Abstract Ca19(1-x)M2(PO4)14:19xEu3+ (M = Mg, Zn) (x = 0.05, 0.07, 0.09, 0.10, 0.11 and 0.12) red phosphors were successfully synthesized by the high-temperature solid-phase reaction method. The phase composition, morphology and characteristic photoluminescence properties of Ca19Mg2(PO4)14 (CMPO):Eu3+ and Ca19Zn2(PO4)14 (CZPO):Eu3+ were analyzed by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM) and photoluminescence spectroscopy. The photoluminescence excitation (PLE) and emission (PL) spectra of both samples indicate that the phosphors can be effectively excited by ultraviolet (UV) and blue light, and also it is shown that the electric-dipole transition of Eu3+ is dominant. The typical concentration quenching occurs when Eu3+-doping concentrations of both phosphors exceed 10 mol%, and the PL intensity of CZPO:0.10Eu3+ sample is 1.65 times that of CMPO:0.10Eu3+. Furthermore, the infrared spectra (IR), differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA) curves, ultraviolet–visible diffuse reflectance spectra (UV–Vis DRS), thermal stability, chromaticity coordinates (CIE) and correlated color temperature (CCT) of Ca19M2(PO4)14:Eu3+ phosphors were evaluated in detail. The band gaps of CMPO and CZPO hosts were equal to 6.46 and 6.39 eV, respectively. The I423K/I298K values of CMPO:Eu3+ and CZPO:Eu3+ phosphors are as high as 73.89% and 88.29%. The chromaticity coordinates of Ca19(1-x)M2(PO4)14:19xEu3+ (M = Mg, Zn) phosphors locate in red region, and the color purity values of CMPO:Eu3+ and CZPO:Eu3+ are determined to be 99.82% and 99.61%, respectively. To sum up, the phosphors are considered as the potential luminescence materials for use in white light emitting diodes (w-LEDs).

中文翻译：

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Ca19M2(PO4)14:Eu3+ (M = Mg, Zn) 荧光粉的系统研究：M 阳离子对光致发光的影响

摘要 Ca19(1-x)M2(PO4)14:19xEu3+ (M = Mg, Zn) (x = 0.05, 0.07, 0.09, 0.10, 0.11 and 0.12) 红色荧光粉通过高温固相反应成功合成方法。采用X射线粉末衍射（XRD）、场发射扫描电子显微镜（FESEM）分析Ca19Mg2(PO4)14(CMPO):Eu3+和Ca19Zn2(PO4)14(CZPO):Eu3+的相组成、形貌和特征光致发光性能。 ) 和光致发光光谱。两个样品的光致发光激发（PLE）和发射（PL）光谱表明荧光粉可以被紫外（UV）和蓝光有效激发，并且表明Eu3+的电偶极跃迁占主导地位。当两种磷光体的 Eu3+ 掺杂浓度超过 10 mol% 且 CZPO 的 PL 强度为 0 时，就会发生典型的浓度猝灭。10Eu3+ 样品是 CMPO:0.10Eu3+ 的 1.65 倍。此外，红外光谱 (IR)、差示扫描量热法 (DSC) 和热重分析 (TGA) 曲线、紫外-可见漫反射光谱 (UV-Vis DRS)、热稳定性、色度坐标 (CIE) 和相关色温 (详细评估了 Ca19M2(PO4)14:Eu3+ 磷光体的 CCT)。CMPO 和 CZPO 主体的带隙分别等于 6.46 和 6.39 eV。CMPO:Eu3+和CZPO:Eu3+荧光粉的I423K/I298K值分别高达73.89%和88.29%。Ca19(1-x)M2(PO4)14:19xEu3+ (M = Mg, Zn) 荧光粉的色度坐标位于红色区域，确定 CMPO:Eu3+ 和 CZPO:Eu3+ 的色纯度值为 99.82% 和分别为 99.61%。总结，