Deep-blue organic light-emitting diodes based on a doublet d-f transition cerium(III) complex with 100% exciton utilization efficiency.

ABSTRACT: Compared to red and green organic light-emitting diodes (OLEDs), blue OLEDs are still the bottleneck due to the lack of efficient emitters with simultaneous high exciton utilization efficiency (EUE) and short excited-state lifetime. Different from the fluorescence, phosphorescence, thermally activated delayed fluorescence (TADF), and organic radical materials traditionally used in OLEDs, we demonstrate herein a new type of emitter, cerium(III) complex Ce-1 with spin-allowed and parity-allowed d-f transition of the centre Ce³⁺ ion. The compound exhibits a high EUE up to 100% in OLEDs and a short excited-state lifetime of 42 ns, which is considerably faster than that achieved in efficient phosphorescence and TADF emitters. The optimized OLEDs show an average m

SUBMITTER: Wang L 

PROVIDER: S-EPMC7477100 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature