Meng Qinghong, Zhao Guoying, Zhu Qi, Sun Xudong, Li Ji-Guang
Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) and School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China.
School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China.
Dalton Trans. 2022 Feb 22;51(8):3159-3169. doi: 10.1039/d1dt04183e.
Doping GdLuAlO:Ce with a Ca/Si pair produced a series of GdLuCaAlSiO:0.03Ce ( = 0.0-1.2) garnet new phosphors, and remarkable regulation of the crystal structure and Ce luminescence was achieved. Rietveld refinement and spectral analysis revealed that greater incorporation of Ca/Si led to a higher lattice rigidity by cell contraction, a narrower bandgap, a longer average bond length/less distortion of the [CeO] dodecahedron and decreased centroid shift/crystal field splitting of the Ce 5d energy level. A blue-shifted 4f-5d transition, a narrower emission band, improved thermal stability of luminescence and a shorter fluorescence lifetime were observed with increasing Ca/Si content. Applying the yellowish-green-emitting GdLuCaAlSiO:0.03Ce optimal phosphor ( = 1.2), together with a commercial CaAlSiN:Eu red phosphor, in 450 nm-excited LED lighting produced a low CCT of ∼3625 K and a high CRI/R9 of ∼95.2/94.8, indicating that the phosphor has application potential in high-performance w-WLED.
用Ca/Si对掺杂GdLuAlO:Ce制备了一系列GdLuCaAlSiO:0.03Ce（=0.0 - 1.2）石榴石新型荧光粉，并实现了对晶体结构和Ce发光的显著调控。Rietveld精修和光谱分析表明，更多的Ca/Si掺入通过晶胞收缩导致更高的晶格刚性、更窄的带隙、更长的平均键长/[CeO]十二面体更小的畸变以及Ce 5d能级的质心位移/晶体场分裂减小。随着Ca/Si含量增加，观察到4f - 5d跃迁蓝移、发射带变窄、发光热稳定性提高以及荧光寿命缩短。将发射黄绿色光的GdLuCaAlSiO:
