and in PMMA film were investigated. The results showed that 1a and 2a changed the color from colorless to blue upon irradiation with 313 nm UV light, in which absorption maxima were observed at 600 and 572 nm in hexane and at 612 and 588 nm in PMMA film, respectively. Their cyclization/cycloreversion processes were zeroth and first order reaction both in solution and in PMMA film, respectively.
A novel asymmetric photochromic compound [1-(2-methyl-5-formyl-3-thienyl)-2-(2-methyl-5-phenyl-3-thienyl)]
perfluorocyclopentene (1a) was synthesized and its photochromic and electrochemical properties were investigated.
Dithienylethene 1a changed the color from colorless to blue upon irradiation with 254 nm UV light in hexane solution
and in PMMA, in which absorption maxima were observed at 590 nm and 604 nm, respectively. Electrochemical
reduction of 1a results in the blue ring-closed (1b) by cyclic voltammetry test.
The photochromic diarylethene, 1,2-bis(2-methyl-5-methylene-n-butylamido-thien-3-yl)perfluorocyclopentene (BMMBTP), was synthesized and its photochromic and fluorescence properties was investigated. This compound underwent a photochromic reaction both in solution and in PMMA amorphous film. Using diarylethene-PMMA amorphous film as memory medium, we firstly performed successfully two-photon 3D optical storage.
Using photochromic diarylethenes as recording media, we performed successfully three-wavelength photon-mode optical storage. Three laser beams of 532, 650 and 780 nm were used in recording and readout simultaneously, and signals with high S/N ratio and no crosstalk were obtained.
The diarylethene may undergo photochemical ring-closing reaction and both photochemical and electrochemical ring-opening reaction. Irradiation of the open form with UV light results in essentially quantitative photocyclization to the deeply colored form. The dithienylcyclopentene derivative in their ring-closed forms can undergo ring-opening upon electrochemical oxidation.
In this paper, diarylethene derivative, 1,2-bis(2-methyl-5-N,N-dimethylaminophenyl)-thien-3-yl) perfluorocyclopentene (BMDTP) was synthesized. And the PMMA film of 10μm thickness of BMDTP was fabricated by spin-coating method. The maximal UV-Visible absorption of amorphous PMMA film is 634nm. And the reflective index modulation(Δn) is 2.14×10-3 between the open- and close-rings form. On the PMMA film, ten gratings of hologram are recorded in one volume by angle multiplexing. Therefore, the diarylethene is a promising material for rewritable volume holographic optical storage.
Four novel photochromic dithienylethenes compounds, 1,2-bis[2-methyl-5(p-fluorophenyl)-3-thienyl]perfluorocyclo-pentene (1a), 1,2-bis[2-methyl-5(p-ethoxyphenyl)-3-thienyl]perfluorocyclopentene (2a), 1,2-bis[2-methyl-5(p-N,N-dimethylaminophenyl)-3-thienyl]perfluorocyclopentene (3a) and 1,2-bis(2-methyl-5-naphthalene-3-thienyl)perfluorocyclopentene (4a) were synthesized. Their optoelectronic properties, such as photochromism in solution as well as in PMMA amorphous, fluorescence and electrochemistry properties were systematically investigated. These dithienylethenes have shown good photochromic behavior both in solution and in PMMA amorphous film. All of them exhibited relatively strong fluorescence. With the increase of their concentration in a THF solution, their fluorescence spectra showed a bathochromic shift. The irreversible anodic oxidation of 1a, 3a and 4a occurred when performing cyclic voltammetry tests. Moreover, dithienylethene 1a showed remarkable multi-color electrochromic properties during the anodic polarization. In addition, photo-mode multi-step optical storage using 2a and 3a as recording medium was performed successfully.
The novel photochromism, diarylethene derivatives, 1,2-bis(2,5-dimethyl-thien-3-yl)perfluoro cyclopentene (1a) and 1,2-bis(2-methyl-5-carbonylphenyl)-thien-3-yl) perfluorocyclo pentene(2a) were synthesized. And the PC discs of these two diarylethenes were prepared by spin-coating and vacuum evaporating method. To some extent, the high density recording was carried out the multi-wavelength and multi-level optical storage system. On the PC disc, single-wavelength and eight-level recording was realized by 2a, and two laser beams of 532nm and 650nm were used in two-wavelength eight-level recording and readout simultaneously. The results show that the reflectivity differences between the recording region and unrecording region is greater than 50%. The creation is that the two-wavelength and four-step optical recording on the PC disc achieved first time.
Although recordable disk are rapidly developing, the mainstream in the market is still the read-only manufactures such as CD-ROM and DVD-ROM which have prerecorded information. How to enhance the storage density of read only memory is one of the hotspots in optical data storage. The authors put forward novel theory for read only memory. The novel theory takes little organic molecule as memory medium of read only memory, and the writing process is photon-mode, which is called organic photonic read only memory (OP-ROM). According to the novel theory, disks can be massively copied by exposure. Furthermore, because of diversity and modifiability of organic molecules, the storage density can be improved by multi-wavelength, multi-level and multi-layer.
