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

Yuanfei Ding; Jingxia Zheng; Junli Wang; Yongzhen Yang; Xuguang Liu

doi:10.1039/C8TC04887H

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

Yuanfei Ding,

^ab Jingxia Zheng,^ab Junli Wang,^ab Yongzhen Yang

*^ab and Xuguang Liu*^ac

Author affiliations

* Corresponding authors

^a MOE Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Taiyuan 030024, China
E-mail: yyztyut@126.com, liuxuguang@tyut.edu.cn

^b Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China

^c College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

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.

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DOI: https://doi.org/10.1039/C8TC04887H
Article type: Paper
Submitted: 27 Sep 2018
Accepted: 04 Dec 2018
First published: 13 Dec 2018

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J. Mater. Chem. C, 2019,7, 1502-1509

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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, 7, 1502 DOI: 10.1039/C8TC04887H

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Journal of Materials Chemistry C

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

Abstract

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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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