Enhanced luminance efficiency of organic light-emitting diodes with two-dimensional photonic crystals

被引：34

作者：

Kitamura, M

Iwamoto, S

Arakawa, Y

机构：

[1] Univ Tokyo, Adv Sci & Technol Res Ctr, Meguro Ku, Tokyo 1538504, Japan

[2] Univ Tokyo, Inst Ind Sci, Meguro Ku, Tokyo 1538505, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS | 2005年 / 44卷 / 4B期

关键词：

organic light-emitting diode; photonic crystal; light-extraction efficiency; luminance efficiency; lattice constant dependence;

D O I：

10.1143/JJAP.44.2844

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Organic light-emitting diodes (OLEDs) with two-dimensional photonic crystal were fabricated to improve their light-extraction efficiency. The electroluminescence (EL) spectra from these OLEDs depended on the lattice constant of the photonic crystal. The relationship between the EL spectra and the lattice constant was investigated. On the basis of this investigation, a lattice constant was optimized to obtain a large improvement in luminance. In addition, OLEDs doped with coumarin 6 provided a larger improvement in luminance than nondoped OLEDs. The coumarin 6 doped OLED with the optimized lattice constant provided improvements of 62% in luminance in the normal direction and 25% in spatially integrated EL intensity.

引用

页码：2844 / 2848

页数：5