A thermally stable lithium yttrium phosphate phosphor for solid-state lighting

In this work, trivalent dysprosium was incorporated with lithium yttrium phosphate LiY5P2O13 (LYP), obtaining a yellow-emitting material. The crystallographic sites of introduced Dy3+ activators are determined through the comprehensive analysis of the XRD investigation, DFT computation, and experimental luminescence spectra. Under 353 nm excitation, the LYP:Dy3+ phosphor shows bright yellow emission owing to dominant 4F9/2 -> 6H13/ 2 transition (577 nm) of Dy3+. The luminescence quenching occurs when the Dy3+ content exceeds 0.07 mol, originating from the dipole-dipole interaction. Furthermore, the excellent thermal stability behavior (84 % at 423 K) and good resistance to color shifting (0.00634 at 473 K) for title phosphor are manifested by temperaturedependent investigation. Eventually, the w-LED fabricated with LYP:0.07Dy3+ and commercial materials exhibits stable white-emitting output (0.3595, 0.3179) with high Ra (85) and low CCT (4203 K). All the study demonstrates that the LYP:Dy3+ material is a perspective candidate in solid-state illustration field.

Automated summary

In this study, a yellow-emitting material was synthesized by incorporating trivalent dysprosium with lithium yttrium phosphate (LYP). The crystallographic sites of the introduced Dy3+ activators were determined through various analyses. It was found that the material exhibited bright yellow emission under excitation, with luminescence quenching occurring at high Dy3+ content due to dipole-dipole interaction. The material also showed excellent thermal stability and resistance to color shifting. The results indicate that LYP:Dy3+ is a promising candidate for solid-state illumination applications.