Mr. Raivis Silis Profile

Raivis Silis

at Institute of Solid State Physics

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Proceedings Article | 30 May 2022 Presentation

Investigations of spontaneous and stimulated emission properties of original glass-forming pyranyliden derivatives in thin films with and without silver nanoparticles

Aivars Vembris, Patricija Pailsone, Raivis Silis, Jelena Mikelsone, Elmars Zarins, Valdis Kokars

Proceedings Volume PC12149, PC121490X (2022) https://doi.org/10.1117/12.2622037

KEYWORDS: Nanoparticles, Thin films, Silver, Luminescence, Nd:YAG lasers, Absorption, Spectroscopy, Solid state lasers, Quantum efficiency, Metals

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Organic solids can be used as emitters in organic solid-state lasers. As one of the most popular red light-emitting organic laser dyes is DCM that has been widely used in a dye laser. It has been used in solid-state lasers. The active material was host-guest systems where DCM was doped at low concentration due to large intermolecular interactions. We previously developed original glass-forming DCM derivatives were attached bulky triphenyl groups reduced intermolecular interaction thus it was possible to observe amplified spontaneous emission (ASE) in the neat films. In this work, we are presenting new derivatives with modified electron acceptor and donor groups. The investigated compounds are pyranyliden derivatives with malononitrile and 1H-indene-1,3(2H)-dione as acceptor and bis(5,5,5-triphenylpentyl)amino- and 5,5,5-triphenylpentyl-piperazin-1-yl- as donor. Photoluminescence and ASE were investigated in thin films. All compounds emit light in red spectral regain with the photoluminescence quantum yield of up to 6%. Amplified spontaneous emission excitation threshold energy was about 100 μJ/cm2. Silver nanoparticles were used to increase the performance of the compounds. Triangular nanoparticles with the surface plasmon resonance (SPR) overlapping the absorption and emission spectra of compounds were used. Metal nanoparticles were dissolved in the organic solution with investigated compounds. The solution was ultrasonicated prior to deposition on a glass substrate by the spin-coating method. SPR enhance the absorption and emission of the investigated compounds. Accordingly, it was observed as at least two times increase in the PLQY of mixed thin films and more than two times were decreased excitation threshold energy of ASE. More detailed results and metal nanoparticle influence on emission properties of investigated compounds will be discussed.

Proceedings Article | 24 May 2022 Poster + Paper

Amplification of organic semiconductor luminescence in thin films with silver nanoparticles

Raivis Silis, Jelena Mikelsone, Aivars Vembris

Proceedings Volume 12131, 121310V (2022) https://doi.org/10.1117/12.2621545

KEYWORDS: Nanoparticles, Silver, Thin films, Quantum efficiency, Polymethylmethacrylate, Luminescence, Surface plasmons, Absorption, Yield improvement, Ultrasonics

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The luminescence of organic semiconductors can be enhanced by surface plasmon resonance on metal nanoparticles, so it can pave the way for the development of light modulators, laboratory chips or sensors based on organic semiconductors. Silver nanoprisms and nanospheres are two-dimensional plasmonic nanostructures that have attracted massive attention due to their strong shape-dependent related applications and optical properties. When the lateral dimension of silver nanoplates is much larger than the thickness, they possess a very great degree of anisotropy, which favors a high tunability of their localized surface plasmon resonance and maximum electromagnetic-field enhancement therefore is generated. Within this work, silver nanoparticles (nanoprisms and nanospheres) of different sizes were obtained in aqueous solution, which were stabilized with sodium citrate and PVP (Polyvinipyrrolidone). Most luminophores are insoluble in water, so nanoparticles had to be transferred to the organic environment. This was achieved using the ultrasonic method. The obtained nanoparticle solutions were added to organic luminophore DWK-1-TB solution. Before nanoparticles were applied to thin films together with organic luminophore (DWK-1-TB), their properties (absorption, quantum yield, excitation, emission) were studied. Thin films were coated from these solutions. Thin films were applied by spin coating and blade casting method. Different concentrations of silver nanoparticles solutions were coated, as well as films of different thickness. PMMA (polymethyl methacrylate) was added because the nanoparticles efficiently transfer into the PMMA solution and its presence at low concentrations improves the homogeneity of the thin film. Quantum yield, change in luminescence depending on the type of nanoparticles, as well as film thickness were studied in the obtained samples.

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