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Issue 47, 2018
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Highly efficient wide-color-gamut QD-emissive LCDs using red and green perovskite core/shell QDs

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Abstract

The development of highly efficient and stable red (R) CsPb(Br0.35I0.65)3/CsPb2Br5 and green (G) CsPbBr3/CsPb2Br5 core/shell perovskite quantum dots (PeQDs) can facilitate the realization of highly efficient and wide-color-gamut, PeQD-emissive liquid crystal displays (LCDs). The photoluminescence quantum yields (PLQYs) of red and green (RG) core/shell PeQDs reached ∼77.4% and ∼78.9%, respectively. The enhanced photo-stability, water-resistance, and thermal stability of RG core/shell PeQD films imply more opportunities to fabricate RG color-converting films with it to replace color filters (CFs) in conventional LCDs. The realization of color-by-blue PeQD-emissive LCDs can overcome technical challenges related to conventional CF-assisted LCDs, such as improved device efficiency and an enlarged color gamut. The relative conversion efficiency and color gamut of a color-by-blue PeQD-emissive LCD consisting of RG PeQD films sandwiched in the form of a RG-recycling bottom layer and a blue-filtering top dichroic filter are 1.94 times higher and 1.74 times wider than those of a conventional CF-LCD with a 2-phosphor-converted white-light-emitting diode (2pc-WLED). Therefore, the overall enhanced efficiency of PeQD-emissive LCDs was determined to be 4.28 times higher than that of a conventional 2pc-WLED-based CF-LCD. This color-by-blue core/shell PeQD-emissive LCD provides an excellent opportunity for the creation of new types of highly efficient LCDs.

Graphical abstract: Highly efficient wide-color-gamut QD-emissive LCDs using red and green perovskite core/shell QDs

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Publication details

The article was received on 07 Sep 2018, accepted on 08 Nov 2018 and first published on 12 Nov 2018


Article type: Paper
DOI: 10.1039/C8TC04537B
J. Mater. Chem. C, 2018,6, 13023-13033

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    Highly efficient wide-color-gamut QD-emissive LCDs using red and green perovskite core/shell QDs

    H. C. Yoon, H. Lee, H. Kang, J. H. Oh and Y. R. Do, J. Mater. Chem. C, 2018, 6, 13023
    DOI: 10.1039/C8TC04537B

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