{[1-(2-methyl-5-(4-N,N-dimethylphenyl)),2-(2-methyl-5-(2-(1,3-dioxoane)))]-thien-3-yl}perfluorocyclopentene (1a) and {[1-(2-methyl-5-formyl),2-(2-methyl-5-(2,2'-dicyanovinyl))]-thien-3-yl}perfluorocyclopentene(2a) were synthesized and rewritable photo-mode optical recording by the use of them were performed. The results showed that both of the two diarylethenes are very sensitive responsing to the corresponding wavelength recording laser, and the readout signals with high S/N ratio which was up to 30 to approximately 50% were obtained. The destruction of the readout and the photochromic properties of these diarylethenes in hexane solution and PMMA films were also discussed.
Four photochromic diarylethenes with different spectra in open and closed form were synthesized simultaneously. Irradiation of the open form with UV light results in essentially quantitative photocyclization to the closed form. The compounds show attractive optical properties and are expected to be used in optical storage and photoswitch.
Two non-symmetric perfluorocyclopentene derivatives have been synthesized. The absorption bands of their closed forms are located at 400 to approximately 500 nm wavelength regions. They undergo thermally irreversible photochromic reaction and fatigue resistant. The closed-ring form remains thermally stable after several months. And the repeatable cycle number in hexane is more than 103 times in the presence of air. It demonstrates that they are promising candidates for short wavelength recording.
Current applied optical storage technologies are all based on the heat effect of the recording laser, i.e., heat-mode optical storage. In the present work, photon-mode optical storage using photochromic diarylethene materials was investigated. Two diarylethene molecules dispersed into PMMA together was used as storage material. The recording layer was spin-coated on a glass substrate with Al reflective layer. Two laser beams of 532 nm and 650 nm were used in recording and readout by simultaneously writing and reading, and the reading lasers detected signals with high S/N ratio. Multi-wavelength storage was realized with the diarylethene PMMA film.
1,2-bis(2-methyl-5-(2-(1,3-dioxolane))-thien-3-yl)perfluorocyclopentene (1a) and 1,2-bis(2-methyl-5- 4-N,N-dimethyl-phenyl)-thien-3-yl)perfluorocyclopentene (2a) were synthesized and rewritable photo-mode muti-wavelength optical recording by the use of them was performed successfully. In amorphous film photochromic media, two laser beams of 532 nm and 650 nm were used in recording and readout simultaneously, and signals with high S/N ratio were detected. The results show that the reflectivity difference between the recorded dot and unrecorded region is greater than 50%, and above all, there is no crosstalk existing in the two diarylethenes, which it is very important to implement successfully multi-wavelength optical recording. The photochromic properties of them were also discussed.
Photon-mode recording of photochromic materials is regarded as a promising storage system, which has various advantages over the traditional heat-mode recording in terms of its data capacity and data-recording rate. Diarylethenes show good thermal stability and remarkable fatigue resistance, and these properties are indispensable for the applications to optical storage materials. In present work, several diarylethene compounds were synthesized, and a series of optical storage tests were carried out on the sample discs with diarylethenes as the recording materials. The recording based on these photochromic materials was photon-type,and the recorded regions appeared as faded dots. 780, 650 and 532 nm lasers were used for writing on the corresponding discs, and the recorded information were readout by the same lasers respectively. A two-wavelength optical storage was realized on a mixed diarylethene recording layer by two laser beams of 532 nm and 650 nm synchronously. A higher data capacity can thus be expected to reach by using a multi-wavelength optical storage like that. Although the diarylethenes satisfy the minimum demands of optical storage systems, these molecules have one unsolved drawback: the lack of a non-destructive capability. In this work, Electric-locked properties were investigated in a BT3FP-OH thin film; the electric trigger could prevent the photochromic reactions, which provided a practicable non-destructive readout method. Three kinds of diarylethene derivatives linked by solvatochromic dye units wer fabricated; the theoretical investigation showed that reading at the wavelength of about 650-750 nm would destroy the recorded information no longer. Thus a non-destructive method could be constructed on these diarylethene molecules.
Two asymmetric photochromic diarylethenes with different spectra in open and closed form were synthesized simultaneously. Irradiation of the open form with UV light results in essentially quantitative photocyclization to the deeply colored form. The compounds show attractive optical properties and are expected to be used in optical storage and photoswitch.
A diarylethene derivative with thermally irreversible photochromic reactivity and good fatigue resistance has been synthesized. The two-photon-induced fluorescence of the compound is observed by excited with 800 nm beam. The intensity of the fluorescence is found to be proportional to I1.748, where I is the incident laser intensity, and decays with the increase of irradiation time. The results show that two-photon induced nonlinear photochromic reaction was partially realized. It demonstrates that the compound is a promising candidate for two-photon 3D optical data storage.
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