Photoluminescence and thermal sensitivity properties of La6W2O15:Er3+
La6W2O15:Er3+phosphor were prepared by high temperature solid state reaction,and the temperature sensing characteristics of the thermally coupled and non-thermally coupled levels were analyzed.The results show that the best doping concentration of La6W2O15:Er3+phosphor is 1.5%,the best excitation position is 380nm,and there are three emission peaks whose centers are 549 nm,524 nm and 660 nm,moreover,their intensities decreases in turn.On the basis of the variable temperature spectrum and the energy transition relationship,two sets of fluorescence intensity ratios(thermally coupled level I524 nm/I549 nm and uncoupled level I660 nm/I549 nm)were obtained,furthermore,their maximum absolute sensitivity and maximum relative sensitivity were calculated(the former are 0.0074 K-1 and 0.0004 K-1,respectively;the latter are 4.553 K-1 and 0.321 K-1,respectively).At around 300 K,the relative sensitivity of the thermally coupled energy level is 1.245%K-1,which is in the middle range of several reported similar literatures,indicating that La6W2O15:Er3+phosphor have good application potential in temperature sensing.
La6W2O15:Er3+phosphorluminescent propertiesthermal propertiesfluorescence intensity ratio
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