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Research Article

Synthesis of CsPbX3 (X = Cl/Br, Br, and Br/I)@SiO2/PMMA composite films as color-conversion materials for achieving tunable multi-color and white light emission

Varnakavi Naresh1( ), Byung Hyo Kim2, Nohyun Lee1( )
School of Advanced Materials Engineering, Kookmin University, Seoul 02707, Republic of Korea
Department of Organic Materials and Fiber Engineering, Soongsil University, Seoul 06978, Republic of Korea
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Abstract

All-inorganic cesium lead halide based perovskite nanocrystals (PNCs) exhibit promising optoelectronic properties, but their poor stability and anion exchange reaction limit their broad commercial applications. Herein, we demonstrated the successful synthesis of blue-green-red emitting CsPbX3 (X = Cl/Br, Br, and Br/I) PNCs via hot injection method, followed by silica-coating and embedding in poly(methylmethacrylate) (PMMA) matrix. The photoluminescence (PL) spectra of SiO2/PMMA-coated PNCs can be tuned continuously by regulating precursor composition ratio, from blue (CsPb(Cl0.5/Br0.5)3; 460 nm) to red (CsPb(Br0.4/I0.6)3 via green (CsPbBr3; 519 nm). The PNCs composite films exhibit improved stability (thermal-, moisture-, and photo-stability) because of the barrier formed by SiO2/PMMA coating and also displayed exceptional photoluminescent quantum yield (PLQY of blue, green, and red-emitting SiO2/PMMA coated PNCs are 37%, 86%, and 71%, respectively) with longer lifetimes inhibiting anion exchange. Eventually, the PNCs-encapsulated SiO2/PMMA composite films were integrated into the UV LED chip as down-converting materials to construct a prototype white-peLED unit. The designed white-peLED unit demonstrated bright white light generating CIE coordinates (0.349, 0.350), a luminous efficiency (LE) of 39.2% and a color rendering index (CRI) of 84.7. The wide color gamut of 121.47% of NTSC and 98.56% of Rec. 2020 is also achieved with the built w-LED system. Therefore, the results demonstrated that CsPbX3 (X = Cl/Br, Br, and Br/I) PNCs@SiO2/PMMA composite films can be employed as efficient UV to visible color conversion materials for white-LEDs and backlighting.

Keywords

lead halide perovskite nanocrystalshot-injection methodlong term stabilityPL quantum yieldSiO2/PMMA encapsulationwhite peLED performance

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Nano Research
Volume 14 Issue 4,
April 2021
Pages 1187-1194
DOI: 10.1007/s12274-020-3170-5
Cite this article:
Naresh V, Kim BH, Lee N. Synthesis of CsPbX3 (X = Cl/Br, Br, and Br/I)@SiO2/PMMA composite films as color-conversion materials for achieving tunable multi-color and white light emission. Nano Research, 2021, 14(4): 1187-1194. https://doi.org/10.1007/s12274-020-3170-5
Topics:
Bromine compoundsCesium compoundsChlorine compoundsCoatings Lead compoundsLight emitting diodes PerovskiteSilicaSilicon

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Received: 30 June 2020
Revised: 16 September 2020
Accepted: 10 October 2020
Published: 15 November 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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