A 657 nm red emission from a novel rare earth free oxide-based CaO–0.5Al₂O₃–0.5Nb₂O₅:xMn⁴⁺ (0.001 ≤ x ≤ 0.008) phosphors with high water-resistance property were prepared by solid-state reaction method. The composition and structure of the as-prepared phosphors was studied. Under relative ultraviolet (331/365 nm) and blue (465 nm) light excitation, the as-prepared phosphor presents a 657 nm red emission that assigned to the ²E_g → ⁴A_2g transition of Mn⁴⁺ ions. The red light source in CaO–0.5Al₂O₃–0.5Nb₂O₅:Mn⁴⁺ system was discussed, and the water resistance property of the phosphor was also investigated. The as-prepared phosphor presents more proper red emission position than those of similar oxide-based Mn⁴⁺-activated phosphors and shows excellent water-resistance property compared with commercial used K₂SiF₆:Mn⁴⁺ phosphor. With the further optimization of its photo-luminescent properties, the as-prepared CaO–0.5Al₂O₃–0.5Nb₂O₅:Mn⁴⁺ phosphors may find its potential application in the field of white LEDs.

中文翻译：

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新型的具有高耐水性能的无稀土氧化物基CaO-0.5Al 2 O 3 -0.5Nb 2 O 5：Mn 4+荧光粉的红色发射

从新型稀土甲657纳米的红色发射的基于氧化游离CaO-0.5Al ₂ ö ₃ -0.5Nb ₂ ø ₅：X的Mn ⁴⁺（0.001≤  X  ≤0.008）具有高耐水性的荧光体特性通过固制备态反应方法。研究了所制备的荧光粉的组成和结构。在相对紫外线（331/365 nm）和蓝色（465 nm）的光激发下，所制备的荧光粉呈现657 nm的红色发射，这与Mn ⁴⁺离子的² E _g  →  ⁴ A _2g跃迁有关。CaO–0.5Al ₂ O中的红色光源_讨论了3 –0.5Nb ₂ O ₅：Mn ⁴⁺体系，并研究了荧光粉的耐水性。与市售的K ₂ SiF ₆：Mn ⁴⁺荧光粉相比，所制备的荧光粉比类似的氧化物基Mn ⁴⁺活化的荧光粉具有更合适的红色发射位置，并显示出优异的耐水性。其光致发光性质的进一步优化，所制备的CaO-0.5Al ₂ ö ₃ -0.5Nb ₂ ø ₅：锰⁴⁺磷光体可以发现其在白色LED领域的潜在应用。