Ce-doped (1 × 10-5 to 3.0 mol%) SrBPO5 phosphors were synthesized using a conventional solid-state reaction route at 1273 K in an air atmosphere. Phase and morphology of the samples were studied from powder X-ray diffraction (XRD) patterns and scanning electron microscope (SEM) micrographs, respectively. The band gap energies of the pure and Ce-doped SrBPO5 phosphors were calculated from the recorded diffuse reflectance spectra. Photoluminescence (PL) and Ce3+ lifetime were recorded at 300 and 77 K. Photoluminescence lifetime measurements revealed two-lifetime values for Ce3+ at both 300 K (17 and 36 nsec) and 77 K (12 and 30 nsec), suggesting the presence of two different environments around Ce3+ . Time-resolved emission spectroscopy (TRES) studies confirmed the presence of Ce3+ in two different environments. In addition, SrBPO5 :Ce exhibited intense UV emission, signifying its possible use as an efficient sensitizer for solid-state lighting applications. The effect of γ-irradiation on PL was also determined. Thermally stimulated luminescence (TSL) glow curves of the γ-irradiated phosphor, along with trap parameters, dose-response, and the possible TSL mechanism were also investigated. Positron annihilation lifetime spectroscopy was carried out to probe defects present in undoped and Ce-doped SrBPO5 .

中文翻译：

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探索发射紫外线的SrBPO5：Ce3 +荧光粉的光学性质和发光机理。

使用空气中的常规固态反应路线在1273 K下合成Ce掺杂（1×10-5至3.0 mol％）的SrBPO5磷光体。分别从粉末X射线衍射（XRD）图和扫描电子显微镜（SEM）显微照片研究了样品的相和形态。从记录的漫反射光谱计算出纯的和Ce掺杂的SrBPO5磷光体的带隙能。记录了300和77 K的光致发光（PL）和Ce3 +的寿命。光致发光寿命测量显示，在300 K（17和36纳秒）和77 K（12和30纳秒）下Ce3 +的两个寿命值，表明存在两个Ce3 +周围的不同环境。时间分辨发射光谱法（TRES）研究证实了Ce3 +在两种不同环境中的存在。另外，SrBPO5：Ce表现出强烈的紫外线发射，表明它有可能用作固态照明应用的有效敏化剂。还确定了γ辐照对PL的影响。还研究了γ辐照磷光体的热激发发光（TSL）辉光曲线，以及陷阱参数，剂量响应和可能的TSL机理。进行正电子an没寿命光谱法以探测未掺杂和铈掺杂的SrBPO5中存在的缺陷。