Journal
ADVANCED OPTICAL MATERIALS
Volume 9, Issue 5, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202001965
Keywords
carbene– metal– amides; exciton energy transfer; hyperfluorescent OLEDs
Categories
Funding
- Engineering and Physical Sciences Research Council (EPSRC) [EP/M005143/1]
- Royal Society [UF130278]
- European Research Council (ERC)
- Samsung Display Co., Ltd (SDC)
- George and Lilian Schiff Foundation
- EPSRC [EP/M005143/1] Funding Source: UKRI
- Royal Society [UF130278] Funding Source: Royal Society
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The use of a two-component emissive system along with tert-butyl steric substituents can reduce driving voltage and increase power conversion efficiency for hyperfluorescent organic light-emitting diodes. Matrix-free hyperfluorescent devices can achieve a maximum external quantum efficiency of 16.5%.
A wide-gap host matrix is a major obstacle detrimentally influencing the performance of hyperfluorescent organic light-emitting diodes since it substantially increases driving voltage. Moreover, these hyperfluorescent devices typically require at least three components in their emitting layer, which is unfavorable for mass production. To tackle the issue, hyperfluorescent organic light-emitting diodes are reported based on a two-component emissive system of carbene-metal-amide donors and conventional fluorescent acceptors. A significant reduction of the driving voltage versus three-component hyperfluorescent devices at practical brightness (1000 cd m(-2)) is demonstrated, leading to a doubling of power conversion efficiency for some composites. From an analysis of thin-film photophysics, it is shown that operational efficiency is limited by Dexter energy transfer between donors and acceptors, which may be reduced by tert-butyl steric substituents, providing new targets for molecular design. While reducing driving voltage, matrix-free hyperfluorescent devices also achieve a maximum external quantum efficiency of 16.5%.
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