Na2GdMg2V3O12:Sm3+ phosphors for three-mode optical temperature sensing

Multi-mode optical thermometry is emerging as a promising technique for accurate temperature measurement. Here, a series of Na2GdMg2V3O12:Sm3+ (NGMVO:xSm(3+)) phosphors with dual-emission centers were successfully elaborated. Irradiated by 349 nm light, NGMVO:Sm3+ can generate emissions from VO43- and Sm3+ simultaneously due to energy transfer between them. Benefitting from difference of thermal quenching performance of two luminescent centers, fluorescence intensity (FI), fluorescence intensity ratio (FIR), and Commission Internationale de L'Eclairage coordinate modes of NGMVO:Sm3+ thermometer were designed. Maximum relative sensitivities (S-R) are found to be as high as 2.21 %K-1, 2.12 %K-1, and 0.244 %K-1, respectively. Besides, with temperature increasing, S-R values of FI and FIR modes decrease slowly. Their minimal S-R values between 303 and 513 K maintain above 1.36 %K-1 and 1.08 %K-1, respectively. Our findings reveal that NGMVO:Sm3+ phosphors have promising applications for multimode temperature senor.

Automated summary

Multi-mode optical thermometry demonstrates great potential in accurate temperature measurement. Through the elaboration of Na2GdMg2V3O12:Sm3+ phosphors, the material with dual-emission centers is successfully achieved. By irradiation of 349 nm light, NGMVO:Sm3+ can generate emissions from VO43- and Sm3+ due to energy transfer between them. The designed fluorescence intensity (FI), fluorescence intensity ratio (FIR), and Commission Internationale de L'Eclairage coordinate modes of NGMVO:Sm3+ thermometer exhibit high relative sensitivities (S-R) up to 2.21 %K-1, 2.12 %K-1, and 0.244 %K-1, respectively. Furthermore, the S-R values of FI and FIR modes decrease slowly with increasing temperature, maintaining above 1.36 %K-1 and 1.08 %K-1, respectively, between 303 and 513 K. These findings highlight the promising applications of NGMVO:Sm3+ phosphors in multimode temperature sensors.