Ho³⁺/Yb³⁺-codoped ZnWO₄phosphors were synthesized using a solid state reaction method. The optical temperature sensing properties of ZnWO₄:0.01Ho³⁺/0.15Yb³⁺phosphors have been discussed by using four-level system and the intensity ratio between the red and green emissions.

Er³⁺/Yb³⁺ co-doped ZnWO₄ phosphors were synthesized by a solid state reaction method and their structure, photoluminescence and temperature sensing properties were characterized. The color-tunable upconversion emissions (from green to red) were observed by increasing the doped Er³⁺/Yb³⁺ concentration. The temperature sensing properties were studied by using the fluorescence intensity ratio technique in the temperature range of 83-583 K, and high performance was obtained. The maximum sensitivity is found to be 0.0099 K⁻¹ at 583 K. The XRD Rietveld refinement revealed that the phosphors crystallized in monoclinic structure with the space group P2/c (13) at room temperature. The results suggest that the phosphors could be an exceptional choice for next generation luminescence-based temperature sensing devices as well as in multiple biolabels.

The Er ³⁺ /Yb ³⁺ co-doped MgWO ₄ phosphor exhibited green UC and DC emission at excited by of 980 nm (a) and 379 nm (b) light, respectively.

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<mml:math display="inline"><mml:mrow><mml:mrow><mml:mo>(</mml:mo><mml:mi mathvariant="normal">Ba</mml:mi><mml:mo>,</mml:mo><mml:mi mathvariant="normal">Ca</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mi mathvariant="normal">Ti</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:mo>:</mml:mo><mml:msup><mml:mi mathvariant="normal">Pr</mml:mi><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>(Ba,Ca)TiO3:Pr3+ diphase ceramics with the self-assembled piezoelectric/phosphor/piezoelectric sandwich architectures have been synthesized using the solid-state reaction method. Their structure, elastico-mechanoluminescence (EML) property, and trap energy levels are characterized. In the diphase region, strong EML has been obtained and optimized. The relation between EML and electroluminescence (EL) has been investigated. The EML phenomenon under the strong pressure is explained by the piezoelectrically induced EL model. Whereas, the mechanoluminescene mechanism under the weak pressure is discussed using the piezoelectrically induced charge detrapping model.