Optics Express 2006-08-21

Contrast and efficiency enhancement in organic light-emitting devices utilizing high absorption and high charge mobility organic layers.

W F Xie, Y Zhao, C N Li, S Y Liu

Index: Opt. Express 14 , 7954 - 7959, (2006)

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Abstract

Organic light-emitting devices utilizing copper phthalocyanine (CuPc) and C(60) as the hole- and electron-injection layers were reported. Compared with a conventional device without CuPc and C(60) layers, the improvement of the contrast is more than 100% under 140-lx ambient lighting at a brightness of 300 cd/m(2). A maximum current efficiency of 3.93 cd/A, which is higher than 3.62 cd/A for a conventional device, was obtained at 9 V. The device has a maximum luminance of 17170 cd/m(2) at 15 V. The high contrast and high efficiency of the device are attributed to the high absorption and high charge mobility of CuPc and C(60) films.