Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 2, Pages 1219-1225Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am507050g
Keywords
organic light-emitting diode; thermally activated delayed fluorescence; reverse intersystem crossing; starshaped carbazole-based compound; blue iridium complex; density functional theory
Funding
- European Union
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We fabricated a yellow organic light-emitting diode (OLED) based on the star-shaped donor compound tri(9-hexylcarbazol-3-yl)amine, which provides formation of the interface exciplexes with the iridium(III) bis[4,6-difluorophenyl]-pyridinato-N,C2']picolinate (FIrpic). The exciplex emission is characterized by a broad band and provides a condition to realize the highly effective white OLED. It consists of a combination of the blue phosphorescent emission from the FIrpic complex and a broad efficient delayed fluorescence induced by thermal activation with additional direct phosphorescence from the triplet exciplex formed at the interface. The fabricated exciplex-type device exhibits a high brightness of 38000 cd/m(2) and a high external quantum efficiency.
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