Enhanced 5D0 → 7F4 transition and optical thermometry of garnet type Ca3Ga2Ge3O12:Eu3+ phosphors,Inorganic Chemistry Frontiers

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Enhanced 5D0 → 7F4 transition and optical thermometry of garnet type Ca3Ga2Ge3O12:Eu3+ phosphors
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-03-26 00:00:00 , DOI: 10.1039/c8qi00199e
Fengfeng Chi _{1,

2,

3,

4,

5} , Xiantao Wei _{3,

4,

6,

7,

8} , Shaoshuai Zhou _{8,

9,

10,

11} , Yonghu Chen _{1,

2,

3,

4,

5} , Changkui Duan _{1,

2,

3,

4,

5} , Min Yin _{1,

2,

3,

4,

5}

Affiliation

The garnet type phosphors of Eu³⁺ doped Ca₃Ga₂Ge₃O₁₂ were synthesized via conventional solid state reaction techniques. The phase purity and luminescence properties of the fabricated phosphors were characterized by X-ray powder diffraction, photoluminescence excitation and emission spectra, temperature dependent emission spectra as well as luminescence decay curves. The phosphors show enhanced red emission from a ⁵D₀ → ⁷F₄ transition of Eu³⁺ under the excitation of 394 nm. The unusual ⁵D₀ → ⁷F₄ intensity was explained by structural analysis. The emission intensity of the phosphors increases with the concentration of Eu³⁺ until the quenching concentration of 10 mol%. Excited by a pulsed laser of wavelength 610.8 nm, the emission intensity of the ⁵D₀ → ⁷F₄ transition increases monotonously as the temperature increases in the range of 160–360 K. The temperature dependent fluorescence behavior was investigated. The relative sensitivity reaches the maximum value of 3.66% K⁻¹ at 160 K and reaches 1.04% K⁻¹ at 300 K. The results show that the garnet type Ca₃Ga₂Ge₃O₁₂:Eu³⁺ phosphor is a promising material for the application of optical thermometry.

中文翻译：

石榴石型Ca ₃ Ga ₂ Ge ₃ O ₁₂：Eu ³⁺荧光粉的增强⁵ D ₀ → ⁷ F ₄跃迁和光学测温

通过常规的固态反应技术合成了掺有Eu ^3+的Ca ₃ Ga ₂ Ge ₃ O ₁₂的石榴石型磷光体。通过X射线粉末衍射，光致发光激发和发射光谱，与温度有关的发射光谱以及发光衰减曲线来表征所制造的磷光体的相纯度和发光性质。磷光体在394 nm激发下从Eu ³⁺的⁵ D ₀ → ⁷ F ₄跃迁显示出增强的红色发射。不寻常的⁵ D ₀ →通过结构分析解释了⁷ F₄强度。荧光体的发射强度随着Eu³⁺的浓度而增加，直到淬灭浓度为10 mol％。受波长为610.8 nm的脉冲激光激发，随着温度在160–360 K范围内升高，⁵ D₀ →⁷ F₄跃迁的发射强度单调增加。研究了温度依赖性荧光行为。相对灵敏度在160 K时达到最大值3.66％K^-1，在300 K时达到1.04％K^-1。结果表明，石榴石型Ca₃ Ga₂Ge ₃ O ₁₂：Eu ³⁺荧光粉是用于光学测温的有前途的材料。

更新日期：2018-03-26

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