We have successfully synthesized co-doped Bi³⁺/Eu³⁺: CLZO nanophosphor spheres by citrate sol-gel method. Tetragonal structure has been confirmed from the XRD analysis. Morphological studies were carried out from FE-SEM analysis for the optimized sample. EDAX and XPS measurements were employed to confirm the presence of elements and their ionic states. The homogeneous shape, size and crystalline planes of the phosphor crystalline nanosphere have been clearly demonstrated by HR-TEM analysis. Photoluminescence (PL) spectral profiles reveal that the strong red emission has been noticed at 626 nm (⁵D₀→⁷F₂) from the Eu³⁺: CLZO phosphors under the visible excitation of 467 nm. The PL performance has been remarkably enhanced by increasing the Eu³⁺ ion concentration. By co-doping with Bi³⁺ ions to Eu³⁺: CLZO phosphors, the red emission pertaining to Eu³⁺ was appreciably enhanced through energy transfer from Bi³⁺ to Eu³⁺ ions. The energy transfer mechanism from Bi³⁺ to Eu³⁺ ions has been demonstrated by partial energy level scheme diagram. Commission International de I'Echairage (CIE) 1931 chromaticity coordinates (x-y) calculated for singly Eu³⁺(12 mol %): CLZO and co-doped Eu³⁺(12 mol %)+Bi³⁺(1 mol %): CLZO nanophosphor spheres and they were found to be (0.6644, 0.3355) and (0.6688, 0.3311) respectively. The Correlated Color Temperature (CCT) value was evaluated as 3059 K for co-doped sample. Moreover, lifetime and quantum efficiency for Eu³⁺ emission were significantly enhanced upon co-doping with Bi³⁺ ions to the Eu³⁺ doped CLZO nanophosphor spheres. The energy transfer phenomenon from Bi³⁺ to Eu³⁺ ions was clearly elucidated by several fluorescence dynamics such as overlapped spectral studies, photoluminescence spectral features, CIE color coordinates and quantum efficiency. These dazzling red luminescent nanophosphor spheres material could be suggested as a promising candidate for solid state illumination and optical display devices.

我们已经成功地通过柠檬酸溶胶-凝胶法合成了共掺杂的Bi ³⁺ / Eu ³⁺：CLZO纳米磷光球。四边形结构已通过XRD分析得到证实。从FE-SEM分析中进行了形态学研究，以优化样品。EDAX和XPS测量用于确认元素的存在及其离子状态。HR-TEM分析清楚地证明了磷光体晶体纳米球的均匀形状，大小和晶面。光致发光（PL）光谱图表明，在626 nm（⁵ D ₀ → ⁷ F ₂）处，从Eu ³⁺发出了强烈的红色发射：CLZO磷光体在467 nm的可见光激发下。通过增加Eu ³⁺离子浓度，可以显着提高PL性能。通过与Bi ³⁺离子共掺杂到Eu ³⁺：CLZO荧光粉，通过从Bi ³⁺到Eu ³⁺离子的能量转移，明显增强了Eu ³⁺的红色发射。从Bi ³⁺到Eu ³⁺离子的能量转移机理已通过部分能级方案图得到了证明。国际委员会主席（CIE）1931年针对单个Eu ³⁺（12 mol％）的色度坐标（xy ）：CLZO和共掺杂的Eu ³⁺（12 mol％）+ Bi³⁺（1mol％）：CLZO纳米磷光体球，发现它们分别是（0.6644，0.3355）和（0.6688，0.3311）。对于共掺杂样品，相关色温（CCT）值评估为3059K。此外，与Bi ³⁺离子共掺杂到Eu ³⁺掺杂的CLZO纳米磷光球上后，Eu ³⁺发射的寿命和量子效率显着提高。从Bi ³⁺到Eu ³⁺的能量转移现象几种荧光动力学，例如重叠光谱研究，光致发光光谱特征，CIE色坐标和量子效率，清楚地阐明了这些离子。这些令人眼花red乱的红色发光纳米磷光体材料可能被建议作为固态照明和光学显示设备的有前途的候选者。