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Single Component Mn-doped Perovskite-related CsPb2ClxBr5-x Nanoplatelets with A Record White Light Quantum Yield of 49%: A New Single Layer Color Conversion Material for Light-emitting Diodes

Abstract

Single component nanocrystals (NCs) with white fluorescence are promising single layer color conversion media for white light-emitting diodes (LED) due to avoiding of the undesirable changes of chromaticity coordinates for the mixture of blue, green and red emitted NCs. However, their practical applications have been hindered by the relative low photoluminescence (PL) quantum yield (QY) for traditional semiconductor NCs. Though Mn-doped perovskite nanocube is a potential candidate, it can not realize a white-light emission until now. In this work, the synthesis of Mn-doped 2D perovskite-related CsPb2ClxBr5-x nanoplatelets with a pure white emission from single component is reported. Unlike Mn-doped perovskite nanocubes with insufficient energy transfer efficiency, the current reported Mn-doped 2D perovskite-related CsPb2ClxBr5-x nanoplatelets show a 10 times higher energy transfer efficiency from perovskite to Mn impurities at the required emission wavelengths (about 450 nm for perovskite emission and 580 nm for Mn emission). As a result, the Mn/perovskite dual emission intensity ratio surprisingly elevates from less than 0.25 in case of Mn-doped nanocubes to 0.99 in the current Mn-doped CsPb2ClxBr5-x nanoplatelets, giving rise to a pure white light emission with Commission Internationale de l'Eclairage (CIE) color coordinates of (0.35, 0.32). More importantly, the highest PL QY for Mn-doped perovskite-related CsPb2ClxBr5-x nanoplatelets is up to 49%, which is a new record for white-emitted nanocrystals with single component. These highly luminescent nanoplatelets can be blended with polystyrene (PS) without changing the white light emission but dramatically improving perovskite stability. The perovskite-PS composites are available not only as a good solution processable coating material for assembling LED, but also as a superior conversion material for achieving white light LED with a single conversion layer.

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Publication details

The article was received on 02 Sep 2017, accepted on 13 Oct 2017 and first published on 13 Oct 2017


Article type: Paper
DOI: 10.1039/C7NR06538H
Citation: Nanoscale, 2017, Accepted Manuscript
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    Single Component Mn-doped Perovskite-related CsPb2ClxBr5-x Nanoplatelets with A Record White Light Quantum Yield of 49%: A New Single Layer Color Conversion Material for Light-emitting Diodes

    C. Wang, H. Wu, S. xu, H. Shao, L. Li and Y. Cui, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR06538H

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