科研之友
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摘要
Site occupation in SrAl2O4 was probed just by doping Pb2+ ion, and a new route to investigate site occupation in luminescence materials was put forward. SrAl2O4:Pb2+ samples obtained through sol-gel method were investigated and its excitation spectrum had two bands at lower temperatures. These two bands are closely related to two Sr sites. Environment factor he of two S-r sites were calculated and the energy E-A of Pb2+ were obtained making use of our pre-bulit empitical formula, i.e. E-A = 7.223-3.271h(e). It was concluded that the excitation band peaking at 253 nm is from Sr(1) site and the excitation band peaking at 264 nm Sr(2) site. There is one possibility that using Pb2+ ion as site probe in SrAl2O4 host or other host materials.
