Direct white emissive Cl-doped graphene quantum dots-based flexible film as a single luminophore for remote tunable UV-WLEDs

Wang, Xiao-Fei1,2; Wang, Gui-Gen1,3; Li, Jia-Bing1; Liu, Zheng3; Chen, You-Xiao1; Liu, Long-Fei1; Han, Jie-Cai1,4

2019-04

10.1016/j.cej.2018.12.131

CHEMICAL ENGINEERING JOURNAL   影响因子和分区

1385-8947

1873-3212

Herein we first report new chlorine-doped graphene quantum dots (Cl-GQDs) that can be used in solid-state white-light-emitting diodes (WLEDs). The Cl-GQDs with a mean size of 1.53 nm are obtained by one-step hydrothermal method using beta-cyclodextrin and hydrochloric acid as the source materials. The PL emission spectra of the Cl-GQDs show an excitation-wavelength-dependent behavior in the range from 300 to 380 nm excitation. Under UV irradiation, the Cl-GQDs can direct emit white light. Given that they are worth using in light-conversion, Cl-GQDs embedded solid composite film (Cl-ESCF), based on silicon resin as host material, is successfully fabricated by solution-processing approach. The freestanding Cl-ESCF has high transparency and flexibility, excellent photostability and temperature resistance, and retains its optical properties in the solid state. In order to realize its potential, the Cl-ESCF converted remote UV-pumped WLED is demonstrated. The results verify that the Cl-GQDs can be homogeneously dispersed within solid matrix without obvious aggregation so that a uniform and defect-free natural white light can be obtained. In addition, our WLED possesses favorable white-light characters with the CIE of (0.33, 0.34), moderate CCT of 5653 K, and high CRI of 87.6, as well as good color and LED stability. This single-phase rare-earth-free white-luminescent Cl-GQDs may be not only expected to prevent the drawbacks of multicolor phosphors, thereby generating high-quality white emission, but also identified to be a green alternative for conventional emitters.

Cl-GQDs Solid luminescent film GQD WLEDs Flexibility LED stability

SCI ; EI

英语

其他

China Scholarship Council[201606125092]

Engineering

Engineering, Environmental ; Engineering, Chemical

WOS:000457096400076

ELSEVIER SCIENCE SA

20185206312327

Composite films ; Emission spectroscopy ; Graphene ; Irradiation ; Light emitting diodes ; Luminescence ; Nanocrystals ; Optical properties ; Rare earths

Semiconductor Devices and Integrated Circuits:714.2 ; Light/Optics:741.1 ; Nanotechnology:761 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2

ENGINEERING

Web of Science

1.Harbin Inst Technol, Shenzhen Key Lab Adv Mat, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol, SUSTech Acad Adv Interdisciplinary Studies, Shenzhen 518055, Peoples R China
3.Nanyang Technol Univ, Sch Mat Sci & Engn, Ctr Programmable Mat, Singapore 639798, Singapore
4.Harbin Inst Technol, Ctr Composite Mat, Harbin 150080, Heilongjiang, Peoples R China

Wang, Xiao-Fei,Wang, Gui-Gen,Li, Jia-Bing,et al. Direct white emissive Cl-doped graphene quantum dots-based flexible film as a single luminophore for remote tunable UV-WLEDs[J]. CHEMICAL ENGINEERING JOURNAL,2019,361:773-782.

Wang, Xiao-Fei.,Wang, Gui-Gen.,Li, Jia-Bing.,Liu, Zheng.,Chen, You-Xiao.,...&Han, Jie-Cai.(2019).Direct white emissive Cl-doped graphene quantum dots-based flexible film as a single luminophore for remote tunable UV-WLEDs.CHEMICAL ENGINEERING JOURNAL,361,773-782.

Wang, Xiao-Fei,et al."Direct white emissive Cl-doped graphene quantum dots-based flexible film as a single luminophore for remote tunable UV-WLEDs".CHEMICAL ENGINEERING JOURNAL 361(2019):773-782.