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Chemical changes on the green emitter tris(8-hydroxy-quinolinato)aluminum during device aging of -structured organic light emitting diodes
7.S. Scholz, R. Meerheim, K. Walzer, and K. Leo, Proc. SPIE 69991B, 47 (2008).
16.S. Scholz, Q. Huang, M. Thomschke, S. Olthof, P. Sebastian, K. Walzer, K. Leo, S. Oswald, C. Corten, and D. Kuckling, J. Appl. Phys. 104, 104502 (2008).
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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 OLEDaging. The material tris(8-hydroxy-quinolinato)aluminum , which is widely used as electron transporting material and green fluorescent emitter, degrades mainly during hole transport. We investigate the chemical changes in 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, undergoes a dissociation and further reaction with the hole blocking material 4,7-diphenyl-1,10-phenanthroline.
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