Abstract Crystalline monoclinic phase of europium (Eu3+) doped barium zinc orthophosphate [BaZn2(PO4)2: BZP] phosphor has been synthesized via solid-state reaction technique. The phase purity, morphology and luminescent features of the as-synthesized phosphors have been examined using the results of X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL), respectively. The XRD results indicate pure phase formation of Eu3+ doped BZP (BZP:Eu3+) phosphor due to exact matching with the standard data of BZP. The SEM image specifies irregular shape of micro sized particles and non-uniform morphology. The BZP:Eu3+ phosphor exhibits intense emission at 592 nm wavelength under ultraviolet (UV), near-UV and blue light excitations. The emission spectra disclose that the emission intensity improved with increase in Eu3+ ions concentration up to 4.0 mol% and intensity decreases beyond it. The CIE coordinates (0.625, 0.363) calculated for the optimized BZP:Eu3+ phosphor, which fall in the pure red region and close to commercially available red phosphor Y2O2S: Eu3+ (0.647, 0.343). The PL intensity sustained up to 62.25% at 150 °C as compared to the intensity at room temperature indicating good thermal stability of BZP phosphor. All the above mentioned results signify the potential candidature of BZP:Eu3+ phosphors for white light emitting devices.

中文翻译：

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用于白光 LED 的热稳定 Eu3+ 活化钡锌正磷酸磷光体的结构和光谱特性

摘要 通过固相反应技术合成了铕(Eu3+)掺杂的正磷酸钡锌[BaZn2(PO4)2:BZP]荧光粉的单斜晶相。分别使用 X 射线衍射 (XRD)、扫描电子显微镜 (SEM) 和光致发光 (PL) 的结果检查了合成的磷光体的相纯度、形态和发光特征。由于与 BZP 的标准数据精确匹配，XRD 结果表明 Eu3+ 掺杂的 BZP (BZP:Eu3+) 磷光体形成纯相。SEM 图像指定了微尺寸颗粒的不规则形状和不均匀的形态。BZP:Eu3+ 荧光粉在紫外 (UV)、近紫外和蓝光激发下在 592 nm 波长处表现出强烈的发射。发射光谱表明，发射强度随着 Eu3+ 离子浓度增加至 4.0 mol% 而提高，超过该浓度则强度降低。为优化的 BZP:Eu3+ 荧光粉计算的 CIE 坐标 (0.625, 0.363)，落在纯红色区域，接近市售红色荧光粉 Y2O2S: Eu3+ (0.647, 0.343)。与室温下的强度相比，PL 强度在 150°C 下持续高达 62.25%，表明 BZP 荧光粉具有良好的热稳定性。所有上述结果表明 BZP:Eu3+ 荧光粉可用于白光发光器件。Eu3+ (0.647, 0.343)。与室温下的强度相比，PL 强度在 150°C 下持续高达 62.25%，表明 BZP 荧光粉具有良好的热稳定性。所有上述结果表明 BZP:Eu3+ 荧光粉可用于白光发光器件。Eu3+ (0.647, 0.343)。与室温下的强度相比，PL 强度在 150°C 下持续高达 62.25%，表明 BZP 荧光粉具有良好的热稳定性。所有上述结果表明 BZP:Eu3+ 荧光粉可用于白光发光器件。