Efficient multilayer and single layer phosphorescent organic lightemitting devices using a host with balanced bipolar transporting properties and appropriate energy level

被引：14

作者：

Zang, Chunxiu ^{[1
]}

Peng, Xiaomei ^{[1
]}

Wang, Hui ^{[1
]}

Yu, Ziwei ^{[1
]}

Zhang, Letian ^{[1
]}

Xie, Wenfa ^{[1
]}

Zhao, Hongyu ^{[2
]}

机构：

[1] Jilin Univ, Coll Elect Sci & Engn, State Key Lab Integrated Optoelect, Changchun 130012, Jilin, Peoples R China

[2] Beijing Tuocai Optoelect Technol CO LTD, Beijing 100086, Peoples R China

来源：

ORGANIC ELECTRONICS | 2017年 / 50卷

基金：

中国国家自然科学基金;

关键词：

Bipolar; Organic light-emitting device; Single-layer; Roll-off; LIGHT-EMITTING DEVICES; TRANSIENT ANALYSIS; ELECTROPHOSPHORESCENCE; DIODES; MECHANISM; EMISSION; CARRIER; ORANGE;

D O I：

10.1016/j.orgel.2017.07.034

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Efficient multilayer (ML) and single layer (SL) phosphorescent organic light-emitting devices (PHOLEDs) with a bipolar host 9,9'-[4'-(2-ethyl-1H-benzimidazol-1-yl) [1,1'-biphenyl]-3,5-diyl] bis-H-Carbazole (EBBPC) are fabricated. The photophysical, electrochemical and carrier transporting properties of EBBPC host are investigated. The maximum external quantum efficiency (EQE) can reach 14.9%, 15.6%, 16.0% and 15.4% for red (R), green (G), blue (B), and white ML-PHOLEDs, respectively. And the maximum EQE can also reach 10.1%, 14.6% and 9.8% for R, G, and B SL-PHOLEDs, respectively. Besides, the SL-PHOLEDs show low efficiency roll-off due to the broader exciton formation zone in SL OLEDs. The excellent performance of ML-and SL-PHOLEDs could be attributed to the balanced bipolar transporting properties and appropriate energy level of the host. (C) 2017 Elsevier B. V. All rights reserved.

引用

页码：106 / 114

页数：9

共 45 条

[1] High-efficiency red electrophosphorescence devices [J].

Adachi, C ;

Baldo, MA ;

Forrest, SR ;

Lamansky, S ;

Thompson, ME ;

Kwong, RC .

APPLIED PHYSICS LETTERS, 2001, 78 (11) :1622-1624

[2] 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

[3] Endothermic energy transfer: A mechanism for generating very efficient high-energy phosphorescent emission in organic materials [J].

Adachi, C ;

Kwong, RC ;

Djurovich, P ;

Adamovich, V ;

Baldo, MA ;

Thompson, ME ;

Forrest, SR .

APPLIED PHYSICS LETTERS, 2001, 79 (13) :2082-2084

[4] Degradation mechanism of small molecule-based organic light-emitting devices [J].

Aziz, H ;

Popovic, ZD ;

Hu, NX ;

Hor, AM ;

Xu, G .

SCIENCE, 1999, 283 (5409) :1900-1902

[5] 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

[6] 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

[7] High-efficiency fluorescent organic light-emitting devices using a phosphorescent sensitizer [J].

Baldo, MA ;

Thompson, ME ;

Forrest, SR .

NATURE, 2000, 403 (6771) :750-753

[8] 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

[9] Transient analysis of organic electrophosphorescence: I. Transient analysis of triplet energy transfer [J].

Baldo, MA ;

Forrest, SR .

PHYSICAL REVIEW B, 2000, 62 (16) :10958-10966

[10] High-efficiency red, green and blue phosphorescent homojunction organic light-emitting diodes based on bipolar host materials [J].

Cai, Chao ;

Su, Shi-Jian ;

Chiba, Takayuki ;

Sasabe, Hisahiro ;

Pu, Yong-Jin ;

Nakayama, Kenichi ;

Kido, Junji .

ORGANIC ELECTRONICS, 2011, 12 (05) :843-850

← 1 2 3 4 5 →