Organic Luminescent Molecule with Energetically Equivalent Singlet and Triplet Excited States for Organic Light-Emitting Diodes

被引：191

作者：

Sato, Keigo ^{[1
]}

Shizu, Katsuyuki ^{[1
]}

Yoshimura, Kazuaki ^{[3
]}

Kawada, Atsushi ^{[4
]}

Miyazaki, Hiroshi ^{[1
,4
]}

Adachi, Chihaya ^{[1
,2
]}

机构：

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

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

[3] Nippon Steel Chem Co Ltd, Basic Res Labs, Kitakyushu, Fukuoka 8048503, Japan

[4] Nippon Steel Chem Co Ltd, Funct Mat Labs, Kitakyushu, Fukuoka 8048503, Japan

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 24期

关键词：

ACTIVATED DELAYED FLUORESCENCE; EFFICIENCY; COMPLEXES;

D O I：

10.1103/PhysRevLett.110.247401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We demonstrate an organic molecule with an energy gap between its singlet and triplet excited states of almost zero (Delta E-ST similar to 0 eV). Such separation was realized through proper combination of an electron-donating indolocarbazole group and a diphenyltriazine electron-accepting moiety. Calculated and measured Delta E-ST were 0.003 and 0.02 eV, respectively. A total photoluminescence efficiency of 59% +/- 2% with 45% +/- 2% from a delayed component and 14% +/- 2% from a prompt component was obtained for a doped film. Organic light emitting diodes containing this molecule as an emitting dopant exhibited an unexpectedly high external electroluminescence efficiency of eta(EQE) = 14% +/- 1%.

引用

页数：5

共 29 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], 1991, MODERN MOL PHOTOCHEM

[3] Very high-efficiency green organic light-emitting devices based on electrophosphorescence [J].

Baldo, MA ;

Lamansky, S ;

Burrows, PE ;

Thompson, ME ;

Forrest, SR .

APPLIED PHYSICS LETTERS, 1999, 75 (01) :4-6

[4]

Brutting W., 2005, Physics of Organic Semiconductors

[5] Recent Developments in Top-Emitting Organic Light-Emitting Diodes [J].

Chen, Shufen ;

Deng, Lingling ;

Xie, Jun ;

Peng, Ling ;

Xie, Linghai ;

Fan, Quli ;

Huang, Wei .

ADVANCED MATERIALS, 2010, 22 (46) :5227-5239

[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] Photoluminescence characteristics of tris(2-phenylquinoline)iridium(III) dispersed in an iridium complex host layer [J].

Endo, Ayataka ;

Adachi, Chihaya .

CHEMICAL PHYSICS LETTERS, 2009, 483 (4-6) :224-226

[9]

Flattery David K., 2011, Information Display, V27, P8

[10] Determination of molecular dipole orientation in doped fluorescent organic thin films by photoluminescence measurements [J].

Frischeisen, Joerg ;

Yokoyama, Daisuke ;

Adachi, Chihaya ;

Bruetting, Wolfgang .

APPLIED PHYSICS LETTERS, 2010, 96 (07)

← 1 2 3 →