Abstract Novel yellow-emitting phosphors of Dy3+-doped double perovskite Ca2MgTeO6 were synthesized by using a conventional high-temperature solid-state reaction. The phase purity, particle morphology, size distribution, elemental composition, luminescence properties, and luminescence decay curves of the resulting products were then analyzed in detail. The Ca2MgTeO6:Dy3+, Na+ phosphors show three emission peaks after near-ultraviolet excitation at 350 nm, which correspond to 4F9/2→6H11/2 transition, 4F9/2→6H13/2 transition, and 4F9/2→6H13/2 transition, respectively. Among them, the strongest is observed at 573 nm. The best doping content of Dy3+ in Ca2MgTeO6:xDy3+, xNa+ phosphors is x = 5 mol%. The calculated critical distance of energy transfer between Dy3+ ions is 1.6 nm. Luminescence quenching is confirmed to be due to dipole–dipole interactions among Dy3+ ions. The phosphors show excellent thermal stability with high activation energy (0.27 eV). The Commission Internationale de l'Eclairage (CIE) chromaticity coordinates of the Ca2MgTeO6:Dy3+,Na+ phosphors are located in the yellow region. White light-emitting diodes (w-LEDs) are fabricated with a high color rendering index (Ra) of 88 and good correlated color temperature (CCT) of 5440 K. All observed properties indicate that Ca2MgTeO6:Dy3+,Na+ phosphors have potential applications in display and photonic devices.

中文翻译：

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用于白光 LED 的新型双钙钛矿 Ca2MgTeO6:Dy3+,Na+ 荧光粉的合成和光学性能

摘要 采用常规的高温固相反应合成了 Dy3+ 掺杂双钙钛矿 Ca2MgTeO6 的新型黄色荧光粉。然后详细分析所得产物的相纯度、颗粒形态、尺寸分布、元素组成、发光性质和发光衰减曲线。Ca2MgTeO6:Dy3+, Na+ 荧光粉在 350 nm 近紫外激发后显示三个发射峰，分别对应于 4F9/2→6H11/2 跃迁、4F9/2→6H13/2 跃迁和 4F9/2→6H13/2 跃迁， 分别。其中，最强的是在 573 nm 处观察到。Ca2MgTeO6:xDy3+, xNa+ 荧光粉中 Dy3+ 的最佳掺杂量为 x = 5 mol%。Dy3+ 离子之间能量转移的计算临界距离为 1.6 nm。已确认发光猝灭是由于 Dy3+ 离子之间的偶极-偶极相互作用。荧光粉表现出优异的热稳定性和高活化能 (0.27 eV)。Ca2MgTeO6:Dy3+,Na+ 荧光粉的国际照明委员会 (CIE) 色度坐标位于黄色区域。制造的白光发光二极管 (w-LED) 具有 88 的高显色指数 (Ra) 和 5440 K 的良好相关色温 (CCT)。所有观察到的特性表明 Ca2MgTeO6:Dy3+,Na+ 荧光粉在以下领域具有潜在应用显示和光子设备。Na+ 荧光粉位于黄色区域。制造的白光发光二极管 (w-LED) 具有 88 的高显色指数 (Ra) 和 5440 K 的良好相关色温 (CCT)。所有观察到的特性表明 Ca2MgTeO6:Dy3+,Na+ 荧光粉在以下领域具有潜在应用显示和光子设备。Na+ 荧光粉位于黄色区域。制造的白光发光二极管 (w-LED) 具有 88 的高显色指数 (Ra) 和 5440 K 的良好相关色温 (CCT)。所有观察到的特性表明 Ca2MgTeO6:Dy3+,Na+ 荧光粉在以下领域具有潜在应用显示和光子设备。