Natural scapolite including the S-2impurity is a typical silicate luminescent mineral.According to the formation conditions and chemical composition of natural scapolite,we synthesized Na_(4)Ca_(4)Al_(6)Si_(9)O_(24)(s...Natural scapolite including the S-2impurity is a typical silicate luminescent mineral.According to the formation conditions and chemical composition of natural scapolite,we synthesized Na_(4)Ca_(4)Al_(6)Si_(9)O_(24)(scapolite)by the high temperature solid-phase reaction,and prepared the synthetic scapolite phosphors activated with Ce^3+and Tb^3+.The photoluminescence(PL)properties of the obtained phosphors were studied.The results indicated that the PL intensity of green(545nm)emission corresponding to the 5 D4→7 F5 transition within Tb^3+in the Ce^3+,Tb^3+-codoped samples was much higher than that of the Tb^3+-doped samples.The PL properties of the samples activated with various Ce^3+concentrations were measured,and their fluorescence lifetime and energy transfer mechanism were analyzed.We proved that there was energy transfer from Ce^3+to Tb^3+,and the energy transfer efficiency was at its maximum when the Ce^3+to Tb^3+mass ratio was 0.02∶0.03.Upon measurement by chromaticity coordinates,we found that the luminescence of the samples could be adjusted in the green area with varying Ce^3+concentrations.We thus deem that scapolite phosphors Na4Ca4Al6Si9O24∶Ce^3+,Tb^3+are promising to become the new white LED phosphors.展开更多
基金the National Natural Science Foundation(11264040,No.11464045)The doctoral scientific research foundation of Xinjiang Normal University(XJNUBS1409)
文摘Natural scapolite including the S-2impurity is a typical silicate luminescent mineral.According to the formation conditions and chemical composition of natural scapolite,we synthesized Na_(4)Ca_(4)Al_(6)Si_(9)O_(24)(scapolite)by the high temperature solid-phase reaction,and prepared the synthetic scapolite phosphors activated with Ce^3+and Tb^3+.The photoluminescence(PL)properties of the obtained phosphors were studied.The results indicated that the PL intensity of green(545nm)emission corresponding to the 5 D4→7 F5 transition within Tb^3+in the Ce^3+,Tb^3+-codoped samples was much higher than that of the Tb^3+-doped samples.The PL properties of the samples activated with various Ce^3+concentrations were measured,and their fluorescence lifetime and energy transfer mechanism were analyzed.We proved that there was energy transfer from Ce^3+to Tb^3+,and the energy transfer efficiency was at its maximum when the Ce^3+to Tb^3+mass ratio was 0.02∶0.03.Upon measurement by chromaticity coordinates,we found that the luminescence of the samples could be adjusted in the green area with varying Ce^3+concentrations.We thus deem that scapolite phosphors Na4Ca4Al6Si9O24∶Ce^3+,Tb^3+are promising to become the new white LED phosphors.
