Journal
CHEMICAL PHYSICS LETTERS
Volume 590, Issue -, Pages 106-110Publisher
ELSEVIER
DOI: 10.1016/j.cplett.2013.10.048
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Funding
- U.S. Department of Energy, Center for Energy Nanoscience at the University of Southern California [DE-SC0001013]
- Universal Display Corporation (SRF, analysis)
- University of Michigan
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In organic materials, triplet-triplet annihilation (TTA) can be dominated by triplet diffusion or triplet-to-triplet energy transfer. Here, we discuss the diffusion and transfer dominated mechanisms in the context of photoluminescence (PL) transient measurements from thin films of archetype phosphorescent organic light emitters based on Ir and Pt complexes. We find that TTA in these emitters is controlled by diffusion due to a Dexter-type exchange interaction, suggesting triplet radiative decay and TTA are independent processes. Minimizing the PL and absorption spectral overlap in phosphorescent emitters can lead to a significantly decreased TTA rate, and thus suppressed efficiency roll-off in phosphorescent organic light emitting diodes at high brightness. (C) 2013 Elsevier B. V. All rights reserved.
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