23 September 2016 Blue phosphorescent OLEDs with 34.1% external quantum efficiency using a low refractive index electron transporting material
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Abstract
In this study, we demonstrate a blue OLED with the EQE of 34% and power efficiency of 79.6 lm W-1 using low refractive index electron transporting layer which are the highest efficiencies ever reported in blue OLEDs. In addition, we quantitatively calculated maximum achievable outcoupling efficiencies according to change of refractive indices, which can be used to estimate the achievable outcoupling efficiency of OLEDs without fabrication. The simulation indicates that EQE over 60% can be achievable in PhOLEDs if refractive indices of consisting organic materials’ are close to 1.5.
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Hyun Shin, Hyun Shin, Jeong-Hwan Lee, Jeong-Hwan Lee, Chang-Ki Moon, Chang-Ki Moon, Jin-Suk Huh, Jin-Suk Huh, Bomi Sim, Bomi Sim, Jang-Joo Kim, Jang-Joo Kim, "Blue phosphorescent OLEDs with 34.1% external quantum efficiency using a low refractive index electron transporting material", Proc. SPIE 9941, Organic Light Emitting Materials and Devices XX, 99411X (23 September 2016); doi: 10.1117/12.2236763; https://doi.org/10.1117/12.2236763
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