Photoluminescence and temperature dependent properties of Bi3+, Sm3+ co-doped Ca2YSbO6 phosphor for dual-emitting optical thermometer

Bi 3+ , Sm 3+ co-doped Ca 2 YSbO 6 phosphors with dual-emitting centers were created using a high-temperature synthetic process. Investigations were conducted into the phase structure, luminous characteristics, and optical temperature dependent properties. Under the condition of 320 nm Ultraviolet light excitation, the Ca 2 YSbO 6 : Bi 3+ phosphor exhibits the 3 P 1 → 1 S 0 emission of Bi 3+ , which peaked at 402 nm, and the Ca 2 YSbO 6 : Sm 3+ phosphor exhibits the 4 G 5/2 → 6 H n/2 (n = 5, 7, 9 and 11) red emission of Sm 3+ , which is visible between 550 and 720 nm. Spectrum overlap between the PL spectrum of Bi 3+ and the PLE spectrum of Sm 3+ served as evidence for the energy transfer (ET) behavior. Furthermore, the conclusion could be supported by the life decay of Bi 3+ .In the case of optimal UV excitation of 320 nm, the maximum absolute sensitivity (S a ) and relative sensitivity (S r ) values for Ca 2 YSbO 6 : Bi 3+ , Sm 3+ were 2.21 × 10 −3  K −1 and 0.973% K −1 , respectively, at 503 K. The outcomes demonstrated that the Ca 2 YSbO 6 : Bi 3+ , Sm 3+ phosphor could perform well as an optical thermometer.