Here, we report the synthesis and study of new orange‐red (OR) colour‐emitting phosphors Na₂ZnP₂O₇:xTb³⁺ (x = 1, 1.25, 1.5, and 1.75 mol%) using a conventional solid‐state reaction. The sample crystallographic structures and their room temperature photoluminescence properties were measured using X‐ray powder diffraction, excitation and emission spectra, as well as emission decay curves. X‐ray diffraction analysis showed an isostructural tetragonal structure for all the doped materials with no impurities. Several colour emissions corresponding to ⁵D₄→⁷F₆ (blue), ⁵D₄→⁷F₅ (green), ⁵D₄→⁷F₄ (orange) and ⁵D₄→⁷F_3,2,0 (red) intraconfigurational transitions were observed and investigated. These colours were dominated by the OR colours. ⁵D₄ energy level lifetime was independent of Tb³⁺ concentration. Various radiative and luminescence parameters, such as experimental branching ratio, radiative decay rate, and luminescence quantum efficiencies, were calculated and discussed. Chromaticity diagram calculations illustrated an orange emission for all the studied materials.

中文翻译：

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基于Tb3 +离子掺杂的Na2ZnP2O7的新型橙红色发射磷光体的合成和发光光谱研究

在这里，我们报告了使用传统固态合成和研究新的橙红色（OR）彩色荧光粉Na ₂ ZnP ₂ O ₇：xTb ³⁺（x = 1，1.25，1.5 ，和1.75 mol％）反应。使用X射线粉末衍射，激发和发射光谱以及发射衰减曲线测量了样品的晶体结构及其室温光致发光特性。X射线衍射分析表明，所有掺杂材料均具有同构四边形结构，且无杂质。对应于⁵ D ₄ → ⁷ F ₆（蓝色），⁵ D ₄ → ^7的几种颜色发射观察并研究了F ₅（绿色），⁵ D ₄ → ⁷ F ₄（橙色）和⁵ D ₄ → ⁷ F _3,2,0（红色）构型转变。这些颜色以OR颜色为主。⁵ D ₄能级寿命与Tb ³⁺浓度无关。计算和讨论了各种辐射和发光参数，例如实验分支比，辐射衰减率和发光量子效率。色度图计算说明了所有研究材料的橙色发射。