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Research was conducted to examine the electroluminescence (EL) performance of organic light emitting diodes (OLEDs) with a thick doped hole transport layer (DHTL). The basic cell structure is an anode/DHTL/HTL/emitter layer/cathode. Results indicate that the combination of a hole transport polycarbonate polymer and a tris (4-bromophenyl) amiium hexachroloantimonate as a dopant can form thick DHTL with yield an excellent EL performance. The EL characteristics of doped OLEDs are presented.

The electroluminescent characteristics of single-layer organic light emitting diodes (SOLEDs) were examined using SOLED devices composed of an inert polymer in which emissive electron transport molecules, hole transport molecules and highly fluorescent dopants as luminescent centers are scattered. Two dopants, namely, rubrene and coumarin, were investigated. Results show that the two dopants differ in charge carrier recombination and emission mechanisms.

Second-harmonic generation in a uniaxial crystal in total-reflection geometry is precisely measured. A Y-cut plate and a Z-cut plate of quartz crystals were used as samples. The incident wave is totally reflected by a glass prism in contact with the sample crystal, and an evanescent wave penetrates into the sample as a fundamental wave. The results gave the quantitative values of the components for a nonlinear optical susceptibility tensor with various polarizations and with Y-cut and Z-cut quartz plates. This technique can be applied to various samples to evaluate their nonlinear optical efficiencies.

The various thermal treatment effects exhibited on the N-alkyl perylene diimide thin-film transistors (TFTs) with different alkyl chain are discussed. These effects are shown to be highly dependent on the substituted alkyl chain length.

A distributed feedback (DFB) resonator composed of gold (Au) nanoparticles is used to find a tunable lasing action of dye-doped glass films. Photoreduction of chloroauric ions doped in silica/titania (SiO2/TiO2) sol-gel films are used to fabricate the Au-DFB resonators having various periodic spacings of 400-600 nm.

The electroluminescence (EL) response of organic light-emitting diodes (OLEDS) with different metal cathodes and device-area dependence was investigated. Electron mobility in the bilayer showed mixed mobility features for each layer.

The x-ray methodology, diffracted x-ray tracking, is proposed in order to directly observe the behavior of single molecules in real time and space. A well-defined diffracted x-ray spots from Mo/Si nanocrystals in real time is monitored.