Abstract The novel orange-red-emitting CaY0·5Ta0·5O3:xSm3+ phosphors (x = 0.01–0.30) with double perovskite structures are prepared by a solid-state reaction. X-ray diffraction (XRD) patterns, photoluminescence, thermal quenching mechanism, and decay curves of the phosphors are discussed. The CaY0·5Ta0·5O3:Sm3+ phosphor shows the orange-red emission (603 nm) under 407 nm excitation. The photoluminescence (PL) spectra of CaY0·5Ta0·5O3:Sm3+ phosphor are ascribed to the 4G5/2 to 6HJ (J = 5/2, 7/2, 9/2, and 11/2). The quenching concentration of CaY0·5Ta0·5O3:Sm3+ phosphor is approximately 2 mol%. The quenching temperature for CaY0·5Ta0·5O3:0.02Sm3+ is estimated more than 500 K, indicating the products have excellent thermal stability. The temperature-dependent luminescence intensity ratio (I650 nm/I603 nm) of CaY0·5Ta0·5O3:0.02Sm3+ phosphor is discussed. The electroluminescence (EL) spectrum of the packaged red LED is similar to the PL spectrum of CaY0·5Ta0·5O3:Sm3+ phosphor. The CIE coordinates of the packaged white LED are (0.307, 0.335), which approach the equal energy white light. Therefore, Sm3+-doped CaY0·5Ta0·5O3 phosphors have a promising application in white light-emitting diodes.

中文翻译：

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具有高热稳定性的橙红色 Sm3+ 掺杂双钙钛矿 CaY0·5Ta0·5O3 荧光粉用于白光 LED 应用

摘要 通过固态反应制备了具有双钙钛矿结构的新型橙红色发光CaY0·5Ta0·5O3:xSm3+荧光粉(x = 0.01–0.30)。讨论了荧光粉的 X 射线衍射 (XRD) 图案、光致发光、热猝灭机制和衰减曲线。CaY0·5Ta0·5O3:Sm3+ 荧光粉在 407 nm 激发下显示橙红色发射 (603 nm)。CaY0·5Ta0·5O3:Sm3+ 荧光粉的光致发光 (PL) 光谱归因于 4G5/2 至 6HJ (J = 5/2、7/2、9/2 和 11/2)。CaY0·5Ta0·5O3:Sm3+荧光粉的猝灭浓度约为2mol%。CaY0·5Ta0·5O3:0.02Sm3+的淬火温度估计超过500 K，表明产品具有优良的热稳定性。CaY0·5Ta0·5O3:0随温度变化的发光强度比(I650 nm/I603 nm)。讨论了 02Sm3+ 磷光体。封装的红色 LED 的电致发光 (EL) 光谱类似于 CaY0·5Ta0·5O3:Sm3+ 荧光粉的 PL 光谱。封装后的白光 LED 的 CIE 坐标为 (0.307, 0.335)，接近等能量白光。因此，Sm3+掺杂的CaY0·5Ta0·5O3荧光粉在白光发光二极管中具有广阔的应用前景。