菱形二氧化铈的水热合成及发光机理研究

doi:10.11962/1006-4990.2019-0407

Abstract

Abstract:

Luminescent materials of rhombus CeO₂ was prepared by hydrothermal synthesis method.The crystal structure,morphology,charge state,crystallinity,optical and photoluminescence properties of rhombus CeO₂ were characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,UV-visible spectrophotometer（UV-Vis）,selected area electron diffraction（SAED） and photofluorescence spectrophotometer（PL）.XRD and XPS analysis indicated that there is a large amount of adsorbed oxygen in CeO₂ luminescent material,and the oxygen vacancy concentration of this material was 1.723 7×10 ²⁰ cm ^-3.Optical properties analysis showed that CeO₂ luminescent materials have strong light absorption capacity below 400 nm,and its optical band gap（E_g） value was 3.19 eV.Photoluminescence spectrum analysis showed that four fluorescence emission peaks at 460,470,540,580 nm can be observed under the excitation wavelength of 202 nm,and their chrominance coordinate was（0.188,0.243）.Based on the experimental results and theoretical analysis,the corresponding photolumines-cence mechanism was proposed.

Key words: CeO₂, hydrothermal method, adsorbed oxygen, oxygen vacancy, optical band gap, photoluminescence mechanism

CLC Number:

TQ133.3

Li Xiangguo,Guo Miao,Yao Huimin,Lü Jing. Research on hydrothermal synthesis and photoluminescence mechanism of rhombus CeO₂[J]. Inorganic Chemicals Industry, 2020, 52(6): 30-35.

Figures/Tables 10

References 31

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晶面指数	2θ/ （°）	半高宽/ （°）	晶面间距/nm	晶粒尺寸/nm	晶胞参数a /nm	氧空位浓度/（10²⁰ cm^-3）
（111）	28.915	0.745	0.308 59	10.890	0.534 49	2.615 3
（200）	33.106	0.736	0.267 77	11.135	0.535 54	2.202 0
（220）	47.489	0.956	0.189 78	8.977	0.536 78	1.713 9
（311）	56.718	0.695	0.162 88	12.845	0.540 21	0.363 7
平均值	—	—	—	10.962	0.536 76	1.723 7

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Inorganic Acid-Base-Salt Committee of CIESC

Research on hydrothermal synthesis and photoluminescence mechanism of rhombus CeO₂

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Research on hydrothermal synthesis and photoluminescence mechanism of rhombus CeO2