Abstract Sm3+ doped CaBiVO5 (CBV: Sm3+) phosphors synthesized namely by solid-state reaction (SSR), combustion (CB) and citrate sol-gel (SG) method to optimize the synthesis procedure and also to enhance the luminescent properties for the first time. X-ray powder diffraction patterns and scanning electron micrographs recorded for the synthesized CBV: Sm3+ phosphors to analyse structural and morphological aspects, respectively. The excitation spectra measured by monitoring emission at 649 nm for CBV: Sm3+ phosphors reveal significant absorption in ultraviolet (UV), near (n)-UV and blue spectral regions. The comparative photoluminescence (PL) spectra measured under 343 nm excitation for differently synthesized CBV: Sm3+ phosphors, which exhibit significantly enhanced emission intensity for SG derived phosphor than other adopted methods. The PL spectra for SG derived 1.0 mol% Sm3+ doped CBV phosphor at λex = 275 and 343 nm exhibit sharp peaks located at 566, 606 and 649 nm along with weak host emission broadband and for λex = 406 nm, similar sharp peaks of Sm3+ transitions are observed without any host emission. Unlike mostly explored Sm3+ doped phosphors, emission peak in red spectral region (649 nm) is more intense as compared to the emission peak in orange region (599 nm) in the present work. The energy transfer mechanism responsible for concentration quenching in CBV phosphors is discussed in detail. The CBV: Sm3+ phosphors manifest color tunability from orange to orange-red region by modulating excitation from 275 nm (0.567, 0.404) to 343 nm (0.591, 0.399) and finally to 406 nm (0.620, 0.376). The temperature-dependent PL studies indicate appreciable thermal stability of as-prepared phosphor. Above mentioned results suggest that CBV: Sm3+ phosphor has great potential for use in white light-emitting diode (w-LED) applications.

中文翻译：

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用于 w-LED 应用的强红光发射热稳定 Sm3+ 掺杂 CaBiVO5 磷光体优化结构和发光性能

摘要 通过固态反应（SSR）、燃烧（CB）和柠檬酸盐溶胶-凝胶（SG）法合成了 Sm3+掺杂的 CaBiVO5（CBV：Sm3+）荧光粉，以优化合成程序并首次提高发光性能。 . 为合成的 CBV：Sm3+ 荧光粉记录的 X 射线粉末衍射图和扫描电子显微照片，分别用于分析结构和形态方面。通过监测 649 nm CBV 的发射测量的激发光谱：Sm3+ 磷光体显示在紫外 (UV)、近 (n)-UV 和蓝色光谱区域有显着吸收。在 343 nm 激发下测量的不同合成 CBV：Sm3+ 荧光粉的比较光致发光 (PL) 光谱，与其他采用的方法相比，SG 衍生荧光粉的发射强度显着增强。SG 衍生的 1.0 mol% Sm3+ 掺杂 CBV 荧光粉在 λex = 275 和 343 nm 处的 PL 光谱显示位于 566、606 和 649 nm 处的尖峰以及弱主体发射宽带，对于 λex = 406 nm，类似的 Sm3+ 跃迁尖峰在没有任何宿主发射的情况下观察到。与大多数探索的 Sm3+ 掺杂磷光体不同，与目前工作中橙色区域（599 nm）的发射峰相比，红色光谱区域（649 nm）的发射峰更强烈。详细讨论了导致 CBV 荧光粉浓度猝​​灭的能量转移机制。CBV: Sm3+ 荧光粉通过将激发波长从 275 nm (0.567, 0.404) 调制到 343 nm (0.591, 0.399) 并最终调制到 406 nm (0.620, 0.376)，从而表现出从橙色到橙红色区域的颜色可调性。温度相关的 PL 研究表明所制备的磷光体具有可观的热稳定性。上述结果表明 CBV：Sm3+ 荧光粉在白光发光二极管 (w-LED) 应用中具有巨大的潜力。