Highly efficient blue electroluminescence based on thermally activated delayed fluorescence

被引：0

作者：

Hirata S. ^{[1
]}

Sakai Y. ^{[1
,2
]}

Masui K. ^{[1
,3
]}

Tanaka H. ^{[1
]}

Lee S.Y. ^{[1
,4
]}

Nomura H. ^{[1
]}

Nakamura N. ^{[1
]}

Yasumatsu M. ^{[1
]}

Nakanotani H. ^{[1
,4
,5
]}

Zhang Q. ^{[1
,4
]}

Shizu K. ^{[1
,4
]}

Miyazaki H. ^{[1
,6
]}

Adachi C. ^{[1
,4
,7
]}

机构：

[1] Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka

[2] Research and Development Department, Dyden Corporation, 1-1 Hyakunenkouen, Kurume, Fukuoka

[3] Advanced Core Technology Laboratories, Fujifilm Corporation, 577 Ushijima, Kaisei, Ashigarakami, Kanagawa

[4] JST, ERATO, Adachi Molecular Exciton Engineering Project, 744 Motooka, Nishi, Fukuoka

[5] Innovative Organic Device Laboratory, Institute of Systems, Information Technologies and Nanotechnologies (ISIT), 744 Motooka, Nishi, Fukuoka

[6] Nippon Steel and Sumikin Chemical Co. Ltd., 46-80, Nakabaru Sakinohama, Tobata, Kitakyushu

[7] International Institute for Carbon Neutral Energy Research, Kyushu University, 744 Motooka, Nishi, Fukuoka

来源：

Nature Materials | 2015年 / 14卷 / 3期

基金：

日本学术振兴会;

关键词：

D O I：

10.1038/nmat4154

中图分类号：

学科分类号：

摘要：

Organic compounds that exhibit highly efficient, stable blue emission are required to realize inexpensive organic light-emitting diodes for future displays and lighting applications. Here, we define the design rules for increasing the electroluminescence efficiency of blue-emitting organic molecules that exhibit thermally activated delayed fluorescence. We show that a large delocalization of the highest occupied molecular orbital and lowest unoccupied molecular orbital in these charge-transfer compounds enhances the rate of radiative decay considerably by inducing a large oscillator strength even when there is a small overlap between the two wavefunctions. A compound based on our design principles exhibited a high rate of fluorescence decay and efficient up-conversion of triplet excitons into singlet excited states, leading to both photoluminescence and internal electroluminescence quantum yields of nearly 100%. © 2015 Macmillan Publishers Limited. All rights reserved.

引用

页码：330 / 336

页数：6

共 37 条

[1]

Tang C.W., Vanslyke S.A., Organic electroluminescent diodes, Appl. Phys. Lett., 51, pp. 913-915, (1987)

[2]

Reineke S., Et al., White organic light-emitting diodes with fluorescent tube efficiency, Nature, 459, pp. 234-238, (2009)

[3]

Kim S., Et al., Low-power flexible organic light-emitting diode display device, Adv. Mater., 23, pp. 3511-3516, (2011)

[4]

Yu Z., Niu X., Liu Z., Pei Q., Intrinsically stretchable polymer light-emitting devices using carbon nanotube-polymer composite electrodes, Adv. Mater., 23, pp. 3989-3994, (2011)

[5]

Baldo M.A., Et al., Highly efficient phosphorescent emission from organic electroluminescent devices, Nature, 395, pp. 151-154, (1998)

[6]

Adachi C., Baldo M.A., Thompson M.E., Forrest S.R., Nearly 100% internal phosphorescence efficiency in an organic light-emitting device, J. Appl. Phys., 90, pp. 5048-5051, (2001)

[7]

Deaton J.C., Et al., E-type delayed fluorescence of a phosphine-supported Cu2(NAr2)2 diamond core: Harvesting singlet and triplet excitons in OLEDs, J. Am. Chem. Soc., 132, pp. 9499-9508, (2010)

[8]

Hashimoto M., Et al., Highly efficient green organic light-emitting diodes containing luminescent three-coordinate copper(I) complexes, J. Am. Chem. Soc., 133, pp. 10348-10351, (2011)

[9]

Okumoto K., Kanno H., Hamada Y., Takahashi H., Shibata K., Green fluorescent organic light-emitting device with external quantum efficiency of nearly 10%, Appl. Phys. Lett., 89, (2006)

[10]

Kondakov D.Y., Characterization of triplet-triplet annihilation in organic light-emitting diodes based on anthracene derivatives, J. Appl. Phys., 102, (2007)

← 1 2 3 4 →