Efficient Triplet Exciton Fusion in Molecularly Doped Polymer Light-Emitting Diodes.
basic_science · Level V
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- Record sourced from PubMed, PMID 28145598.
- Also identified by DOI 10.1002/adma.201605987.
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Abstract
Solution-processed polymer organic light-emitting diodes (OLEDs) doped with triplet-triplet annihilation (TTA)-upconversion molecules, including 9,10-diphenylanthracene, perylene, rubrene and TIPS-pentacene, are reported. The fraction of triplet-generated electroluminescence approaches the theoretical limit. Record-high efficiencies in solution-processed OLEDs based on these materials are achieved. Unprecedented solid-state TTA-upconversion quantum yield of 23% (TTA-upconversion reaction efficiency of 70%) at electrical excitation well below one-sun equivalent is observed.