White organic light emitting diodes with enhanced internal and external outcoupling for ultra-efficient light extraction and Lambertian emission

被引：34

作者：

Bocksrocker, Tobias ^{[1
]}

Preinfalk, Jan Benedikt ^{[1
]}

Asche-Tauscher, Julian ^{[1
]}

Pargner, Andreas ^{[1
]}

Eschenbaum, Carsten ^{[1
]}

Maier-Flaig, Florian ^{[1
]}

Lemmer, Uli ^{[1
]}

机构：

[1] Karlsruhe Inst Technol KIT, Light Technol Inst, D-76131 Karlsruhe, Germany

来源：

OPTICS EXPRESS | 2012年 / 20卷 / 23期

关键词：

SCATTERING; DEVICES;

D O I：

10.1364/OE.20.00A932

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

White organic light emitting diodes (WOLEDs) suffer from poor outcoupling efficiencies. The use of Bragg-gratings to enhance the outcoupling efficiency is very promising for light extraction in OLEDs, but such periodic structures can lead to angular or spectral dependencies in the devices. Here we present a method which combines highly efficient outcoupling by a TiO2-Bragg-grating leading to a 104% efficiency enhancement and an additional high quality microlens diffusor at the substrate/air interface. With the addition of this diffusor, we achieved not only a uniform white emission, but also further increased the already improved device efficiency by another 94% leading to an overall enhancement factor of about 4. (C) 2012 Optical Society of America

引用

页码：A932 / A940

页数：9

共 24 条

[1] Nearly 100% internal phosphorescence efficiency in an organic light-emitting device [J].

Adachi, C ;

Baldo, MA ;

Thompson, ME ;

Forrest, SR .

JOURNAL OF APPLIED PHYSICS, 2001, 90 (10) :5048-5051

[2] Efficient waveguide mode extraction in white organic light emitting diodes using ITO-anodes with integrated MgF2-columns [J].

Bocksrocker, Tobias ;

Maier-Flaig, Florian ;

Eschenbaum, Carsten ;

Lemmer, Uli .

OPTICS EXPRESS, 2012, 20 (06) :6170-6174

[3] High-Efficiency Blue Emitting Phosphorescent OLEDs [J].

Chopra, Neetu ;

Lee, Jaewon ;

Xue, Jiangeng ;

So, Franky .

IEEE TRANSACTIONS ON ELECTRON DEVICES, 2010, 57 (01) :101-107

[4] Optical and electrical characteristics of organic light-emitting diodes with two-dimensional photonic crystals in organic/electrode layers [J].

Fujita, M ;

Ishihara, K ;

Ueno, T ;

Asano, T ;

Noda, S ;

Ohata, H ;

Tsuji, T ;

Nakada, H ;

Shimoji, N .

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 2005, 44 (6A) :3669-3677

[5]

Gather M. C., 2010, ADV MAT DEERFIELD BE, V23, P33

[6] Large-scale patterning of indium tin oxide electrodes for guided mode extraction from organic light-emitting diodes [J].

Geyer, Ulf ;

Hauss, Julian ;

Riedel, Boris ;

Gleiss, Sebastian ;

Lemmer, Uli ;

Gerken, Martina .

JOURNAL OF APPLIED PHYSICS, 2008, 104 (09)

[7]

Greiner H, 2007, JPN J APPL PHYS 1, V46, P4125, DOI [10.1143/JJAP.46.4125, 10.1143/JJAP.46.4125]]

[8] Metallic Bragg-gratings for light management in organic light-emitting devices [J].

Hauss, Julian ;

Bocksrocker, Tobias ;

Riedel, Boris ;

Geyer, Ulf ;

Lemmer, Uli ;

Gerken, Martina .

APPLIED PHYSICS LETTERS, 2011, 99 (10)

[9] On the interplay of waveguide modes and leaky modes in corrugated OLEDs [J].

Hauss, Julian ;

Bocksrocker, Tobias ;

Riedel, Boris ;

Lemmer, Uli ;

Gerken, Martina .

OPTICS EXPRESS, 2011, 19 (14) :A851-A858

[10] External Quantum Efficiency Above 20% in Deep Blue Phosphorescent Organic Light-Emitting Diodes [J].

Jeon, Soon Ok ;

Jang, Sang Eok ;

Son, Hyo Suk ;

Lee, Jun Yeob .

ADVANCED MATERIALS, 2011, 23 (12) :1436-1441

← 1 2 3 →