Operational lifetimes of organic light-emitting diodes dominated by Förster resonance energy transfer

Scientific Reports
Hirohiko FukagawaToshihiro Yamamoto

Abstract

Organic light-emitting diodes are a key technology for next-generation information displays because of their low power consumption and potentially long operational lifetimes. Although devices with internal quantum efficiencies of approximately 100% have been achieved using phosphorescent or thermally activated delayed fluorescent emitters, a systematic understanding of materials suitable for operationally stable devices is lacking. Here we demonstrate that the operational stability of phosphorescent devices is nearly proportional to the Förster resonance energy transfer rate from the host to the emitter when thermally activated delayed fluorescence molecules are used as the hosts. We find that a small molecular size is a requirement for thermally activated delayed fluorescence molecules employed as phosphorescent hosts; in contrast, an extremely small energy gap between the singlet and triplet excited states, which is essential for an efficient thermally activated delayed fluorescent emitter, is unnecessary in the phosphorescent host.

References

Dec 14, 2012·Nature·Hiroki UoyamaChihaya Adachi
Sep 26, 2014·Nature Communications·Yifan ZhangStephen R Forrest
Mar 2, 2016·Scientific Reports·Daniel Ping-Kuen Tsang, Chihaya Adachi

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Citations

Oct 3, 2017·Physical Chemistry Chemical Physics : PCCP·Jamuna K Vaishnav, Tushar Kanti Mukherjee
Jan 31, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Yukiko IwasakiTakahisa Shimizu
Jul 28, 2020·Nature Communications·Hirohiko FukagawaTakahisa Shimizu
Jan 14, 2021·Advanced Science·Sujith Sudheendran SwayamprabhaJwo-Huei Jou
Feb 16, 2021·Advanced Materials·Yu Kyung MoonYoungmin You
Jul 8, 2021·Physical Chemistry Chemical Physics : PCCP·Palivela Siva GangadharLingamallu Giribabu
Nov 2, 2018·ACS Applied Materials & Interfaces·Marco ColellaAndrew P Monkman

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Methods Mentioned

BETA
FRET

Software Mentioned

PIC
TRZ2

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