Effect of UV irradiation on photoluminescence of carbon dots

被引：28
|
作者：
Tan, Dezhi [1 ]
Zhou, Shifeng [2 ,3 ]
Shimotsuma, Yasuhiko [4 ]
Miura, Kiyotaka [4 ]
Qiu, Jianrong [1 ,2 ,3 ]
机构：
[1] Zhejiang Univ, Dept Mat Sci & Engn, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China
[2] S China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangzhou, Guangdong, Peoples R China
[3] S China Univ Technol, Inst Opt Commun Mat, Guangzhou, Guangdong, Peoples R China
[4] Kyoto Univ, Grad Sch Engn, Dept Chem Mat, Kyoto 6158510, Japan
来源：
OPTICAL MATERIALS EXPRESS | 2014年 / 4卷 / 02期
基金：
中国国家自然科学基金;
关键词：
GRAPHENE QUANTUM DOTS; NANOPARTICLES; LUMINESCENCE; EXCITATION; NANODOTS; SIZE;
D O I：
10.1364/OME.4.000213
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Effect of ultraviolet light irradiation on the photoluminescence of carbon dots (CDs) is investigated. After the ultraviolet light irradiation, CDs exhibit red shifted and enhanced green emission, and significantly enhanced emission in the wavelength region from green-yellow to red. Carbonyl groups increase remarkably originated from photochemical oxidation, resulting in more defect energy trapping (DET) states, higher electron density, and stronger n(OH)->pi*(CO) interactions. Consequently, a decrease in band gap and more contribution from the DET states related radiative recombination result in an enhancement of green emission and beyond, while ultraviolet emission is reduced and blue shifted due to the decrease of sp(2) carbons. (C) 2014 Optical Society of America
引用
收藏
页码：213 / 219
页数：7
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