Judd-Ofelt theoretical approach and Rietveld refinement technique are implemented to gain a profound insight of remarkable structural and optoelectronic aspects of Eu³⁺-doped Ca₉Bi(VO₄)₇ nanophosphor. The bright red emitting vanadate-based series was developed via an efficient route of solution combustion synthesis (SCS). The Rietveld refinement, been employed upon powder X-ray diffraction (PXRD) patterns of Ca₉Bi(VO₄)₇ and Ca₉Bi_0.30Eu_0.70(VO₄)₇ confirmed the purity of phase and structural prototype as trigonal with R3c(161) space group symmetry. The synthesized sample underwent transmission electron microscopy (TEM) and field-emission scanning electron microscopy (FE-SEM) for morphological analysis while elemental composition was determined through energy dispersive X-ray (EDX) analysis. The experimental value of band gap for host Ca₉Bi(VO₄)₇ was found to be 3.28 eV. The intense emission of bright red region was abided by CIE chromaticity coordinates (x = 0.6403, y = 0.3592). The refractive index value of host is 2.76 and a meticulous study of photoluminescence PL emission spectra was performed to obtain Judd-Ofelt intensity parameters, specifically Ω₂ (= 3.429 × 10⁻²⁰) and Ω₄ (= 0.351 × 10⁻²⁰), quantum efficiencies and radiative rates for ⁵D₀ term. The structural and optoelectronic outcomes present Ca₉Bi_0.30Eu_0.70(VO₄)₇ phosphor as a strong contender for near UV-WLEDs and potential one for laser devices.

实施Judd-Ofelt理论方法和Rietveld精炼技术，以获得对Eu ³⁺掺杂的Ca ₉ Bi（VO ₄）₇纳米磷光体的显着结构和光电方面的深刻了解。基于亮红色发射钒酸盐的系列是通过固溶燃烧合成（SCS）的有效途径开发的。Rietveld精炼用于Ca ₉ Bi（VO ₄）₇和Ca ₉ Bi _0.30 Eu _0.70（VO ₄）_7的粉末X射线衍射（PXRD）图谱，证实了相的纯度和结构原型为三角形R3c（161）空间群对称。合成样品经过透射电子显微镜（TEM）和场发射扫描电子显微镜（FE-SEM）进行形态分析，同时通过能量色散X射线（EDX）分析确定元素组成。发现宿主Ca ₉ Bi（VO ₄）₇的带隙实验值为3.28 eV。CIE色度坐标（x  = 0.6403，y  = 0.3592）遵守了明亮红色区域的强烈发射要求。主机的折射率值是2.76，并且进行光致发光发射光谱的细致研究，以获得贾德-Ofelt理论强度的参数，具体地Ω ₂（= 3.429×10^-20）和Ω ₄（= 0.351×10 ^-20），量子效率和辐射率⁵ d ₀术语。结构和光电结果表明，Ca ₉ Bi _0.30 Eu _0.70（VO ₄）₇荧光粉是近UV-WLED的有力竞争者，也是激光设备的潜在竞争者。