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MAPbBr3:Poly(ethylene oxide) Composite Perovskite Quantum Dot Emission Layer: Enhanced Film Stability, Coverage and Device Performance

Abstract

Metal halide perovskite quantum dots (PQDs) have become the most promising optoelectronic material in the new generation display and lighting device due to its excellent optical properties. However, their stability and surface defects have affected their large-scale applications. We demonstrate enhanced stability of high-surface-area colloidal PQDs encapsulated with long-chain organic polymer poly(ethylene oxide) (PEO) via simply mixing the PQDs with this high molecular-weight polymer. The introduction of the polymer deactivates the surface defects of PQDs and sufficiently protects the organic ligands on the surfaces of PQDs with obviously improved ambient stability and photoluminescence quantum yield. Moreover, the use of PEO efficiently confines electrons within the PQDs emission layer and generates extremely stable green electroluminescent spectra in MAPbBr3 light-emitting diodes (LEDs) over a wide voltage operation range of 5-12 V, accompanied by significant improvements on external quantum efficiencies with enhancement factors of 18.3 times. Our work provides a robust platform for the fabrication of stable PQDs, high-quality PQDs film and efficient PQDs-based LEDs.

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Publication details

The article was received on 21 Dec 2018, accepted on 07 Apr 2019 and first published on 08 Apr 2019


Article type: Paper
DOI: 10.1039/C8NR10298H
Citation: Nanoscale, 2019, Accepted Manuscript

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    MAPbBr3:Poly(ethylene oxide) Composite Perovskite Quantum Dot Emission Layer: Enhanced Film Stability, Coverage and Device Performance

    H. Yu, Y. Lu, Z. Feng, Y. Wu, Z. Liu, P. Xia, J. Qian, Y. Chen, L. Liu, K. Cao, S. Chen and W. Huang, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C8NR10298H

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