Multi-color emission evolution and energy transfer behavior of La3GaGe5O16:Tb3+,Eu3+ phosphors
Multi-color emission evolution and energy transfer behavior of La3GaGe5O16:Tb3+,Eu3+ phosphors
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DOI：
10.1039/c4tc01091d
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发表时间：
2014-08
影响因子：
6.4
通讯作者：
Jun Zhou;Z. Xia
中科院分区：
文献类型：
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作者：
Jun Zhou;Z. Xia
采用高温固相反应法制备了一系列颜色可调的La3GaGe5O16：Tb3+，Eu3+绿色发光材料，并对其相结构和发光性能进行了详细的研究。从荧光光谱中可以观察到Tb3+和Eu3+的f-f跃迁产生的一系列特征发射线，并且通过微调Tb3+/Eu3+的含量比，峰值位于544 nm(绿色)和617 nm(红色)附近的两条强发射线的发射强度的变化导致了多色发射的演化。Tb~(3+)与Eu~(3+)之间的能量传递过程为偶极-偶极机制的共振型，用猝灭浓度法和光谱重叠法计算得到的晶距Rc分别为15.24和17.32A。热猝灭发光结果表明，La3GaGe5O16：Tb3+，Eu3+具有良好的热稳定性。
A series of color-tunable green-red emitting La3GaGe5O16:Tb3+,Eu3+ phosphors were prepared by a high temperature solid-state reaction, and their phase structure and photoluminescence (PL) properties were investigated in detail. A series of characteristic emission lines originated from the f–f transitions of Tb3+ and Eu3+ can be observed from the PL spectra and the emission intensities' variation of the two strong emission lines peaking at around 544 nm (green) and 617 nm (red) induced the multi-color emission evolution via the fine tuning of the Tb3+/Eu3+ content ratio. The energy transfer process between Tb3+ and Eu3+ was demonstrated to be a resonant type via a dipole–dipole mechanism, and the crystal distance Rc calculated by the quenching concentration method and the spectral overlap method was 15.24 and 17.32 A, respectively. Thermal quenching luminescence results reveal that La3GaGe5O16:Tb3+,Eu3+ exhibits good thermal stability.