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15 October 2012 Different configurations of phosphorescent yellow emissive layer in white organic light-emitting device
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Abstract
We fabricated white organic light-emitting devices (WOLEDs) based on three different configurations for yellow emissive layer (Y-EML), using phosphorescent yellow bis[2-(4-tert-butylphenyl)benzothiazolato-N,C2’]iridium (acetylacetonate) [(t-bt)2Ir(acac)]. The Y-EML was formed as undoped ultrathin layer, doped ultrathin layer with low (tbt) 2Ir(acac) concentration and doped thin layer with the same amount of (t-bt)2Ir(acac) molecular as the undoped YEML. The results showed that the difference in configurations of the Y-EML affected not only the operating voltage but also the luminance and efficiency characteristics of the devices. Comparing device performance, it was found that devices based on the doped Y-EML showed low efficiency and yellow-dominated light emission, due to triplet exciton hopping caused by different triplet energy. On the other hand, a device with the undoped Y-EML demonstrated the highest efficiency (79.0 cd/A at 1 550 cd/m2 and 40.5 lm/W at 1 000 cd/m2), attributing to well confined charge carriers and excitons.
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Shengqiang Liu, Junsheng Yu, Juan Zhao, Yadong Jiang, and Zhu Ma "Different configurations of phosphorescent yellow emissive layer in white organic light-emitting device", Proc. SPIE 8419, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing, Imaging, and Solar Energy, 84191U (15 October 2012); https://doi.org/10.1117/12.977839
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