Triplet-triplet upconversion enhanced by spin-orbit coupling in organic light-emitting diodes

被引：138
作者：
Ieuji, Ryota [1 ,2 ,3 ]
Goushi, Kenichi [1 ,2 ,3 ,4 ]
Adachi, Chihaya [1 ,2 ,3 ,4 ]
机构：
[1] Kyushu Univ, Dept Appl Chem, Nishi Ku, 744 Motooka, Fukuoka, Fukuoka 8190395, Japan
[2] Kyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, 744 Motooka, Fukuoka, Fukuoka 8190395, Japan
[3] Kyushu Univ, Adachi Mol Exciton Engn Project, Japan Sci & Technol Agcy JST, Exploratory Res Adv Technol ERATO,Nishi Ku, 744 Motooka, Fukuoka, Fukuoka 8190395, Japan
[4] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Nishi Ku, 744 Motooka, Fukuoka, Fukuoka 8190395, Japan
来源：
NATURE COMMUNICATIONS | 2019年 / 10卷 / 1期
基金：
日本科学技术振兴机构;
关键词：
ACTIVATED DELAYED FLUORESCENCE; SINGLET; PHOSPHORESCENCE; EFFICIENCY; MECHANISM; EMISSION; EXCITONS; STATES;
D O I：
10.1038/s41467-019-13044-1
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Triplet-triplet upconversion, in which two triplet excitons are converted to one singlet exciton, is a well-known approach to exceed the limit of electroluminescence quantum efficiency in conventional fluorescence-based organic light-emitting diodes. Considering the spin multiplicity of triplet pairs, upconversion efficiency is usually limited to 20%. Although this limit can be exceeded when the energy of a triplet pair is lower than that of a second triplet excited state, such as for rubrene, it is generally difficult to engineer the energy levels of higher triplet excited states. Here, we investigate the upconversion efficiency of a series of new anthracene derivatives with different substituents. Some of these derivatives show upconversion efficiencies close to 50% even though the calculated energy levels of the second triplet excited states are lower than twice the lowest triplet energy. A possible upconversion mechanism is proposed based on the molecular structures and quantum chemical calculations.
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页数：10
相关论文
共 37 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]   Highly efficient phosphorescent emission from organic electroluminescent devices [J].
Baldo, MA ;
O'Brien, DF ;
You, Y ;
Shoustikov, A ;
Sibley, S ;
Thompson, ME ;
Forrest, SR .
NATURE, 1998, 395 (6698) :151-154
[3]   On the efficiency limit of triplet-triplet annihilation for photochemical upconversion [J].
Cheng, Yuen Yap ;
Khoury, Tony ;
Clady, Raphael G. C. R. ;
Tayebjee, Murad J. Y. ;
Ekins-Daukes, N. J. ;
Crossley, Maxwell J. ;
Schmidt, Timothy W. .
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2010, 12 (01) :66-71
[4]   Ultrahigh Efficiency Fluorescent Single and Bi-Layer Organic Light Emitting Diodes: The Key Role of Triplet Fusion [J].
Chiang, Chien-Jung ;
Kimyonok, Alpay ;
Etherington, Marc K. ;
Griffiths, Gareth C. ;
Jankus, Vygintas ;
Turksoy, Figen ;
Monkman, Andy P. .
ADVANCED FUNCTIONAL MATERIALS, 2013, 23 (06) :739-746
[5]   Efficient delayed fluorescence via triplet-triplet annihilation for deep-blue electroluminescence [J].
Chou, P. -Y. ;
Chou, H. -H. ;
Chen, Y. -H. ;
Su, T. -H. ;
Liao, C. -Y. ;
Lin, H. -W. ;
Lin, W. -C. ;
Yen, H. -Y. ;
Chen, I. -C. ;
Cheng, C. -H. .
CHEMICAL COMMUNICATIONS, 2014, 50 (52) :6869-6871
[6]   Controlling Singlet-Triplet Energy Splitting for Deep-Blue Thermally Activated Delayed Fluorescence Emitters [J].
Cui, Lin-Song ;
Nomura, Hiroko ;
Geng, Yan ;
Kim, Jong Uk ;
Nakanotani, Hajime ;
Adachi, Chihaya .
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2017, 56 (06) :1571-1575
[7]   LONG-LIFETIME PHOSPHORESCENCE AND THE DIFFUSION PROCESS [J].
DEBYE, P ;
EDWARDS, JO .
JOURNAL OF CHEMICAL PHYSICS, 1952, 20 (02) :236-239
[8]   Efficient Triplet Exciton Fusion in Molecularly Doped Polymer Light-Emitting Diodes [J].
Di, Dawei ;
Yang, Le ;
Richter, Johannes M. ;
Meraldi, Lorenzo ;
Altamimi, Rashid M. ;
Alyamani, Ahmed Y. ;
Credgington, Dan ;
Musselman, Kevin P. ;
MacManus-Driscoll, Judith L. ;
Friend, Richard H. .
ADVANCED MATERIALS, 2017, 29 (13)
[9]   TRIPLET STATE - ITS RADIATIVE AND NONRADIATIVE PROPERTIES [J].
ELSAYED, MA .
ACCOUNTS OF CHEMICAL RESEARCH, 1968, 1 (01) :8-&
[10]   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-+
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