Shilpa C K, Abin Prasanth M V, Jasira S V, Veena V P, Nissamudeen K M
School of Pure and Applied Physics, Kannur University, Payyanur Campus, Edat, Kannur, 670327, Kerala, India.
School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam, Kerala, 686560, India.
J Fluoresc. 2025 Apr;35(4):1995-2012. doi: 10.1007/s10895-024-03651-7. Epub 2024 Mar 12.
The current research illustrates excitation energy-triggered photoluminescent characteristics of Prions in SrCeO providing a practical approach for developing high CRI wLED and its applications. SrCeO: xPr (x = 0, 0.005, 0.01, 0.02, 0.03 wt) perovskites synthesized by fuel excess gel combustion method generate high CRI (98) for wLED applications. Crystalline phosphors with orthorhombic structures having space group Pnma were confirmed by XRD. The unit cell volume expansion occurred with an increase in Pr concentration was verified through the Rietveld refinement technique. Surface morphology, particle distribution, and size were observed via FE-SEM imaging, and detected a well-defined regular distorted spherical structure with average grain size 0.826 μm for Pr doped SrCeO. Elemental mapping and EDS analysis identified the uniform distribution and elemental purity of SrCeO: 0.01 Pr. Further, the molecular vibrations and modes were analyzed from the Raman spectrum. Moreover, the average particle size assessed via TEM analysis was found to be ~83.2 nm, consistent with XRD analysis. UV-visible absorption spectra for optical energy-band gap analysis showed a decrease in band gap energy with an increase in Pr concentration, realizing an effective energy transfer from Ce to Pr. PL measurements showed a huge variety of emission transitions, corresponding to excitations 290 nm, 321 nm, 373 nm, and 449 nm. The critical dopant concentration instigated by concentration quenching was 1 wt% Pr, ascribed to dipole-dipole interaction. The fluorescence lifetime of the optimal sample was 4.835 μs. Commission International de I'Eclairage (CIE) diagram exposes the white light emanation of SrCeO: Pr. Among which white light with high CRI (98) and comparably low CCT (~6311 K) was obtained for SrCeO: 0.01 Pr at 373 nm excitation. The obtained results recommend that SrCeO: Pr perovskite as an efficient white phosphor for fabricating high-performance wLEDs.
当前的研究阐述了激发能量引发的SrCeO中朊病毒的光致发光特性，为开发高显色指数的白光发光二极管及其应用提供了一种实用方法。通过燃料过量凝胶燃烧法合成的SrCeO:xPr（x = 0、0.005、0.01、0.02、0.03 wt）钙钛矿在白光发光二极管应用中产生了高显色指数（约98）。通过X射线衍射（XRD）证实了具有空间群Pnma的正交结构的结晶磷光体。通过Rietveld精修技术验证了随着Pr浓度增加而发生的晶胞体积膨胀。通过场发射扫描电子显微镜（FE-SEM）成像观察了表面形态、颗粒分布和尺寸，并检测到Pr掺杂的SrCeO具有明确的规则扭曲球形结构，平均晶粒尺寸为0.826μm。元素映射和能谱分析（EDS）确定了SrCeO:0.01 Pr的均匀分布和元素纯度。此外，从拉曼光谱分析了分子振动和模式。此外，通过透射电子显微镜（TEM）分析评估的平均粒径约为83.2nm，与XRD分析结果一致。用于光学能带隙分析的紫外-可见吸收光谱表明，随着Pr浓度的增加，带隙能量降低，实现了从Ce到Pr的有效能量转移。光致发光（PL）测量显示了与290nm、321nm、373nm和449nm激发相对应的多种发射跃迁。由浓度猝灭引发的临界掺杂剂浓度为1wt% Pr，归因于偶极-偶极相互作用。最佳样品的荧光寿命为4.835μs。国际照明委员会（CIE）图显示了SrCeO:Pr的白光发射。其中，在373nm激发下，SrCeO:0.01 Pr获得了高显色指数（约98）和相对较低的相关色温（约6311K）的白光。所得结果表明，SrCeO:Pr钙钛矿是一种用于制造高性能白光发光二极管的高效白色磷光体。
