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Improvement of emission efficiency in polymer light-emitting devices based on phosphorescent polymers

Authors
Journal
Thin Solid Films
0040-6090
Publisher
Elsevier
Publication Date
Volume
445
Issue
2
Identifiers
DOI: 10.1016/s0040-6090(03)01184-2
Keywords
  • Polymer Light-Emitting Device
  • Phosphorescent Polymer
  • Quantum Efficiency
  • Recombination Factor
Disciplines
  • Physics

Abstract

Abstract We report improvement of emission efficiency in polymer light-emitting devices (PLEDs) employing phosphorescent polymers. A hole-blocking layer was inserted between the emissive layer and the cathode to enhance recombination efficiency for the injected holes and electrons. Aluminum(III)bis(2-methyl-8-quinolinato)4-phenylphenolato (BAlq) was used for the hole-blocking layer. The resultant PLEDs exhibited significant improvement of emission efficiency. The respective external quantum efficiencies for red, green and blue PLEDs were 6.6, 11 and 6.9%. These values are very high compared with those based on conventional fluorescent polymers.

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