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Issue 2, 2015
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Flexible quantum dot–PVA composites for white LEDs

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Integration of blue light-emitting diode (LED) chips with yellow phosphors has been the most practical way to achieve white lighting, but finding a low-cost alternative for Y3Al5O12:Ce3+ (YAG:Ce) phosphors, which are expensive and lack red emission, is still a great challenge. The present report documents a strategy of combining quantum dot–polyvinyl alcohol (PVA) composites and blue chips for white LEDs. Cadmium-free and water-soluble ZnSe:Mn/ZnS quantum dots (QDs) were synthesized through a nucleation doping strategy, and then embedded in PVA. The flexible composite contains well-dispersed QDs and exhibits highly efficient photoluminescence at 590–635 nm, and hence is available for resin-free white LEDs. Besides excellent stability, the assembled white LEDs possess promising color characteristics, including a color rendering index (CRI) value of 93.5, a correlated color temperature (CCT) of 2913 K at Commission Internationale de l'Eclairage (CIE) color coordinates of (0.41,0.37), and a luminous efficacy (LE) of 18.9 lm W−1 under 300 mA current excitation. This work demonstrates that such a silica-coated QD–PVA composite plate, as a reliable color converter, would be promising for the next-generation QD-based LEDs.

Graphical abstract: Flexible quantum dot–PVA composites for white LEDs

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The article was received on 08 Oct 2014, accepted on 13 Nov 2014 and first published on 14 Nov 2014

Article type: Communication
DOI: 10.1039/C4TC02256D
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J. Mater. Chem. C, 2015,3, 257-264

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    Flexible quantum dot–PVA composites for white LEDs

    A. Cosgun, R. Fu, W. Jiang, J. Li, J. Song, X. Song and H. Zeng, J. Mater. Chem. C, 2015, 3, 257
    DOI: 10.1039/C4TC02256D

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