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Direct blending of multicolor carbon quantum dots into fluorescent films for white light emitting diodes with an adjustable correlated color temperature

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Abstract

White light-emitting diodes (WLEDs) with a high color rendering index (CRI) and an adjustable correlated color temperature (CCT) are of great importance in a wide range of fields. We report an efficient method to fabricate WLEDs with prominent CCT performance by the combination of multi-colour carbon quantum dots (CQDs). Long-wavelength CQDs with green, yellow and orange emission (denoted as G-, Y-, and O-CQDs, respectively) were obtained by a one-pot solvothermal reaction between phthalic acid and o-phenylenediamine followed by precise separation by silica column chromatography. Systematic investigation and detailed characterization demonstrate that G- and Y-CQDs emit mainly due to the quantum size effect, while the photoluminescence emission of O-CQDs is mainly derived from surface defect states formed by surface oxidation. Subsequently, solid-state luminous red-green-blue CQD films obtained by using tri-functional blue emitting CQDs (phosphors, dispersants and curing agents) lead to UV-pumped WLEDs with good color stability and a high CRI (83–88) as well as an adjustable CCT (3466–7368 K). This work has opened up new avenues for the development of low-cost, environmentally-friendly and high-performance CQD phosphor-based WLEDs.

Graphical abstract: Direct blending of multicolor carbon quantum dots into fluorescent films for white light emitting diodes with an adjustable correlated color temperature

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Publication details

The article was received on 27 Sep 2018, accepted on 04 Dec 2018 and first published on 13 Dec 2018


Article type: Paper
DOI: 10.1039/C8TC04887H
Citation: J. Mater. Chem. C, 2019, Advance Article
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    Direct blending of multicolor carbon quantum dots into fluorescent films for white light emitting diodes with an adjustable correlated color temperature

    Y. Ding, J. Zheng, J. Wang, Y. Yang and X. Liu, J. Mater. Chem. C, 2019, Advance Article , DOI: 10.1039/C8TC04887H

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