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Nanocrystalline cubic Y 2 O 3 :Eu were prepared by combustion reaction. The crystal structure and morphology were analyzed by means of X-ray diffraction (XRD) and transmission electron microscopy (TEM). The luminescent properties of the powder were investigated. The charge transfer band position showed redshift from 241 to 251 nm, which was related to the change of the local surroundings...
All of the samples were synthesized by sol-gel methods. Two approaches to charge compensation, (i) 2Ca 2+ →Yb 3+ +M + , where M + is an alkali ion like Li + , Na + and K + , and (ii) indirect charge compensation: 3Ca 2+ →2Yb 3+ +vacancy, were studied in detail. It was found that charge compensation would be very beneficial for...
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