Fluorescence and crystal structure of SrLa1−xAlO4:xEu3+ phosphor synthesized using a sol–gel method,Luminescence

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Fluorescence and crystal structure of SrLa1−xAlO4:xEu3+ phosphor synthesized using a sol–gel method
Luminescence ( IF 3.2 ) Pub Date : 2021-07-16 , DOI: 10.1002/bio.4122
Mei Yan ₁ , Cheng Yue ₁ , Yong Pu ₂ , Dachuan Zhu ₁ , Qun Yan ₁

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The SrLa_1−xAlO₄:xEu³⁺ phosphors were obtained using one calcination of a precursor synthesized using a sol–gel method. When excited at 396 nm, this phosphor emits a red light mixed with several strong peaks centred at 596 nm, 616 nm and 625 nm, attributed to ⁵D₀→⁷F_{1, 2} transitions of Eu³⁺ ions, respectively. The concentration quenching occurs at x = 1.5 mol% mol of SrLa_1−xEu_xAlO₄ and the critical energy transfer distance is calculated to be 13.13 Å, the dipole–dipole interaction was found to play a role. In addition, the colour purity could be up to 97.5%. Simultaneously, the thermal stability of SrLaAlO₄:Eu³⁺ was measured and the thermal quenching was found at c. 275°C (T_0.5), the excitation energy was 0.19 eV. Current results demonstrate that SrLaAlO₄:Eu³⁺ could be a red component candidate for white light LEDs pumped by near-UV chips.

中文翻译：

使用溶胶-凝胶法合成的 SrLa1−xAlO4:xEu3+ 荧光粉的荧光和晶体结构

SrLa _{1- x} AlO ₄ : x Eu ³⁺磷光体是使用溶胶-凝胶法合成的前体的一次煅烧获得的。当在 396 nm 激发时，该磷光体发出红光，其中包含几个集中在 596 nm、616 nm 和 625 nm 的强峰，分别归因于Eu ³⁺离子的⁵ D ₀ → ⁷ F _{1、2 次}跃迁。浓度猝灭发生在x = 1.5 mol% mol SrLa ₁₋_x Eu _x AlO ₄计算出临界能量转移距离为 13.13 Å，发现偶极-偶极相互作用起作用。此外，色纯度可达97.5%。同时，测量了 SrLaAlO ₄ :Eu ³⁺的热稳定性，发现在c处发生热淬火。275°C (T _0.5 )，激发能量为0.19 eV。目前的结果表明，SrLaAlO ₄ :Eu ³⁺可能是由近紫外芯片泵浦的白光 LED 的候选红色成分。

更新日期：2021-07-16

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