Energy transfer and upconversion luminescence properties of Y2O3 : Sm and Gd2O3 : Sm phosphors
Data(s) |
2003
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Resumo |
Y2O3:Sm and Gd2O3:Sm powder phosphors were prepared by carbonate coprecipitation method. The purified crystalline phases of Y2O3:Sm and Gd2O3:SM were obtained at 600degreesC, and the crystallinity increases with increase in annealing temperature. Both samples contain aggregated phosphor particles. An energy transfer (ET) from Y2O3 and Gd2O3 hosts to sm(3+) has been observed, and the ET efficiency in the latter is higher than that in the former because an energy migration process like Gd3+-(Gd3+)(n)-Sm3+ has occurred in the latter. Furthermore, an upconversion luminescence from the (4)G(5/2) level of Sm3+ has been observed in both Y2O3 and Gd2O3 under the excitation of 936 nm infrared, whose mechanisms are proposed. Both the up and downconversion emission intensities of Sm3+ in Gd2O3 are stronger than those in Y2O3. |
Identificador | |
Idioma(s) |
英语 |
Fonte |
Zhou YH;Lin J;Wang SB.Energy transfer and upconversion luminescence properties of Y2O3 : Sm and Gd2O3 : Sm phosphors,JOURNAL OF SOLID STATE CHEMISTRY,2003,171(1-2 ):391-395 |
Palavras-Chave | #DOPED YTTRIUM-OXIDE #IONS |
Tipo |
期刊论文 |