稀土学报(英文版)
稀土學報(英文版)
희토학보(영문판)
JOURNAL OF RARE EARTHS
2004年
1期
40-44
,共5页
徐美%董宁%孔庆妍%张慰萍%尹民%夏上达
徐美%董寧%孔慶妍%張慰萍%尹民%夏上達
서미%동저%공경연%장위평%윤민%하상체
optics%combustion synthesis%nanocrystalline Gd2O3∶Eu%photoluminescence%concentration quenching%rare earths
Nanocrystalline monoclinic and cubic Gd2O3∶Eu with different Eu3+ concentration were prepared using glycine-nitrate combustion synthesis. By changing the ratio of glycine to nitrate and proper heat treatment, pure monoclinic and cubic Gd2O3∶Eu with particle size less than 40 nm can be easily formed. Under ultraviolet excitation, main emission of Eu3+(5D0→7F2) locates at 624 nm in monoclinic Gd2O3∶Eu and 611 nm in cubic sample. In excitation spectrum two broad bands corresponding to the host absorption and charge transfer state(CTS) and f-f transitions of Gd3+ and Eu3+ were observed and discussed. The quenching concentration of monoclinic and cubic Gd2O3∶Eu is 10% and 15%, respectively, both of which are much higher than that of bulk Gd2O3∶Eu.
