Deep blue light-emitting diode based on high molecular weight poly(9,9-dioctylfluorene) with high efficiency and color stability

Shin Rong Tseng, Shiuan Yi Li, Hsin-Fei Meng*, Yi Hsiang Yu, Chia Ming Yang, Hua Hsien Liao, Sheng Fu Horng, Chain-Shu Hsu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

A highly efficient deep blue polymer light-emitting diode based on poly(9,9-dioctylfluorene) is demonstrated. The performance is found to increase significantly with the molecular weight. Two different molecular weights are compared, one is 71,000 and the other is 365,000. The electroluminescent efficiency and color stability are improved by slightly doping hole traps into the emission layer and bilayer structure. The maximum efficiency is 3.8 cd/A with the corresponding external quantum efficiency of 3.7% at deep blue with Commission Internationale de L'Eclairage (CIE) coordinate at (0.15, 0.09). Stable blue emission is maintained up to 6600 cd/m2 without growth of green shoulder in emission spectrum.

Original languageEnglish
Pages (from-to)279-284
Number of pages6
JournalOrganic Electronics
Volume9
Issue number3
DOIs
StatePublished - 1 Jan 2008

Keywords

  • Blocking layer
  • Deep blue
  • Molecular weight
  • Polymer light-emitting diodes
  • Stability

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