Extracting light from polymer light-emitting diodes using stamped Bragg gratings

被引：143

作者：

Ziebarth, JM ^{[1
]}

Saafir, AK

Fan, S

McGehee, MD

机构：

[1] Stanford Univ, Geballe Lab Adv Mat, Stanford, CA 94305 USA

[2] Stanford Univ, Dept Elect Engn, Stanford, CA 94305 USA

来源：

ADVANCED FUNCTIONAL MATERIALS | 2004年 / 14卷 / 05期

关键词：

D O I：

10.1002/adfm.200305070

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In this paper, we describe a method for increasing the external efficiency of polymer light-emitting diodes (LEDs) by coupling out waveguided light with Bragg gratings. We numerically model the waveguide modes in a typical LED structure and demonstrate how optimizing layer thicknesses and reducing waveguide absorption can enhance the grating outcoupling. The gratings were created by a soft-lithography technique that minimizes changes to the conventional LED structure. Using one-dimensional and two-dimensional gratings, we were able to increase the forward-directed emission by 47% and 70%, respectively, and the external quantum efficiency by 15% and 25%.

引用

页码：451 / 456

页数：6

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