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Low turn-on voltage and low roll-off rare earth europium-complex based organic light-emitting diodes with exciplex as the host

Abstract

Low turn-on voltage and low roll-off rare earth europium-complex of Eu(DBM)3Phen was achieved based organic light-emitting diodes (OLEDs) by utilizing exciplex of TCTA: Bphen as the host. At the optimal doping concentration of 10%, the device shows pure and sharp emission of Eu3+ and the turn-on voltage, maximum current efficiency and EQE are 2.9 V, 3.85 cd/A and 2.12%, respectively. More important, the roll-off ratio is just 12% from maximum EQE to the EQE at 100 cd/m2. Furthermore, by changing the exciplex host of TCTA: Bphen to thermally activated delayed fluorescence (TADF) exciplex host of mCP: PO-T2T, the turn-on voltage reduced further to 2.5 V and the maximum current efficiency, power efficiency and EQE reach to 5.51 cd/A, 4.94 lm/W and 3.11%, respectively. The barrier-free carrier injection, balanced carrier transport and recombination play a key role in this system. Besides, the TADF mechanism also helps to improve the efficiency, and more detailed discussions are given.

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Publication details

The article was received on 15 Aug 2017, accepted on 06 Nov 2017 and first published on 07 Nov 2017


Article type: Paper
DOI: 10.1039/C7TC03694A
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Low turn-on voltage and low roll-off rare earth europium-complex based organic light-emitting diodes with exciplex as the host

    B. Zhao, H. Zhang, Y. Miao, Z. Wang, L. Gao, H. Wang, Y. Hao, B. Xu and W. Li, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC03694A

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