Abstract The novel orange-red light emitting La7Ta3W4O30:xSm3+ (x = 0.005–0.20) phosphors were synthesized via the solid-state reaction method. The crystal structure, photoluminescence (PL) properties, optimum concentration, color purity, decay life, and thermal stability of the samples were systematically studied. Under the excitation of 404 nm, La7Ta3W4O30:Sm3+ emits intense orange-red light at 597 nm. The PL spectra of La7Ta3W4O30:Sm3+ phosphors are ascribed to the 4G5/2 to 6HJ (J = 5/2, 7/2, 9/2, and 11/2) transitions of Sm3+ ions. The concentration quenching occurs at the doping level of 1 mol%. The quenching temperature is higher than 500 K. Finally, a white LED (w-LED) with the Commission Internationale de L'Eclairage (CIE) chromaticity coordinates of (0.312, 0.296) and good color rendering index (Ra) of 86 was fabricated. As a consequence, all the results suggest that the orange-red phosphors La7Ta3W4O30:Sm3+ have potential applications in w-LEDs structures.

中文翻译：

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白光 LED 用 La7Ta3W4O30:Sm3+ 橙红色荧光粉的光谱研究

摘要 通过固态反应法合成了新型橙红色发光 La7Ta3W4O30:xSm3+ (x = 0.005–0.20) 荧光粉。系统地研究了样品的晶体结构、光致发光（PL）特性、最佳浓度、色纯度、衰变寿命和热稳定性。在 404 nm 的激发下，La7Ta3W4O30:Sm3+ 发出 597 nm 的强烈橙红色光。La7Ta3W4O30:Sm3+ 荧光粉的 PL 光谱归因于 Sm3+ 离子的 4G5/2 到 6HJ（J = 5/2、7/2、9/2 和 11/2）跃迁。浓度猝灭发生在 1 mol% 的掺杂水平。淬火温度高于 500 K。 最后，制造出国际照明委员会 (CIE) 色度坐标为 (0.312, 0.296) 且显色指数 (Ra) 为 86 的白光 LED (w-LED) .