Quenching mechanism of Er^(3+) emissions in Er^(3+)-and Er^(3+)/Yb^(3+)-doped SrAl_(12)O_(19) nanophosphors  

作　　者：闫武钊 陈永虎 尹民 

机构地区：[1]Department of Physics,University of Science and Technology of China

出　　处：《Journal of Rare Earths》2011年第3期202-206,共5页稀土学报（英文版）

基　　金：supported by National Natural Science Foundation of China(10774140,11011120083);Knowledge Innovation Project of the Chinese Academy of Sciences(KJCX2-YW-M11);Special Foundation for Talents of Anhui Province,China(2007Z021)

摘　　要：Nanoscaled SrAl12O19：Er3＋ and SrAl12O19：Yb3＋,Er3＋ phosphors were synthesized by a combustion method.The emission intensities of every sample were compared by a new method with the emission of codoped Gd3＋ ions as a reference.Compared with their bulk material prepared by the solid-state reaction method,a higher Er3＋ quenching concentration,as high as 20%,was observed in the nanoscaled phosphors for both visible（VIS） and near infrared（NIR） emissions.The higher quenching concentration in both VIS and NIR regions for nanoscaled samples are related to the structure characteristics of the nano particles.The influence of the introduction of Yb3＋ ions on the emission spectra intensity was also investigated and discussed.Nanoscaled SrAl12O19：Er3＋ and SrAl12O19：Yb3＋,Er3＋ phosphors were synthesized by a combustion method.The emission intensities of every sample were compared by a new method with the emission of codoped Gd3＋ ions as a reference.Compared with their bulk material prepared by the solid-state reaction method,a higher Er3＋ quenching concentration,as high as 20%,was observed in the nanoscaled phosphors for both visible（VIS） and near infrared（NIR） emissions.The higher quenching concentration in both VIS and NIR regions for nanoscaled samples are related to the structure characteristics of the nano particles.The influence of the introduction of Yb3＋ ions on the emission spectra intensity was also investigated and discussed.

关 键 词：ERBIUM YTTERBIUM GADOLINIUM SrAl12O19 near infrared nanoscaled phosphor rare earths 

分 类 号：TB383.1[一般工业技术—材料科学与工程]