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

Bi3+, Sm3+ co-doped Ca2YSbO6 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 Ca2YSbO6: Bi3+ phosphor exhibits the 3P1→1S0 emission of Bi3+, which peaked at 402 nm, and the Ca2YSbO6: Sm3+ phosphor exhibits the 4G5/2→6Hn/2 (n = 5, 7, 9 and 11) red emission of Sm3+, which is visible between 550 and 720 nm. Spectrum overlap between the PL spectrum of Bi3+ and the PLE spectrum of Sm3+ served as evidence for the energy transfer (ET) behavior. Furthermore, the conclusion could be supported by the life decay of Bi3+.In the case of optimal UV excitation of 320 nm, the maximum absolute sensitivity (Sa) and relative sensitivity (Sr) values for Ca2YSbO6: Bi3+, Sm3+ were 2.21 × 10−3 K−1 and 0.973% K−1, respectively, at 503 K. The outcomes demonstrated that the Ca2YSbO6: Bi3+, Sm3+ phosphor could perform well as an optical thermometer.