Control of Heat Temperature in Light Emitting Diodes with Thermoelectric Device

Temperature-dependent photoluminescence in light-emitting diodes

Temperature-dependent photoluminescence (TDPL), one of the most effective and powerful optical characterisation methods, is widely used to investigate carrier transport and localized states in semiconductor materials. Resonant excitation and non-resonant excitation are the two primary methods of researching this issue. In this study, the application ranges of the different excitation modes are ...

Temperature-dependent recombination in polymer composite light-emitting diodes

We study the temperature dependence of the current–voltage and radiance–voltage curves in double-carrier injected polymer light-emitting devices comprised of poly~2-methoxy,5~28-ethyl-hexoxy!– p-phenylene vinylene) ~MEH–PPV! and MEH–PPV/SiO2 as the active layer. The quantum efficiency increases significantly as the temperature is decreased in agreement with an increase in the recombination effi...

Device Structures and Materials for Organic Light Emitting Diodes

Organic light emitting devices (OLEDs) are promising candidates for light-weight color flat panel displays. Different device structures with emission in the blue, green, and red spectral region are discussed with respect to their optical and electrical characteristics. Blue OLEDs based on OXD-8 as emitter molecule show quantum efficiencies of 0.9 % (2.2 cd/A, 0.6 lm/W), green emitting devices b...

Light-emitting silicon pn diodes

We report on the electrical and optical characteristics of silicon light-emitting pn diodes. The diodes are prepared by ion implantation of boron at high doses and subsequent hightemperature annealing. Under forward bias, the diodes emit infrared electroluminescence closely below the band gap of bulk Si. We present a rate-equation model for bound excitons, free excitons and free carriers which ...

ZnO - Based Light - Emitting Diodes