Acta Photonica Sinica, Volume. 49, Issue 2, 0216001(2020)
Preparation and Mid-infrared Luminescence Properties of Transition Metal Co2+ Doped ZnS Sulfide Nanocrystals
Co2+:ZnS sulfide nanocrystals are prepared by a simplified hydrothermal method without organic materials. These nanocrystals have a cubic sphalerite structure with an average grain size of around 8.3 nm. Mid-infrared fluorescence emissions at 3 400 nm and 4 700 nm were detected under 808 nm laser pumping. By heat treatment at 800℃ in a reducing atmosphere, the prepared nanocrystals transfered to cubic sphalerite and wurtzite mixed crystal forms, and the average grain size increaes to 22.5 nm. After the heat treatment, the nanocrystals possess lower hydroxyl content on surface, therefore exhibit stronger mid-infrared fluorescence. This method is facile and aviods the introduction of organic mid-infrared fluorescence quenching centers during the preparation of Co2+:ZnS nanocrystals. The surface defects and hydroxy content of Co2+:ZnS nanocrystals were reduced and more stronger mid-infrared fluorescence was obtained after heat treatment.
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Chang-xiu WEN, Hua-wei SHI, Mei-ling CHEN, Xu-sheng XIAO, Hai-tao GUO, Xiao-xia CUI. Preparation and Mid-infrared Luminescence Properties of Transition Metal Co2+ Doped ZnS Sulfide Nanocrystals[J]. Acta Photonica Sinica, 2020, 49(2): 0216001
Received: Aug. 19, 2019
Accepted: Oct. 8, 2019
Published Online: Mar. 19, 2020
The Author Email: CUI Xiao-xia (cuixx@opt.ac.cn)