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Highly Efficient Carbon Dots and Their Nanohybrids for Trichromatic White LEDs

Abstract

Carbon dots (CDs) are hotspot materials in the lighting and displaying fields due to their low toxicity, high photostability and the ease of functionalization. However, since CDs with high photoluminescence quantum yield are limited in blue band and the red emission CDs (R-CDs) with excellent photoluminescence intensity are absent, the development of white LEDs was seriously restricted. In this work, we prepared alkali induced R-CDs with quantum yield as high as 80%. The optical properties of R-CDs are accordingly modulated due to the alkali induced surface electronic states. The R-CDs were doped into amino silane to realize highly efficient solid state red luminescence. The R-CDs were used to combine with N-(2-aminoethyl)-3-aminopropyltrimethoxysilane functionalized green emissive CDs (G-SiCDs) with quantum yield of 49% to fabricate G-SiCDs/R-CDs gel-glasses with tunable color gamut. The G-SiCDs/R-CDs nanohybrids showed excellent transmittance and thermal stability for using in WLEDs. As a demonstration, a trichromatic warm WLED was built which displayed a luminous efficiency of 68.58 lm W-1 and a CRI of 90.2. The characteristics are satisfied for the requirement for indoor lighting.

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Publication details

The article was received on 09 Apr 2018, accepted on 08 May 2018 and first published on 08 May 2018


Article type: Paper
DOI: 10.1039/C8TC01659C
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Highly Efficient Carbon Dots and Their Nanohybrids for Trichromatic White LEDs

    B. Yuan, Z. Xie, P. Chen and S. Zhou, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC01659C

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