8 October 2014 The application of high efficient yellow phosphorescent material to white OLEDs
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A new type of thiopyridinyl-based iridium molecule (POT) was used as the yellow phosphorescent material in our research. On fabricating a yellow PHOLED by doping POT-02 with host as the emitter, the device achieved a high power efficiency of 66.0 lm/W and an external quantum efficiency of 23.2%. On the other hand, a white organic lightemitting diode (WOLED) with a high power efficiency has been demonstrated by dispersing a host-free, yellow phosphorescent material in-between double blue phosphorescent emitters. In this study, we introduce a simple process for generating yellow emission of a WOLED by using the B/Y/B EML configuration. The B/Y/B EML configuration can achieve a higher efficiency and a smaller color shift with various operational brightness values. Based on the concept of this device, the molecular engineering of the blue phosphorescent host material as well as the light-extraction film, a WOLED with a power efficiency of 103 lm/W and an external quantum efficiency of 38.2% at a practical brightness of 1000 cd/m2 with CIE coordinates (CIEx, y) of (0.36, 0.48) can be achieved.
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Jin-Sheng Lin, Jin-Sheng Lin, Chun-Neng Ku, Chun-Neng Ku, Pang-Chi Huang, Pang-Chi Huang, Cheng-An Wu, Cheng-An Wu, Meng-Hao Chang, Meng-Hao Chang, Jia-Lun Liou, Jia-Lun Liou, Mei-Rurng Tseng, Mei-Rurng Tseng, "The application of high efficient yellow phosphorescent material to white OLEDs", Proc. SPIE 9183, Organic Light Emitting Materials and Devices XVIII, 91831O (8 October 2014); doi: 10.1117/12.2060344; https://doi.org/10.1117/12.2060344

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