Speaker
Description
Rare‑earth‑doped phosphor nanomaterials have attracted significant research interest due to their efficient upconversion luminescence, whereby infrared radiation is converted into visible emission. Such materials are promising for a wide range of applications, including solid‑state lighting, optical converters, biosensors, and data storage technologies. In this study, the structural and photoluminescence properties of spinel Zn₂TiO₄ phosphor co‑activated with Er³⁺ and Yb³⁺ ions were investigated to evaluate its suitability for upconversion applications. X‑ray diffraction (XRD) analysis confirmed the successful formation of the spinel Zn₂TiO₄:Er³⁺,Yb³⁺ phase. Computational calculations were used to correlate the structural characteristics of Zn₂TiO₄ with the observed upconversion luminescence behaviour. Under near-infrared excitation, the photoluminescence spectrum exhibited distinct green and red emission bands, which are attributed to the intra-4f transitions of Er³⁺ ions. The corresponding Commission Internationale de l’Éclairage (CIE) chromaticity coordinates indicate a greenish‑yellow emission, confirming the effective upconversion behaviour of the Zn₂TiO₄:Er³⁺,Yb³⁺ phosphor.
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