β-Ca₃(PO₄)₂ type phosphors Ca₉Tb(PO₄)₇:Mn²⁺ were fabricated by high temperature solid state reaction. Under 377 nm light excitation, the Ca₉Tb(PO₄)₇ host displays the green emission attributable to the characteristic emission of Tb³⁺ ions peaking at 488, 542, 586, and 620 nm, respectively. The red broadband emission is observed when Ca₉Tb(PO₄)₇ is doped with Mn²⁺ ions. The emission is attributed to the energy transfer from Tb³⁺ to Mn²⁺ ions; this facilitates the realization of the tunable green–red emission. The energy transfer mechanism from Tb³⁺ to Mn²⁺ is defined as quadrupole–quadrupole interaction. Furthermore, the thermal stability of Ca₉Tb(PO₄)₇:Mn²⁺ samples has been studied, and it can maintain half the emission intensity exceeding 424 K. This demonstrates their potential applications in white light LEDs (w-LEDs).

中文翻译：

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基于Mn2 +调控和能量转移的Mn2 +掺杂Ca9Tb（PO4）7荧光体中的新型可调绿-红发光

β-的Ca ₃（PO ₄）_2种型荧光体的Ca ₉铽（PO ₄）₇：锰²⁺采用高温固相反应来制造。在377 nm光激发下，Ca ₉ Tb（PO ₄）₇主体显示绿色发射，这归因于Tb ³⁺离子的特征发射分别在488、542、586和620 nm处达到峰值。当Ca ₉ Tb（PO ₄）₇掺杂有Mn ²⁺离子时，观察到红色宽带发射。发射归因于Tb ³⁺的能量转移Mn ²⁺离子；这有助于实现可调的绿-红发射。从Tb ³⁺到Mn ²⁺的能量转移机理定义为四极-四极相互作用。此外，已经研究了Ca ₉ Tb（PO ₄）₇：Mn ²⁺样品的热稳定性，并且可以保持超过424 K的一半发射强度。这证明了它们在白光LED（w-LED）中的潜在应用。