The development of phosphors with high reliability along with suitable sensitivity (Sr > 1% K–1) and thermal resolution (ΔT < 0.5 K) in the physiological temperature range is still a critical challenge for their potential ability in various applications. Adding to the ongoing research, we have studied the nonthermal coupling energy levels of Tm3+, Ho3+, and Yb3+ ions in the tridoped NaLa(MoO4)2 (NLMO) phosphors. The comparative temperature-dependent upconversion (UC) study of the Tm3+/Yb3+, Ho3+/Yb3+, and Tm3+/Ho3+/Yb3+-doped NLMO phosphors was performed, and maximum relative sensitivity of about 1.63% K–1 (at 308 K) and temperature uncertainty in the range of 0.08–0.26 K are achieved for Tm3+/Ho3+/Yb3+ tridoped NLMO phosphor. The repeatability measurements for four cycles validate the excellent thermal stability of the phosphor. The Tm3+/Ho3+ codoped phosphors exhibit excellent energy transfer of about 99% from Tm3+ to Ho3+ ions, which results in the color tunability from blue to green region. The excellent energy transfer is well supported by decay analysis. Moreover, the excitation of 358 nm matches well with the commercially available near UV chips. The results of our study on Tm3+/Ho3+/Yb3+-doped NLMO phosphors reveal their potential application as a upconverting temperature sensor and downconverting color tunable phosphors.
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Tomar et al. (2024) studied this question.
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