Assistant dopant system in red phosphorescent OLEDs and its mechanism reveal

Assistant dopant system in red phosphorescent OLEDs and its mechanism reveal We have constructed an assistant dopant system in red phosphorescent OLEDs. In the system, we chose the 4,4′-Bis(carbazol-9-yl)biphenyl (CBP) as the host material, a thermally activated delayed fluorescence (TADF) 4CzIPN as the assistant dopant and a red phosphor Hex-Ir(phq)2(acac) as the guest. The assistant dopant system can remarkably reduce the turn-on voltage and increase device brightness. Meanwhile, devices with assist dopant system show negligible efficiency roll-off even in high luminance and current density. The current efficiency of optimized device with 15 wt% 4CzIPN only drops to 12.7 cd/A at 74,532 cd/m2 from maximum 13.7 cd/A. By further investigation on the exciton generation mechanism and the energy transfer process in the system, the main cause of the improvement has been unveiled. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Luminescence Elsevier

Assistant dopant system in red phosphorescent OLEDs and its mechanism reveal

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Publisher
Elsevier
Copyright
Copyright © 2018 Elsevier B.V.
ISSN
0022-2313
eISSN
1872-7883
D.O.I.
10.1016/j.jlumin.2017.12.065
Publisher site
See Article on Publisher Site

Abstract

We have constructed an assistant dopant system in red phosphorescent OLEDs. In the system, we chose the 4,4′-Bis(carbazol-9-yl)biphenyl (CBP) as the host material, a thermally activated delayed fluorescence (TADF) 4CzIPN as the assistant dopant and a red phosphor Hex-Ir(phq)2(acac) as the guest. The assistant dopant system can remarkably reduce the turn-on voltage and increase device brightness. Meanwhile, devices with assist dopant system show negligible efficiency roll-off even in high luminance and current density. The current efficiency of optimized device with 15 wt% 4CzIPN only drops to 12.7 cd/A at 74,532 cd/m2 from maximum 13.7 cd/A. By further investigation on the exciton generation mechanism and the energy transfer process in the system, the main cause of the improvement has been unveiled.

Journal

Journal of LuminescenceElsevier

Published: May 1, 2018

References

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