We present an enhancement scheme for optical extraction from Organic based LEDs (OLEDs). Enhancement layers, developed by Mitsubishi Chemical Corporation, facilitate the engineering of scattering near an OLED's emitter. An approximate scattering model based on rigorous optical field calculations of the OLED structure is described and optimised. Experimental and numerical results indicate that up to 2-fold efficiency enhancements are achievable across a broad spectral range.
An organic field effect transistor (FET) device based on a solution-processible tetrabenzoporphyrin (BP) has been developed. BP is derived from its precursor that is soluble in some organic solvents and gives an amorphous film of high quality by spin coating. A polycrystalline film of BP is obtained by thermal conversion of the precursor at about 200 degree C. The FET characteristics are found to largely depend on the purity, device structure, and fabrication process. The device performance was: mobility of 1.7 X 10-2 cm2/Vs and on/off ratio of 105. We have also analyzed the crystal structure of BP and characterized its electronic and morphological properties.
We propose a novel type of chromophore, naphthoquinone methide dyes, for nonlinear optics used in the near IR wavelength. The large resonance effect and the small intermolecular interaction allows the chromophore to show a large Pockels coefficient at 1.3 micrometers when it is poled in a polymer matrix. The origin of the nonlinearity is discussed by measuring the ground state dipole moment and the change in dipole moment between the ground and excited states. The polyurethane to which this dye was chemically attached was synthesized and the large nonlinearity was demonstrated. In polymer films, propagation loss at 1.3 micrometers increases maybe due to the aggregation of chromophores.
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