Journal
THIN SOLID FILMS
Volume 445, Issue 2, Pages 353-357Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0040-6090(03)01184-2
Keywords
polymer light-emitting device; phosphorescent polymer; quantum efficiency; recombination factor
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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. (C) 2003 Elsevier B.V. All rights reserved.
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