首页|A dual-mode optical thermometer based on dual-excitation Bi3+,Sm3+co-doped Y4GeO8 phosphors
A dual-mode optical thermometer based on dual-excitation Bi3+,Sm3+co-doped Y4GeO8 phosphors
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Dual-excitation and dual-emission Y4GeO8:Bi3+,Sm3+phosphors were manufactured by traditional solid-phase sintering technique.The X-ray diffraction,morphology,photoluminescence,energy transfer process and temperature sensing properties of Y4GeO8:Bi3+,Sm3+samples were comprehensively evaluated.The Y4GeO8∶Bi3+,Sm3+phosphors exhibit characteristic emissions of Bi3+(3P1→1S0)and Sm3+(4G5/2→6H)under both 290 and 347 nm excitations.In fluorescence intensity ratio and Commission International de L'Eclairage coordinates modes,Y4GeO8:Bi3+,Sm3+samples present excellent temperature measurement performance.The maximum relative sensitivity(Sr-max)values of the former are 1.55％/K(460 K,290 nm excitation)and 0.82％/K(506 K,347 nm excitation).The Sr-max(x)values of the latter are 0.21％/K(437 K,290 nm excitation)and 0.15％/K(513 K,347 nm excitation).These results illustrate that Y4GeO8:Bi3+,Sm3+phosphors can be used as a candidate material for a dual-mode optical thermometer under dual-excitation.
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