Strategic Investigation of Dual-Mode Light Emission from Tm3+/Ho3+/Yb3+-Activated NaLa(MoO4)2 Phosphors for Color Tunability and Optical Temperature Sensing Applications

Tomar, S and Mishra, NK and Chauhan, V and Kumar, K and Shivakumara, C (2024) Strategic Investigation of Dual-Mode Light Emission from Tm3+/Ho3+/Yb3+-Activated NaLa(MoO4)2 Phosphors for Color Tunability and Optical Temperature Sensing Applications. In: Journal of Physical Chemistry C .

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Abstract

The development of phosphors with high reliability along with suitable sensitivity (Sr > 1 K-1) and thermal resolution (�T < 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. © 2024 American Chemical Society.

Item Type:	Journal Article
Publication:	Journal of Physical Chemistry C
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society.
Keywords:	Color; Energy transfer; Holmium compounds; Lanthanum compounds; Light emission; Molybdenum compounds; Sodium compounds; Temperature sensors; Thermodynamic stability; Thulium compounds; Ytterbium compounds, Color tunability; Critical challenges; Dual modes; Energy-transfer; High reliability; Optical temperature sensing; Physiological temperature; Sensing applications; Temperature range; Thermal resolution, Phosphors
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	01 Aug 2024 06:58
Last Modified:	01 Aug 2024 06:58
URI:	http://eprints.iisc.ac.in/id/eprint/85776

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