Self-activated tungstates doped with lanthanide ions are an excellent class of phosphor materials, exhibiting promising luminescence efficiency as well as stability which opens up their vast arena of applications. In this work, a detailed comparative study has been carried out on Sm³⁺ doped Ba/CaWO₄ phosphors, synthesized via solid state reaction route. The structural, morphological and photo-physical properties have been investigated through various analytical techniques. The optical band gap and the refractive index of the phosphors have been estimated through diffuse reflectance spectroscopy. A 5-fold enhancement of the emission intensity is observed in CaWO₄ as compared to BaWO₄ phosphors owing to high asymmetrical environment. The underlying mechanisms of photoluminescence and energy transfer process (WO₄²⁺→Sm³⁺) are discussed in detail. The colour tuning from orange red to pure red emission is obtained from the Commission International de l'Eclairage (CIE) diagram. Better luminescent properties with desirable quantum yield, absorption efficiency and suitable Correlated Colour Temperature (CCT) and colour purity (91%) values allow the optimised phosphors for diverse potential applications such as solid-state lighting, security ink for anti-counterfeiting, latent fingerprint detection, etc.

中文翻译：

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Sm3+ 掺杂 BaWO4 和 CaWO4 荧光粉的性能及其在潜在指纹和防伪中的应用


掺杂镧系元素离子的自活化钨酸盐是一类优秀的荧光粉材料，表现出良好的发光效率和稳定性，这开辟了其广阔的应用领域。在这项工作中，对通过固态反应路线合成的 Sm³⁺ 掺杂 Ba/CaWO₄ 荧光粉进行了详细的比较研究。结构、形态和光物理特性已通过各种分析技术进行了研究。荧光粉的光学带隙和折射率是通过漫反射光谱估计的。由于高度不对称的环境，与 BaWO₄ 荧光粉相比，CaWO₄ 的发射强度提高了 5 倍。详细讨论了光致发光和能量转移过程 （WO₄²⁺→Sm³⁺） 的基本机制。从橙红色到纯红色发射的颜色调整来自国际闪电控制委员会 （CIE） 图。更好的发光特性、理想的量子产率、吸收效率以及合适的相关色温 （CCT） 和颜色纯度 （91%） 值使优化的荧光粉可用于各种潜在应用，例如固态照明、防伪安全油墨、潜在指纹检测等。