High-efficiency blue multilayer polymer light-emitting diode fabricated by a general liquid buffer method

Shin Rong Tseng, Hsin-Fei Meng*, Chi Hung Yeh, Huan Chung Lai, Sheng Fu Horng, Hua Hsien Liao, Chain-Shu Hsu, Li Chi Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

A bright, highly efficient blue polymer light-emitting diode is fabricated by spin-coating with multilayer structure. By introducing a liquid buffer layer, the dissolution problem is overcome successfully. This general method can be applied to fabricate arbitrary polymer multilayer structure, in particular the addition of the carrier blocking layers to balance the electron and hole currents and improve the device efficiency. By adding an electron-blocking layer, the external quantum efficiency for blue emission can be increased to 5.5% (9.1 cd/A) which is even higher than the theoretical limit of 5%. The luminance reaches 26,530 cd/m2and the Commission Internationale de L'Eclairage (CIE) coordinates is (0.15, 0.23). Further more the lifetime is increased by three times relative to the single layer device.

Original languageEnglish
Pages (from-to)130-134
Number of pages5
JournalSynthetic Metals
Volume158
Issue number3-4
DOIs
StatePublished - 1 Feb 2008

Keywords

  • Blue
  • High efficiency
  • Multilayer
  • Polymer light-emitting diodes
  • White

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