Highly efficient blue organic light-emitting diode with an oligomeric host having high triplet-energy and high electron mobility

被引：48

作者：

Jou, Jwo-Huei ^{[1
]}

Wang, Wei-Ben ^{[1
]}

Shen, Shih-Ming ^{[1
]}

Kumar, Sudhir ^{[1
]}

Lai, I-Ming ^{[1
]}

Shyue, Jing-Jong ^{[2
]}

Lengvinaite, Simona ^{[3
]}

Zostautiene, Rasa ^{[3
]}

Grazulevicius, Juozas V. ^{[3
]}

Grigalevicius, Saulius ^{[3
]}

Chen, Sun-Zen ^{[4
]}

Wu, Chung-Chih ^{[5
,6
]}

机构：

[1] Natl Tsing Hua Univ, Dept Mat Sci & Engn, Hsinchu 30013, Taiwan

[2] Acad Sinica, Res Ctr Appl Sci, Taipei 11529, Taiwan

[3] Kaunas Univ Technol, Dept Organ Technol, LT-50254 Kaunas, Lithuania

[4] Natl Tsing Hua Univ, Ctr Nanotechol Mat Sci & Microsyst, Hsinchu 30013, Taiwan

[5] Natl Taiwan Univ, Dept Elect Engn, Grad Inst Electroopt Engn, Taipei 106, Taiwan

[6] Natl Taiwan Univ, Grad Inst Elect Engn, Taipei 106, Taiwan

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2011年 / 21卷 / 26期

关键词：

ELECTROPHOSPHORESCENT DEVICES; FULL-COLOR; ELECTROLUMINESCENT; CARRIER; LAYER; STATE; PERFORMANCE; MOLECULES; DISPLAYS; OLEDS;

D O I：

10.1039/c1jm10609k

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report a high-efficiency blue organic light-emitting diode (OLED) with a solution-processed emissive layer composed of an oligomeric host of poly[3-(carbazol-9-ylmethyl)-3-methyloxetane] (PCMO) that possesses high triplet-energy and high electron mobility. The device exhibited a current efficiency of 40.4 cd A(-1) with an external quantum efficiency (EQE) of 21.6% and power efficiency of 28.2 lm W-1 at 230 cd m(-2) or 24.7 cd A(-1), 10.3%, and 15.5 lm W-1 at 1 000 cd m(-2). The high efficiency may be attributed to the host possessing a high electron mobility and lower electron injection barrier, resulting in a more balanced carrier-injection. Moreover, the high electron-mobility favors the transport of electrons, resulting in a more balanced carrier-injection in the emissive layer. The device efficiency has been further enhanced to 42.6 cd A(-1) (22.9%, 29.7 lm W-1) at 124 cd m(-2) or 28.8 cd A(-1) (15.4%, 17.8 lm W-1) at 1 000 cd m(-2) by pre-heating the emissive solution at an elevated temperature before spin-coating.

引用

页码：9546 / 9552

页数：7

共 53 条

[1] New charge-carrier blocking materials for high efficiency OLEDs [J].