Na <sub>2</sub> GdMg <sub>2</sub> V <sub>3</sub> O <sub>12</sub> :Sm <sup>3+</sup> phosphors for three‐mode optical temperature sensing
Junyu Chen, LianJie Li, Tao Pang, Hai Guo, Liping Chen
Abstract
Abstract Multi‐mode optical thermometry is emerging as a promising technique for accurate temperature measurement. Here, a series of Na 2 GdMg 2 V 3 O 12 :Sm 3+ (NGMVO: x Sm 3+ ) phosphors with dual‐emission centers were successfully elaborated. Irradiated by 349 nm light, NGMVO:Sm 3+ can generate emissions from VO 4 3− and Sm 3+ 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:Sm 3+ 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:Sm 3+ phosphors have promising applications for multimode temperature senor.