Chin, Byung Doo Lee, Soo-Hyeong Kim, Jai Kyeong Lee, Chang Hee 2024-01-19T14:07:47Z 2024-01-19T14:07:47Z 2022-03-07 2006 0277-786X https://pubs.kist.re.kr/handle/201004/116732 In this paper, we demonstrated that controlled charge trapping, both at the emission layer and charge transport layer with energy level alignment, is essential for charge-balanced and effective electrophosphorescent organic light-emitting device (OLED). Conditions for enhanced of efficiency and lifetime of OLED were obtained with graded doping profile at the light-emission layers (varied host-dopant concentration) and different hole (exciton) blocking materials. Conceptual device physics presented in this study can be applied at an initial design of charge-confined, balanced structure of highly efficient electrophosphorescent devices. English SPIE-INT SOC OPTICAL ENGINEERING Role of carrier mobility, exciton diffusion, and their interplay for charge balance and improved properties of organic electrophosphorescent device Conference 10.1117/12.680411 1 Conference on Organic Light Emitting Materials and Devices X, v.6333 Conference on Organic Light Emitting Materials and Devices X 6333 US San Diego, CA 2006-08-13 ORGANIC LIGHT EMITTING MATERIALS AND DEVICES X 000244386400025 2-s2.0-33846968491 Proceedings Paper