Single-phase full-spectrum white-emitting phosphors with individual activator are of great significance for avoiding unnecessary energy loss and realizing high luminescence efficiency. Herein, a novel Na₂Ca₁₇Al₂(PO₄)₁₄:Eu²⁺ phosphor is designed and the strategy of cation substitution is functioned in regulating the luminescence. The Na₂Ca₁₇Al₂(PO₄)₁₄:Eu²⁺ phosphor could realize basic full-spectrum emission under the excitation of 335 nm, but the lack of red-light component and the CIE color coordinates of (0.2291, 0.2302) can not meet the requirements for white light-emitting diodes (WLEDs). With partial or even full replacement of Na⁺ in the host with Li⁺ ions, the red-light component in the emission is efficiently improved and each emitting color reaches the appropriate proportion, achieving the cold white light at (0.3330, 0.3179). By further regulating the excitation wavelength, Li₂Ca₁₇Al₂(PO₄)₁₄:Eu²⁺ phosphor finally exhibits bright warm white emission with the color coordinates of (0.3551, 0.3448) upon 360 nm excitation and the internal quantum efficiency is 33.2%. It is due to the substitution of Na⁺ by Li⁺ ions that contributes to the redistribution of Eu²⁺ in different crystal sites and regulates the photoluminescence of this phosphor, further realizing the full-spectrum white light emission. The fabricated two WLED devices by this material with near ultraviolet chips show outstanding color rendering index of 92.7 and 96.8, respectively, revealing that this material has a promising prospect in the field of full-spectrum illumination.

中文翻译：

---

通过修饰阳离子位点设计 Eu2+ 活化的单相白光荧光粉，实现高显色性全光谱照明


具有单个活化剂的单相全光谱白光荧光粉对于避免不必要的能量损失和实现高发光效率具有重要意义。本文设计了一种新型的 Na₂Ca₁₇Al₂（PO₄）₁₄：Eu²⁺ 荧光粉，并利用阳离子取代策略调节发光。Na₂Ca₁₇Al₂（PO₄）₁₄：Eu²⁺ 荧光粉在 335nm 激发下可实现基本全光谱发射，但缺乏红光分量和 CIE 色坐标为 （0.2291， 0.2302） 无法满足白光发光二极管 （WLED） 的要求。通过用 Li⁺ 离子部分甚至全部取代宿主中的 Na⁺，发射中的红光成分得到有效改善，每种发射颜色达到适当的比例，实现 （0.3330， 0.3179） 的冷白光。通过进一步调节激发波长，Li₂Ca₁₇Al₂（PO₄）₁₄：Eu²⁺ 荧光粉在 360nm 激发下最终呈现出亮暖白光，色坐标为 （0.3551， 0.3448），内部量子效率为 33.2%。正是由于 Na⁺ 被 Li⁺ 离子取代，导致 Eu²⁺ 在不同晶体位点的重新分布，并调节该荧光粉的光致发光，进一步实现全光谱白光发射。用这种材料制造的两个带有近紫外芯片的 WLED 器件显示出 92.7 和 96 的出色显色指数。8，分别揭示了这种材料在全光谱照明领域具有广阔的前景。