Luminance efficiency improvement of organic light emitting diode using multiple-quantum-well structure

Yu Meng Shi*, Zhen Bo Deng, Deng Hui Xu, Jing Xiao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Organic light-emitting diodes (OLEDs) with multiple-quantum-well structures, which consist of acromatic diamine and bathocuproine have been fabricated. The structure of the device is ITO/[NPB/BCP]n/AlQ/LiF/Al. The effect of the multiple-quantum-well (MQW) structure on the performance of OLEDs with tris (8-hydroxyquinoline) aluminum as the emitting material has been investigated. The emitting zone can be changed with the number of MQW. The maximum brightness of white emitting device reaches 3433.8 cd/m2. The luminous efficiency is 2.26 cd/A at the current density of 60.9 mA/cm2. The brightness of the diode with the MQW number of 5 has been reached 8661.0 cd/m2 with respect to 2512.8 cd/m2 of the conventional green emitting diode without the MQW structure (ITO/NPB/AlQ/LiF/Al). The highest luminous efficiency is 4.94 cd/A at the current density of 20 mA/cm2. Such an improvement in the device performance should be attributed to the improved hole-electron balance, which can be further attributed to the introduction of the MQW structure.

Original languageEnglish (US)
Pages (from-to)171-174
Number of pages4
JournalGuangdianzi Jiguang/Journal of Optoelectronics Laser
Volume18
Issue number2
StatePublished - Feb 2007
Externally publishedYes

Keywords

  • Carrier
  • Hole injection
  • Organic light-emitting diodes (OLED)
  • Performance of devices

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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