Issue 27, 2021

Highly efficient ultra-flexible tandem organic light-emitting diodes adopting a non-doped charge generation unit

Abstract

Due to the voltage division of charge generation unit (CGU), the power efficiency of tandem organic light-emitting diodes (TOLEDs) is usually lower than that of the single-unit devices, which severely restricts the development and application of TOLEDs. Here, a significant improvement in power efficiency of TOLEDs is presented through adopting a non-doped CGU of LiF/Al/fullerene (C60)/1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile (HAT-CN)/N,N′-diphenyl-N,N′-bis(1-naphthyl)-1,1′-biphenyl-4,4′-diamine (NPB). The characteristics of current–voltage and impedance spectroscopy reveal that the non-doped CGU possesses fabulous charge generation and injection capabilities. The ultra-flexible tandem white OLEDs display a maximum power efficiency of 59 lm W−1, which is 32% higher than that of single white OLEDs. What's more meaningful, the ultra-flexible devices have good mechanical flexibility and durability. After being bent for 3000 cycles at a radius of ∼3 mm, the devices retain ∼90% of the original luminance.

Graphical abstract: Highly efficient ultra-flexible tandem organic light-emitting diodes adopting a non-doped charge generation unit

Supplementary files

Article information

Article type
Paper
Submitted
12 Mar 2021
Accepted
02 Jun 2021
First published
03 Jun 2021

J. Mater. Chem. C, 2021,9, 8570-8578

Highly efficient ultra-flexible tandem organic light-emitting diodes adopting a non-doped charge generation unit

J. Wang, Y. Wang, Y. Qin, R. Li, J. An, Y. Chen, W. Lai, X. Zhang and W. Huang, J. Mater. Chem. C, 2021, 9, 8570 DOI: 10.1039/D1TC01157J

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