Abstract To improve the current multi-phased white-LEDs, novel down-converted Dy3+ doped layered perovskite SrLaAlO4 nanophosphors emitting cool white light were successfully fabricated by urea assisted solution combustion approach. X-ray diffractometry and Rietveld refinement revealed the 14/mmm (139) space group of tetragonal phase in doped samples (SrLa(1-x)DyxAlO4 (x = 0.01–0.10)). Morphological studies reported the nanocubic crystals (45–55 nm) while their nanocrystalline nature and (101) crystal plane was depicted by selected area electron diffraction patterns. Elemental composition of nanomaterials was detected effectively via energy dispersive X-ray analysis. The vibrational metal-oxygen bonding in the sample was confirmed by FT-IR results. Photoluminescence spectra, on near UV excitation, showed two intense bands of blue and yellow color at 484 and 574 nm subjected to transition from 4F9/2 → 6H15/2 and 6H13/2, respectively. Maximum emission intensity was noticed for 5.0 mol% amount of dopant (Dy3+) ions. Decay life time, band gap and refractive index of optimized sample were noted as 0.413 ms, 4.98 eV and 1.736, respectively. CCT value (7418 K), color purity (23.02 × 10−2) and CIE coordinates (0.308, 0.284) of SrLa0.95Dy0.05AlO4 nanophosphor were approximate to coordinates of commercial LEDs and National Television System Committee, which confirmed their excellent practicability in the advanced optoelectronic devices, especially single-phase WLEDs for the illumination purpose.

中文翻译：

---

从用于高级光电应用的新型下转换 SrLaAlO4:Dy3+ 纳米磷光体发出冷白光

摘要 为了改进目前的多相白光 LED，采用尿素辅助溶液燃烧方法成功制备了新型下转换 Dy3+ 掺杂层状钙钛矿 SrLaAlO4 纳米磷光体，发出冷白光。X 射线衍射和 Rietveld 精修揭示了掺杂样品 (SrLa(1-x)DyxAlO4 (x = 0.01–0.10)) 中四方相的 14/mmm (139) 空间群。形态学研究报告了纳米立方晶体（45-55 nm），而它们的纳米晶体性质和（101）晶面由选定的区域电子衍射图描述。通过能量色散X射线分析有效地检测了纳米材料的元素组成。FT-IR 结果证实了样品中的振动金属-氧键。近紫外激发下的光致发光光谱，分别从 4F9/2 → 6H15/2 和 6H13/2 跃迁，在 484 和 574 nm 处显示出两条强烈的蓝色和黄色带。注意到 5.0 mol% 掺杂剂 (Dy3+) 离子的最大发射强度。优化样品的衰减寿命、带隙和折射率分别为 0.413 ms、4.98 eV 和 1.736。SrLa0.95Dy0.05AlO4 纳米荧光粉的 CCT 值 (7418 K)、色纯度 (23.02 × 10−2) 和 CIE 坐标 (0.308, 0.284) 与商用 LED 和国家电视系统委员会的坐标接近，证实了它们在先进的光电器件，特别是用于照明目的的单相 WLED。0 mol% 的掺杂剂 (Dy3+) 离子。优化样品的衰减寿命、带隙和折射率分别为 0.413 ms、4.98 eV 和 1.736。SrLa0.95Dy0.05AlO4 纳米荧光粉的 CCT 值 (7418 K)、色纯度 (23.02 × 10−2) 和 CIE 坐标 (0.308, 0.284) 与商用 LED 和国家电视系统委员会的坐标接近，证实了它们在先进的光电器件，特别是用于照明目的的单相 WLED。0 mol% 的掺杂剂 (Dy3+) 离子。优化样品的衰减寿命、带隙和折射率分别为 0.413 ms、4.98 eV 和 1.736。SrLa0.95Dy0.05AlO4 纳米荧光粉的 CCT 值 (7418 K)、色纯度 (23.02 × 10−2) 和 CIE 坐标 (0.308, 0.284) 与商用 LED 和国家电视系统委员会的坐标接近，证实了它们在先进的光电器件，特别是用于照明目的的单相 WLED。