White organic light-emitting diodes using double electron transporting layers

Author

Lee, Seok Jae ; Seo, Ji Hoon ; Koo, Ja Ryong ; Hyung, Gun Woo ; Lee, Kum Hee ; Yoon, Seung Soo ; Kim, Young Kwan

Author_Institution

Dept. of Inf. Display, Hongik Univ., Seoul, South Korea

fYear

2011

fDate

21-24 June 2011

Firstpage

1

Lastpage

2

Abstract

The authors have demonstrated white organic light-emitting diodes (WOLEDs) with doublue electron transporting layers (D-ETL) using 9-dimethyl-4,7-diphenyl-1,10-phenanhroline / 4,7-diphenyl-1,10-phenanthroline (BPhen) and bis-(2-methyl-8-quinolinolate)-4-(phenylphenolato)aluminium / BPhen. Ste pwise D-ETL can transport electron easily to emitting layer and reduce leakage of electrons. Therefore, WOLEDs with D-ETL exhibited higher external quantum efficiency (EQE) than control WOLED with single ETL device. The optimized WOLEDs showed an EQE of 11.4%, a current efficiency of 24.1 cd/A, and a Commission Internationale de I´Eclairage coordinates of (0.40, 0.39) at 1 mA/cm².

Keywords

organic compounds; organic light emitting diodes; ETL device; WOLED; bis-(2-methyl-8-quinolinolate)-4-(phenylphenolato)aluminium; double electron transporting layers; efficiency 11.4 percent; external quantum efficiency; white organic light-emitting diodes; Current density; Electron mobility; Excitons; Indium tin oxide; Organic light emitting diodes; Temperature measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Nanoelectronics Conference (INEC), 2011 IEEE 4th International

Conference_Location

Tao-Yuan

ISSN

2159-3523

Print_ISBN

978-1-4577-0379-9

Electronic_ISBN

2159-3523

Type

conf

DOI

10.1109/INEC.2011.5991802

Filename

5991802