Analysis of exciton annihilation in high-efficiency sky-blue organic light-emitting diodes with thermally activated delayed fluorescence

被引：486

作者：

Masui, Kensuke ^{[1
,2
]}

Nakanotani, Hajime ^{[1
,3
]}

Adachi, Chihaya ^{[1
,3
,4
]}

机构：

[1] Kyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan

[2] Fujifilm Corp, Adv Core Technol Labs, Kaisei, Kanagawa 2588577, Japan

[3] Inst Syst Informat Technol & Nanotechnol ISIT, Innovat Organ Device Lab, Nishi Ku, Fukuoka 8190395, Japan

[4] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Nishi Ku, Fukuoka 8190395, Japan

来源：

ORGANIC ELECTRONICS | 2013年 / 14卷 / 11期

关键词：

Organic light-emitting diodes; Exciton annihitation; Singlet-triplet quenching; Thermally activated delayed fluorescence; ELECTROPHOSPHORESCENCE; TRANSIENT;

D O I：

10.1016/j.orgel.2013.07.010

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study external quantum efficiency (eta(EQE)) roll-off in organic light-emitting diodes (OLEDs) using thermally-activated delayed fluorescence (TADF) of 4,5-di (9H-carbazol-9-yl) phthalonitrile (2CzPN). Using 2CzPN intramolecular rate constants from optical analyses, we construct an exciton quenching model incorporating intersystem crossing and reverse intersystem crossing. The model indicates that singlet-triplet annihilation and triplet-triplet annihilation dominate eta(EQE) roll-off because of the relatively long 2CzPN triplet lifetime of 273 mu s. This work yields a method to relax the exciton quenching process in TADF based OLEDs. (C) 2013 Elsevier B. V. All rights reserved.

引用

页码：2721 / 2726

页数：6

共 30 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] Electroluminescence mechanisms in organic light emitting devices employing a europium chelate doped in a wide energy gap bipolar conducting host [J].

Adachi, C ;

Baldo, MA ;

Forrest, SR .

JOURNAL OF APPLIED PHYSICS, 2000, 87 (11) :8049-8055

[3] Transient analysis of organic electrophosphorescence. II. Transient analysis of triplet-triplet annihilation [J].

Baldo, MA ;

Adachi, C ;

Forrest, SR .

PHYSICAL REVIEW B, 2000, 62 (16) :10967-10977

[4] Exciton quenching in highly efficient europium-complex based organic light-emitting diodes [J].

Canzler, TW ;

Kido, J .

ORGANIC ELECTRONICS, 2006, 7 (01) :29-37

[5] Theoretical analysis on light-extraction efficiency of organic light-emitting diodes using FDTD and mode-expansion methods [J].

Chutinan, A ;

Ishihara, K ;

Asano, T ;

Fujita, M ;

Noda, S .

ORGANIC ELECTRONICS, 2005, 6 (01) :3-9

[6] Efficient up-conversion of triplet excitons into a singlet state and its application for organic light emitting diodes [J].

Endo, Ayataka ;

Sato, Keigo ;

Yoshimura, Kazuaki ;

Kai, Takahiro ;

Kawada, Atsushi ;

Miyazaki, Hiroshi ;

Adachi, Chihaya .

APPLIED PHYSICS LETTERS, 2011, 98 (08)

[7] Thermally Activated Delayed Fluorescence from Sn4+-Porphyrin Complexes and Their Application to Organic Light-Emitting Diodes - A Novel Mechanism for Electroluminescence [J].

Endo, Ayataka ;

Ogasawara, Mai ;

Takahashi, Atsushi ;

Yokoyama, Daisuke ;

Kato, Yoshimine ;

Adachi, Chihaya .

ADVANCED MATERIALS, 2009, 21 (47) :4802-+

[8] Quantum efficiency roll-off at high brightness in fluorescent and phosphorescent organic light emitting diodes [J].

Giebink, N. C. ;

Forrest, S. R. .

PHYSICAL REVIEW B, 2008, 77 (23)

[9] Efficient organic light-emitting diodes through up-conversion from triplet to singlet excited states of exciplexes [J].

Goushi, Kenichi ;

Adachi, Chihaya .

APPLIED PHYSICS LETTERS, 2012, 101 (02)

[10] Organic light-emitting diodes employing efficient reverse intersystem crossing for triplet-to-singlet state conversion [J].

Goushi, Kenichi ;

Yoshida, Kou ;

Sato, Keigo ;

Adachi, Chihaya .

NATURE PHOTONICS, 2012, 6 (04) :253-258

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