Efficient tandem organic light-emitting diodes with non-doped structures

Yue Qin, Chen Yang Liu, Rui Qing Li, Jiong Wang, Ya Nan Lu, Yue Hua Chen, Yu Zhu Wang, Ya Nan Xu, Xin Wen Zhang, Wei Huang

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Highly efficient tandem organic light-emitting diodes (TOLEDs) were achieved based on a non-doped charge generation unit (CGU) consisting of LiF/Al/C60/4,4’,4”tris(N-3-methylphenyl-N-phenyl-amino) triphenylamine (m-MTDATA) and ultrathin emitting layers. The current–voltage characteristics of the CGU devices and electron-only devices and the capacitance–voltage characteristics of the CGU-based capacitance devices were characterized to explore the charge generation and injection mechanisms. The charge generation process occurs at the interface of C60/m–MTDATA through electron transferring from the highest occupied molecular orbital of m-MTDATA to the lowest unoccupied molecular orbital of C60. It is found that the thinner C60 layer contributes to efficient electron injection. Under the optimal structure, the blue TOLEDs exhibit a maximum current efficiency (CEmax) of 43.3 cd/A. The CEmax and maximum external quantum efficiency (EQEmax) of the white TOLEDs reach 84.6 cd/A and 26.7%, respectively.

Original languageEnglish
Pages (from-to)6450-6453
Number of pages4
JournalChinese Optics Letters
Volume45
Issue number23
DOIs
StatePublished - 1 Dec 2020

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