Influence of Thickness on Performance of Blue Single-Layer Organic Light-Emitting Device

Author

Yongming Yin ; Xuemei Wen ; Jing Yu ; Letian Zhang ; Wenfa Xie

Author_Institution

State Key Lab. on Integrated Optoelectron., Jilin Univ., Changchun, China

Volume

25

Issue

22

fYear

2013

fDate

Nov.15, 2013

Firstpage

2205

Lastpage

2208

Abstract

Single-layer (SL) blue organic light-emitting devices (BOLEDs) with a bipolar transport host were fabricated. The effects of the active layer thickness on the color purity, efficiency, and efficiency roll-off were investigated. An SL BOLED with 70 nm active layer showed good color purity, high efficiency, and extremely low efficiency roll-off. The power efficiency at 1000 cd/cm² of the device was 13.1 lm/W. From the brightness at maximum external quantum efficiency to high brightness of 5000 cd/m², the efficiency roll-off was 11.8%. The excellent performance could be attributed to the broader exciton formation zone and balance of charge carrier injection and transport.

Keywords

brightness; excitons; organic light emitting diodes; BOLED; active layer thickness; bipolar transport host; blue single-layer organic light-emitting device; brightness; charge carrier injection; charge carrier transport; color purity; efficiency roll-off; exciton formation zone; power efficiency; quantum efficiency; size 70 nm; Brightness; Cathodes; Color; Excitons; Materials; Organic light emitting diodes; Performance evaluation; Organic light-emitting device; single-layer;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2013.2283215

Filename

6612717