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A structural design strategy was employed to develop NaGd 2 Ga 2 InGe 2 O 12:Sm 3+ (NGGIG:Sm 3+ ) garnet phosphors, optimizing the local coordination environment to enhance luminescence performance. By tailoring site occupation, Sm 3+ ions were incorporated into an asymmetric crystal field, where a statistical probability model confirmed that ∼97% of Sm 3+ ions reside in distorted coordination environments, promoting electric dipole(ED) transitions. The phosphors exhibit a high red-to-orange ( R / O ) intensity ratio of 2.97, contributing to enhanced red emission. CIE chromaticity coordinates of (0.61, 0.39) indicate a significant shift toward the red region, and the phosphors retain over 70% of their luminescence intensity at 400 K, demonstrating good thermal stability. These characteristics make NGGIG:Sm 3+ a promising candidate for high-performance red phosphors in solid-state lighting applications, highlighting the effectiveness of site engineering in garnet structures for optimizing luminescence efficiency and stability.
Feng et al. (Wed,) studied this question.