Design of Efficient Thermally Activated Delayed Fluorescence Materials for Pure Blue Organic Light Emitting Diodes

被引：1386

作者：

Zhang, Qisheng ^{[1
]}

Li, Jie ^{[1
]}

Shizu, Katsuyuki ^{[1
]}

Huang, Shuping ^{[2
]}

Hirata, Shuzo ^{[1
]}

Miyazaki, Hiroshi ^{[1
]}

Adachi, Chihaya ^{[1
]}

机构：

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

[2] Kyushu Univ, Inst Mat Chem & Engn, Nishi Ku, Fukuoka 8190395, Japan

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2012年 / 134卷 / 36期

关键词：

TRIPLET ENERGY-TRANSFER; COMPLEXES; SINGLET; ELECTROLUMINESCENCE;

D O I：

10.1021/ja306538w

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Efficient thermally activated delayed fluorescence (TADF) has been characterized for a carbazole/sulfone derivative in both solutions and doped films. A pure blue organic light emitting diode (OLED) based on this compound demonstrates a very high external quantum efficiency (EQE) of nearly 10% at low current density. Because TADF only occurs in a bipolar system where donor and acceptor centered (3)pi pi* states are close to or higher than the triplet intramolecular charge transfer (3CT) state, control of the pi-conjugation length of both donor and acceptor is considered to be as important as breaking the pi-conjugation between them in blue TADF material design.

引用

页码：14706 / 14709

页数：4

共 26 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]

[Anonymous], 1995, Excited States and Photochemistry of Organic Molecules

[3]

[Anonymous], 2002, MOL FLUORESCENCE PRI

[4] HINDERED INTERNAL-CONVERSION IN RIGID MEDIA - THERMALLY NONEQUILIBRATED 3IL AND 3CT EMISSIONS FROM [CU(5-X-PHEN)(PPH3)2]+ AND [CU(4,7-X2-PHEN)(PPH3)2]+ SYSTEMS IN A GLASS AT 77-K [J].

CASADONTE, DJ ;

MCMILLIN, DR .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1987, 109 (02) :331-337

[5] Highly efficient blue-emitting iridium(III) carbene complexes and phosphorescent OLEDs [J].

Chang, Chiung-Fang ;

Cheng, Yi-Ming ;

Chi, Yun ;

Chiu, Yuan-Chieh ;

Lin, Chao-Chen ;

Lee, Gene-Hsiang ;

Chou, Pi-Tai ;

Chen, Chung-Chia ;

Chang, Chih-Hao ;

Wu, Chung-Chih .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2008, 47 (24) :4542-4545

[6] En Route to High External Quantum Efficiency (∼12%), Organic True-Blue-Light-Emitting Diodes Employing Novel Design of Iridium (III) Phosphors [J].

Chiu, Yuan-Chieh ;

Hung, Jui-Yi ;

Chi, Yun ;

Chen, Chung-Chia ;

Chang, Chih-Hao ;

Wu, Chung-Chih ;

Cheng, Yi-Ming ;

Yu, Ya-Chien ;

Lee, Gene-Hsiang ;

Chou, Pi-Tai .

ADVANCED MATERIALS, 2009, 21 (21) :2221-+

[7] E-Type Delayed Fluorescence of a Phosphine-Supported Cu2(μ-NAr2)2 Diamond Core: Harvesting Singlet and Triplet Excitons in OLEDs [J].

Deaton, Joseph C. ;

Switalski, Steven C. ;

Kondakov, Denis Y. ;

Young, Ralph H. ;

Pawlik, Thomas D. ;

Giesen, David J. ;

Harkins, Seth B. ;

Miller, Alex J. M. ;

Mickenberg, Seth F. ;

Peters, Jonas C. .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2010, 132 (27) :9499-9508

[8] 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)

[9] REVERSIBLE TRIPLET TRIPLET ENERGY-TRANSFER WITHIN A COVALENTLY LINKED BICHROMOPHORIC MOLECULE [J].

FORD, WE ;

RODGERS, MAJ .

JOURNAL OF PHYSICAL CHEMISTRY, 1992, 96 (07) :2917-2920

[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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