Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 16, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3123815
Keywords
aggregation; brightness; organic light emitting diodes; organic semiconductors; phosphorescence; thin films; transmission electron microscopy
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Funding
- EPSRC
- DAAD [D/07/09995]
- European Commission [IST-2002004607]
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The efficiency roll-off at high brightness levels is a key factor limiting the application of organic light emitting diodes. We investigate triplet-triplet annihilation in an archetype phosphorescent host-guest system. We show that the currently used host-guest systems are not at the physical limit set by intrinsic annihilation, but have an increased roll-off due to aggregate formation. The existence of these aggregates is directly proven by transmission electron microscopy.
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