Different configurations of phosphorescent yellow emissive layer in white organic light-emitting device

Shengqiang Liu; Junsheng Yu; Juan Zhao; Yadong Jiang; Zhu Ma

doi:10.1117/12.977839

15 October 2012 Different configurations of phosphorescent yellow emissive layer in white organic light-emitting device

Shengqiang Liu, Junsheng Yu, Juan Zhao, Yadong Jiang, Zhu Ma

Proceedings Volume 8419, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing, Imaging, and Solar Energy; 84191U (2012) https://doi.org/10.1117/12.977839
Event: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), 2012, Xiamen, China

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.

Citation Download Citation

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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