摘要
以柠檬酸为络合剂,用溶胶-凝胶法制备出纳米级上转换发光粉SrMoO4∶Yb,Er。XRD、TEM确定了样品SrMoO4∶Yb,Er是四方晶系,其粒径约为70nm,属于多晶。实验表明:用980nmLD对其进行激发,在室温下观察到了526,548nm附近的绿光发射和652nm附近微弱的红光发射,分别对应于Er3+离子2H11/2→4I15/2,4S3/2→4I15/2和4F9/2→4I15/2的跃迁;当n(Yb)/n(Er)为7∶1时,上转换发光强度最强。由激发功率与发光强度的关系得出绿光和红光发射均为双光子过程。
SrMoO4： Yb, Er nano-sized up-conversion luminescent powder was prepared by sol-gel method in the presence of citric acid. The impact of different proportion of Yb^3＋ to Er^3＋ on the up-conversion luminescent intensity was discussed. The experiment showed that when the proportion of Yb^3＋ to Er^3＋ is 7：1, the upconversion luminescent intensity is the strongest. The sample was characterized via XRD, TME and emission spectrum. The results showed that SrMoO4： Yb, Er belongs to pyramidal system; the grain size of SrMoO4： Yb, Er is under 100 nm, and belongs to polycrystals. Under 980 nm laser diode （LD） excitation, two strong green emissions and a wake red emission, which centered around 526, 558, 652 nm, respectively, are ob- served at room temperature. They correspond to ^2H11/2→^4I15/2,^4S3/2→^4I15/2 and ^4F9/2→^4I15/2 transitions of Er^3＋ ion, respectively. According to the relationship between pump power and luminescent intensity, it was concluded that the both the green and the red emission all are dominated by two-photon process.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2008年第6期1055-1058,共4页
Chinese Journal of Luminescence
