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Issue 15, 2019
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Interfacial engineering for highly efficient quasi-two dimensional organic–inorganic hybrid perovskite light-emitting diodes

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Abstract

Metal halide-based perovskites are regarded as promising candidates for light-emitting diodes (LEDs) owing to their high color purity, tunable bandgap and solution processability. However, poor active-layer morphology and non-radiative charge recombination are still the main obstacles for practical use in displays and lighting. Here, we report a facile method to achieve high-performance green emitting perovskite light-emitting diodes (PeLEDs) by inserting an interface buffer layer (BL) based on an amphipathic conjugated molecule, betaine. We show evidence that the betaine layer controls the grain size of the perovskite and hence increases the crystalline nucleation sites, which ultimately leads to a high photoluminescence quantum yield (PLQY) and a device with an external quantum efficiency (EQE) of 11.1%. In addition, the current leakage is significantly reduced due to the high quality crystallization of the thin film. These results indicate that the interface BL is an effective strategy to boost the efficiency of PeLEDs.

Graphical abstract: Interfacial engineering for highly efficient quasi-two dimensional organic–inorganic hybrid perovskite light-emitting diodes

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Supplementary files

Article information


Submitted
23 Dec 2018
Accepted
19 Feb 2019
First published
21 Feb 2019

J. Mater. Chem. C, 2019,7, 4344-4349
Article type
Paper

Interfacial engineering for highly efficient quasi-two dimensional organic–inorganic hybrid perovskite light-emitting diodes

Q. Liu, S. Yuan, S. Sun, W. Luo, Y. Zhang, L. Liao and M. Fung, J. Mater. Chem. C, 2019, 7, 4344
DOI: 10.1039/C8TC06490C

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