Department of Physics, Rashtrasant Tukadoji Maharaj Nagpur University, Nagpur, India.
Luminescence. 2021 Dec;36(8):1837-1846. doi: 10.1002/bio.3900. Epub 2021 Apr 27.
A Eu -activated Ca Mg (PO ) phosphor was prepared at high temperature (800°C) using a solid-state reaction method. The crystal structure, phase formation of the prepared phosphor was characterized using X-ray diffraction patterns and Fourier transformed infrared analysis. The luminescence properties of the synthesized phosphor were characterized using photoluminescence and thermoluminescence techniques. The prepared phosphor showed two emission peaks at 594 nm with an orange colour due to the D → F transition and at 612 nm a red colour due to the D → F transition under 396 nm near-UV excitation. The prepared phosphors were irradiated with different doses of γ-rays from a Co gamma irradiation source. Thermoluminescence glow curves for this sample phosphor were obtained using a Nucleonix 1009I TL reader. Synthesized phosphor samples were exposed to a 3.6 kGy dose of γ-rays. The thermoluminescence glow curve of the Ca Mg (PO ) :0.05 mol%Eu phosphor showed maximum intensity at all concentrations of Eu ions. The Ca Mg (PO ) :0.05 mol%Eu phosphor was irradiated with different doses of Co γ-irradiation and a linear response was observed between 0.6 kGy and 3.6 kGy. Trapping parameters such as activation energy, frequency factor and order of kinetics were calculated. The CIE chromaticity diagram showed the colour coordinates of the synthesized phosphor in the orange and red regions of the visible spectrum; this spectral feature revealed high colour purity and excellent chromaticity coordinate characteristics. Photoluminescence and thermoluminescence properties revealed that the prepared phosphor could be a potential red-emitting phosphor for eco-friendly white light generation and an excellent thermoluminescent dosimeter material for thermoluminescence dosimetric applications.
采用高温固相反应法制备了 Eu 激活的 CaMg(PO ) 荧光粉。利用 X 射线衍射图谱和傅里叶变换红外分析对所制备荧光粉的晶体结构、相形成进行了表征。采用荧光光谱和热释光技术对合成荧光粉的发光性能进行了表征。所制备的荧光粉在 396nm 近紫外光激发下，由于 D→F 跃迁，在 594nm 处出现一个橙色发射峰，由于 D→F 跃迁，在 612nm 处出现一个红色发射峰。将所制备的荧光粉用来自 Co 伽马辐照源的不同剂量的 γ 射线辐照。用 Nucleonix 1009I TL 读取器获得该样品荧光粉的热释光发光曲线。合成的荧光粉样品在 3.6kGy 的 γ 射线剂量下进行照射。在所有 Eu 离子浓度下，CaMg(PO )：0.05mol%Eu 荧光粉的热释光发光曲线都显示出最大强度。对 CaMg(PO )：0.05mol%Eu 荧光粉进行了不同剂量的 Coγ辐照，在 0.6kGy 至 3.6kGy 之间观察到线性响应。计算了捕获参数，如激活能、频率因子和动力学阶数。CIE 色度图显示了合成荧光粉在可见光谱的橙色和红色区域的色坐标；这种光谱特征表明了高的色纯度和优异的色度坐标特性。光致发光和热致发光性能表明，所制备的荧光粉可能是一种潜在的用于环保型白光产生的红色发射荧光粉，也是一种用于热释光剂量测量应用的优异热致发光剂量计材料。
