Abstract We report on the synthesis and photoluminescent performance of the Ba2+ ions doped Eu(HCOO)3 phosphors as well as their promising applications in indoor illumination. The thermal stability of the synthesized sample with microparticles was characterized by the thermogravimetric analysis. Irradiated by 396 nm light, the unique emissions of Eu3+ ions originating from the 5D0 → 7FJ (J = 1, 2, 3, 4) transitions were observed. With the aid of the Judd-Ofelt theory, the local symmetry properties of the Eu3+ ions in the selected host were studied, revealing that the sites taken by the Eu3+ ions possessed low symmetry with non-inversion center. An enhanced luminescent intensity was seen in the resultant phosphors when the Ba2+ ions were introduced and the optimal doping content was 10 mol%. The studied samples can exhibit bright visible red emission with high color purity of 93.3% upon 396 nm excitation. Moreover, the resistance of the emission intensity to the temperature was also explored and the activation energy was 0.188 eV. Furthermore, the internal quantum efficiency of the resultant samples was 67% when excited by 396 nm. Ultimately, a light-emitting diode (LED) lamp, which emitted warm white light with high color rendering index of 80.7 and low color correlated temperature of 4715 K, was constructed, indicating the feasibility of the synthesized phosphors for white-LED.

中文翻译：

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用于白光发光二极管的 Ba2+ 离子掺杂的甲酸铕荧光粉的合成及光致发光性能

摘要 我们报告了 Ba2+ 离子掺杂的 Eu(HCOO)3 荧光粉的合成和光致发光性能及其在室内照明中的应用前景。通过热重分析表征具有微粒的合成样品的热稳定性。在 396 nm 光照射下，观察到源自 5D0 → 7FJ (J = 1, 2, 3, 4) 跃迁的 Eu3+ 离子的独特发射。借助 Judd-Ofelt 理论，研究了所选宿主中 Eu3+ 离子的局域对称性，表明 Eu3+ 离子占据的位点具有低对称性和非反转中心。当引入 Ba2+ 离子且最佳掺杂量为 10 mol% 时，在所得荧光粉中可以看到增强的发光强度。研究的样品在 396 nm 激发下可以显示出明亮的可见红色发射，具有 93.3% 的高色纯度。此外，还探索了发射强度对温度的抵抗力，活化能为0.188 eV。此外，所得样品的内量子效率在 396 nm 激发时为 67%。最终，构建了一个发光二极管 (LED) 灯，它发出的暖白光具有 80.7 的高显色指数和 4715 K 的低色相关温度，表明合成荧光粉用于白光 LED 的可行性。当被 396 nm 激发时，所得样品的内量子效率为 67%。最终，构建了一个发光二极管 (LED) 灯，它发出的暖白光具有 80.7 的高显色指数和 4715 K 的低色相关温度，表明合成荧光粉用于白光 LED 的可行性。当被 396 nm 激发时，所得样品的内量子效率为 67%。最终，构建了一种发光二极管 (LED) 灯，其发出的暖白光具有 80.7 的高显色指数和 4715 K 的低色相关温度，表明该合成荧光粉用于白光 LED 的可行性。