摘要
根据光致发光光谱和吸收光谱研究了氧化石墨烯(GO)的发光性能。结果表明,GO的发光源于片层内的sp^(2)C团簇。sp^(2)C团簇被高势垒的氧化官能团(sp^(3)C)包围,形成了多量子阱结构。GO内有不同尺寸的sp^(2)C团簇,其带隙与尺寸相关,尺寸越小带隙越宽,使发光覆盖范围较宽并依赖激发波长。还改变激发波长和温度,根据发光光谱研究了GO中不同局域态的发光行为。结果表明,514 nm激发的sp^(2)C团簇的热激活能比830 nm激发的高56 MeV。温度对较小尺寸sp^(2)C团簇的影响较小,因为尺寸越小限域效应越强,使电子空穴对的辐射跃迁几率提高。
The luminescence properties of GO were investigated by means of photoluminescence spectra and absorption spectra.It follows that the luminescence of GO originates from sp^(2)C clusters in lamellar.Sp^(2)C clusters are surrounded by high barrier oxidation functional groups(sp^(3)C),forming a multiquantum well structure.There are sp^(2)C clusters of different sizes in GO,and the band gap is related to the size.The smaller the size,the wider the band gap,so that the luminous coverage is wider and depends on the excitation wavelength.The emission behavior of different local states in GO was investigated by changing the excitation wavelength and temperature.The results show that the thermal activation energy of sp^(2)C clusters excited by 514 nm was 56 MeV higher than that excited by 830 nm.Temperature has little effect on smaller sp^(2)C clusters,because the smaller the size,the stronger the confinement effect and the radiative transition probability of electron hole pair is increased.
作者
李福禄
韩春淼
高嘉望
蒋健
许卉
李冰
LI Fulu;HAN Chunmiao;GAO Jiawang;JIANG Jian;XU Hui;LI Bing(College of Physics,Changchun Normal University,Changchun 130032,China;Department of Ophthalmology,the First Hospital of Jilin University,Changchun 130021,China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2022年第8期597-601,共5页
Chinese Journal of Materials Research
基金
国家自然科学基金(11404036)
吉林省科技厅自然科学基金(20210101164JC)
吉林省教育厅科学技术研究项目(JJKH20220824KJ)
长春师范大学自然科学基金(2020-010)。
关键词
无机非金属材料
低维碳材料
氧化石墨烯
发光光谱
inorganic non-metallic materials
low dimensional carbon materials
graphene oxide
luminescence spectrum
