Abstract A series of Ca8ZnLa(PO4)7: 0.01 Tm3+, xDy3+ (x = 0–0.15) and Ca8ZnLa(PO4)7: 0.1Dy3+ phosphors were obtained via the high temperature solid state reaction method. The crystal structure, photoluminescence properties, and energy transfer from Tm3+ to Dy3+ were investigated. The prepared phosphors possess the β-Ca3(PO4)2 structure and belong to the R3c (161) space group. The luminescent colors of Ca8ZnLa(PO4)7: 0.01 Tm3+, xDy3+ phosphors can be modulated from blue to yellow and white light emission of a single matrix was realized. In the Ca8ZnLa(PO4)7 (abbreviated as: CZLPO) matrix, the Tm3+→Dy3+ energy transfer process proceeds due to electric dipole-quadrupole interaction, and the energy transfer mechanism is explored in detail according to Dexter's energy transfer theory and Reisfeld's equation. Moreover, the CZLPO: 0.01 Tm3+, xDy3+ phosphors exhibit good thermal stability. These characteristics indicate that a single matrix CZLPO: 0.01 Tm3+, xDy3+ phosphor has a potential for applications in white LEDs.

中文翻译：

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深入了解 Tm3+ 和 Dy3+ 共掺杂 Ca8ZnLa(PO4)7 磷光体中的能量转移、颜色调谐和白光发射

摘要 采用高温固相反应法制备了一系列Ca8ZnLa(PO4)7: 0.01 Tm3+, xDy3+ (x = 0–0.15) 和Ca8ZnLa(PO4)7: 0.1Dy3+ 荧光粉。研究了晶体结构、光致发光特性以及从 Tm3+ 到 Dy3+ 的能量转移。制备的荧光粉具有β-Ca3(PO4)2结构，属于R3c(161)空间群。Ca8ZnLa(PO4)7: 0.01 Tm3+、xDy3+荧光粉的发光颜色可以从蓝色调到黄色，实现了单一基体的白光发射。在Ca8ZnLa(PO4)7（简称：CZLPO）基体中，Tm3+→Dy3+由于电偶极-四极相互作用而进行能量转移过程，根据Dexter能量转移理论和Reisfeld方程详细探讨了能量转移机制。此外，CZLPO：0.01 Tm3+，xDy3+ 荧光粉表现出良好的热稳定性。这些特性表明单矩阵 CZLPO: 0.01 Tm3+, xDy3+ 磷光体在白光 LED 中具有应用潜力。