Abstract Series of Tb3+-doped phosphates Ca9–xZnxTb(PO4)7 and Ca9–xZnxLa0.99(PO4)7:0.01 Tb3+ with β-Ca3(PO4)2-type structure were synthesized using a standard high temperature route. The luminescence properties of these compounds were determined by the photoluminescence emission (PL), the excitation (PLE) spectra and lifetime measurements. A green-emitting LED device was fabricated using the most effective one. No concentration quenching was detected in the whole region of solid solutions. Upon Ca2+ → Zn2+ substitution the crystal structure transformation from the polar to centrosymmetric. The ways of control the PL spectra and cross-relaxation process were determined. In both solid solutions a “green” magneto-dipole 5D4 → 7F5 transition is predominant. The integral intensity increases in 3 times in the most effective Ca8ZnTb(PO4)7 phosphor. The measured quantum yields (QY) reached 31%. Thus, a target substitution of Ca2+ by Zn2+ is a new path for crystal site engineering and allows to obtain an efficient green luminescence of Tb3+ ions in the β-Ca3(PO4)2-type hosts.

中文翻译：

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发绿光的 β-Ca 3(PO4)2 相关荧光粉中的晶体位点工程和交叉弛豫的转向

摘要 采用标准高温路线合成了一系列具有β-Ca3(PO4)2 型结构的Tb3+ 掺杂磷酸盐Ca9-xZnxTb(PO4)7 和Ca9-xZnxLa0.99(PO4)7:0.01 Tb3+。这些化合物的发光特性由光致发光发射 (PL)、激发 (PLE) 光谱和寿命测量值决定。使用最有效的一种制造了一种发绿光的 LED 器件。在整个固溶体区域未检测到浓度猝灭。Ca2+ → Zn2+ 取代后，晶体结构从极性转变为中心对称。确定了控制PL光谱和交叉弛豫过程的方法。在这两种固溶体中，“绿色”磁偶极子 5D4 → 7F5 转变占主导地位。在最有效的 Ca8ZnTb(PO4)7 荧光粉中，积分强度增加了 3 倍。测得的量子产率 (QY) 达到 31%。因此，用 Zn2+ 替代 Ca2+ 是晶体位点工程的新途径，并允许在 β-Ca3(PO4)2 型主体中获得 Tb3+ 离子的有效绿色发光。