High-efficiency orange and white phosphorescent organic light-emitting diodes based on homojunction structure

• DOI: 10.1016/j.orgel.2017.02.019
• Publication Date: 2017-02-17T10:31:47Z
• Authors: Bingye Chen; Liangmei Zuo; Asu Li; Ren Sheng; Yu Duan; Yi Zhao; Ping Chen
• Keywords: Homojunction

Abstract We demonstrate high-efficiency orange and white phosphorescent organic light-emitting diodes based on homojunction structure. Excellent performance is realized by using step-graded p- and n-type doping structure in orange homojunction device. The resulting orange homojunction device exhibits a maximum current efficiency of 30.0 cd/A and low efficiency roll-off. The improvements are mainly attributed to the utilization of step-graded doped profile, which facilitates balanced charge carrier injection and transport. Moreover, one optimized white homojunction device based on two complementary colors shows a maximum efficiency of 15.4 cd/A, and superior color-stability in a wide range of luminance.