Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/85368
Title: Towards high-powered remote WLED based on flexible white-luminescent polymer composite films containing S, N co-doped graphene quantum dots
Authors: Wang, Xiao-Fei
Wang, Gui-Gen
Li, Jia-Bing
Liu, Zheng
Zhao, Wen-Feng
Han, Jie-Cai
Keywords: S,N-GQDs
Luminescent Composite Films
Engineering::Materials
Issue Date: 2017
Source: Wang, X.-F., Wang, G.-G., Li, J.-B., Liu, Z., Zhao, W.-F., & Han, J.-C. (2018). Towards high-powered remote WLED based on flexible white-luminescent polymer composite films containing S, N co-doped graphene quantum dots. Chemical Engineering Journal, 336, 406-415. doi:10.1016/j.cej.2017.12.056
Series/Report no.: Chemical Engineering Journal
Abstract: In this article, a new application of using S, N co-doped graphene quantum dots (S, N-GQDs) as ideal color converters in solid-state white light-emitting diode (WLED) is reported. To this end, the S, N-GQDs with an average diameter of ∼4.46 nm are obtained by a hydrothermal approach using citric acid and thiourea as source materials. The PL spectra of S, N-GQDs show an excitation-independent behavior in the range of 300–380 nm. Under UV illumination, the S, N-GQDs display intense blue-light with the quantum yield of 51.2%. The PL mechanism is also investigated. Then, we fabricate freestanding luminescent composite films in a solution casting method by combining S, N-GQDs with YAG:Ce3+ phosphors based on a polyvinyl alcohol (PVA) matrix. The luminescent films have superior foldability and photostability and excellent heat resistance, and retain their optical performances in the solid-state. To realize their potential, a high-powered remote WLED has been demonstrated. The results indicate that S, N-GQDs and YAG:Ce3+ can be homogeneously dispersed in the PVA without aggregation so that uniform white-light emission can be obtained. These composite films containing S, N-GQDs are promising to be used in state-of-the-art UV-pumped remote WLED according to their wide wavelength emission and collapsible illumination device.
URI: https://hdl.handle.net/10356/85368
http://hdl.handle.net/10220/49213
ISSN: 1385-8947
DOI: 10.1016/j.cej.2017.12.056
Rights: © 2017 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles

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