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Chemical changes on the green emitter tris(8-hydroxy-quinolinato)aluminum during device aging of p-i-n-structured organic light emitting diodes

Appl. Phys. Lett. 95, 183309 (2009); doi:10.1063/1.3257380

Published 6 November 2009

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Sebastian Scholz, Björn Lüssem, and Karl Leo
Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden, Germany
Metal organic fluorescent and phosphorescent emitters are widely used in organic light emitting devices (OLEDs). Iridium-based triplet emitters are known to undergo chemical reactions with other materials during OLED aging. The material tris(8-hydroxy-quinolinato)aluminum (Alq3), which is widely used as electron transporting material and green fluorescent emitter, degrades mainly during hole transport. We investigate the chemical changes in Alq3 during device aging: using laser desorption ionization time-of-flight mass spectrometry, we study the reaction products found in degraded OLEDs. Similar to the reactions known from the phosphorescent iridium-based emitters, Alq3 undergoes a dissociation and further reaction with the hole blocking material 4,7-diphenyl-1,10-phenanthroline. ©2009 American Institute of Physics
History: Received 11 September 2009; accepted 8 October 2009; published 6 November 2009
Permalink: http://link.aip.org/link/?APPLAB/95/183309/1
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KEYWORDS and PACS

Keywords
PACS
  • 85.60.Jb
    Light-emitting devices
  • 85.30.Kk
    Semiconductor junction diodes
  • YEAR: 2009

PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
Publisher:
AIP is a member of CrossRef AIP

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