Mr. Kunping Guo Profile

Kunping Guo

at Shanghai Univ

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Proceedings Article | 18 December 2014 Paper

Three-peak standard white organic light-emitting devices for solid-state lighting

Kunping Guo, Bin Wei

Proceedings Volume 9295, 929516 (2014) https://doi.org/10.1117/12.2070805

KEYWORDS: Organic light emitting diodes, Light sources and illumination, External quantum efficiency, Electroluminescence, Doping, Aluminum, Quantum efficiency, Solid state lighting, Excitons, Cerium

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Standard white organic light-emitting device (OLED) lighting provides a warm and comfortable atmosphere and shows mild effect on melatonin suppression. A high-efficiency red OLED employing phosphorescent dopant has been investigated. The device generates saturated red emission with Commission Internationale de l’Eclairage (CIE) coordinates of (0.66, 0.34), characterized by a low driving voltage of 3.5 V and high external quantum efficiency of 20.1% at 130 cd m^-2. In addition, we have demonstrated a two-peak cold white OLED by combining with a pure blue emitter with the electroluminescent emission of 464 nm, 6, 12-bis{[N-(3,4-dimethylpheyl)-N-(2,4,5-trimethylphenyl)]} chrysene (BmPAC). It was found that the man-made lighting device capable of yielding a relatively stable color emission within the luminance range of 1000-5000 cd m^-2. And the chromaticity coordinates, varying from (0.25, 0.21) to (0.23, 0.21). Furthermore, an ultrathin layer of green-light-emitting tris (2-phenylpyridinato)iridium(Ⅲ) Ir(ppy)3 in the host material was introduced to the emissive region for compensating light. By appropriately controlling the layer thickness, the white light OLED achieved good performance of 1280 cd m^-2 at 5.0 V and 5150 cd m-2 at 7.0 V, respectively. The CIE coordinates of the emitted light are quite stable at current densities from 759 cd m^-2 to 5150 cd m^-2, ranging from (0.34, 0.37) to (0.33, 0.33).

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