Dependence of the current and power efficiencies of organic light-emitting diode on the thickness of the constituent organic layers

Author

Qiu, Chengfeng ; Chen, Haiying ; Man Weng ; Kwok, Hoi S.

Author_Institution

Dept. of Electr. & Electron. Eng., Hong Kong Univ., China

Volume

48

Issue

9

fYear

2001

fDate

9/1/2001 12:00:00 AM

Firstpage

2131

Lastpage

2137

Abstract

The dependence of the current and power efficiencies of bi-layer organic light-emitting diodes (OLEDs) on the thickness of the constituent organic layers is reported. The thickness of the electron and hole transport layers was simultaneously varied to determine the optimal configuration for power efficiency. It was verified that the inclusion of a suitable electrode buffer layer reduced the effective energy barrier against carrier injection, thus improved the injection efficiency. An optimal thickness for the electrode buffer layer was also identified and explained

Keywords

light emitting diodes; organic compounds; bi-layer organic light emitting diode; carrier injection efficiency; current efficiency; electrode buffer layer; electron transport layer; energy barrier; hole transport layer; organic layer thickness; power efficiency; Buffer layers; Charge carrier processes; Electrodes; Energy barrier; Energy states; Flat panel displays; Liquid crystal displays; Organic light emitting diodes; Organic semiconductors; Semiconductor diodes;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/16.944206

Filename

944206