Investigation of the red-shift of the emission of microwave solvothermally-grown europium doped calcium sulphide crystals

A distinct red-shift to 660 nm-featured longer wavelength of europium doped calcium sulphide nanocrystals was observed in a microwave （MW）-assisted solvothermal synthesis procedure. This red-shift was probably due to a combined effect from Mg^2＋ codoping and strain accumulation at grain boundaries....

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Published inJournal of rare earths Vol. 32; no. 8; pp. 702 - 708
Main Author 董晓菲 陆启飞 卢志娟 毛智勇 王达健
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.08.2014
Subjects
Calcium sulfides
Calcium sulphide
Crystals
Europium
Grain boundaries
microwave
Microwaves
rare earth ion
Rare earth metals
solvothermal
Synthesis
Wavelengths
发光晶体
发射
微波
溶剂热
热生长
硫化钙
红移
铕掺杂
calcium sulphide
solvothermal
rare earth ion
microwave
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ISSN1002-0721
2509-4963
DOI10.1016/S1002-0721(14)60129-0

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Summary:A distinct red-shift to 660 nm-featured longer wavelength of europium doped calcium sulphide nanocrystals was observed in a microwave （MW）-assisted solvothermal synthesis procedure. This red-shift was probably due to a combined effect from Mg^2＋ codoping and strain accumulation at grain boundaries. The latter originated from the formation of small grains with an average size of around 200 nm in micrometer sized crystals upon Mg^2＋ codoping. In particular, MW electromagnetic field suppressed grain growth and enabled a reconstruction of atoms at the inner grain boundary at which the field strength was intensified around rare earth ions in host lattices. This MW synthesis route provided an option to prepare luminescent crystals with the desired blue-excitable longer wavelength emission.
Bibliography:11-2788/TF
A distinct red-shift to 660 nm-featured longer wavelength of europium doped calcium sulphide nanocrystals was observed in a microwave （MW）-assisted solvothermal synthesis procedure. This red-shift was probably due to a combined effect from Mg^2＋ codoping and strain accumulation at grain boundaries. The latter originated from the formation of small grains with an average size of around 200 nm in micrometer sized crystals upon Mg^2＋ codoping. In particular, MW electromagnetic field suppressed grain growth and enabled a reconstruction of atoms at the inner grain boundary at which the field strength was intensified around rare earth ions in host lattices. This MW synthesis route provided an option to prepare luminescent crystals with the desired blue-excitable longer wavelength emission.
DONG Xiaofei, LU Qifei, LU Zhijuan , MAO Zhiyong , WANG Dajian（Institute of Materials Physics, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China）
rare earth ion; calcium sulphide; microwave; solvothermal
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ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(14)60129-0