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Issue 25, 2017
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Combined optimization of emission layer morphology and hole-transport layer for enhanced performance of perovskite light-emitting diodes

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Abstract

Electroluminescence performance of perovskite light-emitting diodes (PeLEDs) is extremely dependent on the morphology of the perovskite films, which is influenced by the processing method. Herein, we report an effective approach for the preparation of a high-quality perovskite film with perfect performance for PeLEDs via a solution process at room temperature. On the one hand, CH3NH3PbBr3 (MAPbBr3) precursor solution was blended with a traditional polymeric host PVK [poly(vinylcarbazole)] to obtain smooth and uniform perovskite films. On the other hand, the perovskite films could be further improved through crystal modification to obtain a more uniform morphology and smaller grain sizes. Our research also demonstrated the feasibility of preparing high-performance solution-processed PeLEDs by blending small molecule hole-transport materials (HTMs) with polymer HTMs (widely used in OLEDs as hole-transport layers (HTLs)). Efficient green PeLEDs with a current efficiency (CE) of 6.7 cd A−1, external quantum efficiency (EQE) of 1.88%, and low turn-on voltage of 2.9 V were achieved; this indicates that the effective solution process used to improve the morphology of the perovskite films as well as carrier injection has great potential for the development of high-performance PeLEDs.

Graphical abstract: Combined optimization of emission layer morphology and hole-transport layer for enhanced performance of perovskite light-emitting diodes

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Supplementary files

Article information


Submitted
18 Mar 2017
Accepted
18 May 2017
First published
19 May 2017

J. Mater. Chem. C, 2017,5, 6169-6175
Article type
Paper

Combined optimization of emission layer morphology and hole-transport layer for enhanced performance of perovskite light-emitting diodes

F. Meng, C. Zhang, D. Chen, W. Zhu, H. Yip and S. Su, J. Mater. Chem. C, 2017, 5, 6169
DOI: 10.1039/C7TC01155E

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