Herein, a series of GdSr₂AlO₅:Tb³⁺,Eu³⁺ phosphors were successfully synthesized through a high temperature solid-state reaction, and their crystal structures as well as photoluminescence properties were investigated in detail. Compared to the intense emission of ⁵D₀ → ⁷F₁ or ⁵D₀ → ⁷F₂ transition of Eu³⁺, another strong emission corresponding to ⁵D₀ → ⁷F₄ was observed. Concentration quenching is not obvious in Tb³⁺ or Eu³⁺-doped GdSr₂AlO₅ because structure isolation and energy transfer (ET) of Gd³⁺ → Eu³⁺ and Gd³⁺ → Tb³⁺ were found. Moreover, the energy transfer process from Tb³⁺ to Eu³⁺ was verified by the overlap of luminescence spectra and the variation of lifetime. Energy transfer mechanism was determined to be a dipole–dipole interaction, and ET efficiency as well as quantum efficiency were also obtained. Moreover, the emission color of GdSr₂AlO₅:Tb³⁺,Eu³⁺ can be tuned from green to red by altering the ratio of Tb³⁺/Eu³⁺. These results indicate that the GdSr₂AlO₅:Tb³⁺,Eu³⁺ phosphor is a promising single-component white light-emitting phosphor.

中文翻译：

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通过有效的能量转移在 GdSr2AlO5:Tb3+,Eu3+ 荧光粉中实现从绿色到红色的可调谐发射

本文通过高温固相反应成功合成了一系列GdSr ₂ AlO ₅ :Tb ³⁺ ,Eu ^{3+荧光粉，并对其晶体结构和光致发光性能进行了详细研究。}与Eu ^3+的5 D ₀ → ⁷ F ₁或⁵ D ₀ → ⁷ F ₂跃迁的强发射相比，另一种对应于⁵ D ₀ → ⁷ F _{4的强发射}被观测到。^{在Tb 3+}或Eu ³⁺掺杂的GdSr ₂ AlO ₅中浓度猝灭不明显，因为发现了Gd ³⁺ → Eu ³⁺和Gd ³⁺ → Tb ³⁺的结构隔离和能量转移(ET) 。此外，通过发光光谱的重叠和寿命的变化验证了从Tb ³⁺到Eu ³⁺的能量转移过程。能量转移机制被确定为偶极-偶极相互作用，并且还获得了ET效率和量子效率。此外，GdSr ₂ AlO ₅ :Tb ^{3+的发光颜色},Eu ^{3+可以通过改变Tb 3+} /Eu ³⁺的比值从绿色调到红色。这些结果表明GdSr ₂ AlO ₅ :Tb ³⁺ ,Eu ³⁺荧光粉是一种很有前途的单组分白光发光荧光粉。