Saturated and efficient blue phosphorescent organic light emitting devices with Lambertian angular emission

被引：51

作者：

Mulder, C. L.

Celebi, K.

Milaninia, K. M.

Baldo, M. A.

机构：

[1] MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

[2] MIT, Dept Phys, Cambridge, MA 02139 USA

[3] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

来源：

APPLIED PHYSICS LETTERS | 2007年 / 90卷 / 21期

关键词：

D O I：

10.1063/1.2742577

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The authors employ a microcavity to optimize the color of a phosphorescent organic light emitting device (OLED) based on the-sky blue phosphor FIrpic. The output of the OLED is filtered by scattering media to correct the angular emission intensity profile and eliminate the angular dependence of the color. With a holographic diffuser as the scattering medium, the microcavity OLED achieves an external quantum efficiency of (5.5 +/- 0.6)%, as compared to (3.8 +/- 0.4)% for a conventional structure. The color coordinates of the microcavity OLED with holographic diffuser are (x,y)=(0.116 +/- 0.004,0.136 +/- 0.010) with minimal angular color shift and a nearly ideal Lambertian angular emission profile. (c) 2007 American Institute of Physics.

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