Oxygen vacancy substitution tuning photoluminescence of self-activated LiGaSi(1-)Ge O4 phosphors

Structures, photoluminescence, and principles of self-activated phosphors

“…Ma 96 investigated the properties of self-activated yellow-emitting BaLuAl x Zn 4− x O 7−(1− x )/2 phosphor and reported that the self-activated luminescence mechanism is ascribed to the O-vacancies. Zhao 97 synthesized a series of self-activated luminescent materials, LiGaSi (1− x ) Ge x O 4 ( x = 0, 0.2, 0.4, 0.6, 0.8, 1.0), via a high-temperature solid-state method. It was illustrated that the PLE and PL spectra of LiGaSiO 4 exhibit a redshift with an increase in Ge content, which illuminated that the PL spectra of LGSO can be modulated by substituting Ge for Si.…”

Defect-induced deep red luminescence of CaGdAlO4-type layered perovskites: multi-cationic sites partial/full substitution and application in pc-LED and plant lighting

“…The origin of the visible self-luminescence is usually attributed to the presence of various oxygenrelated defects including oxygen vacancies (V O ) and interstitial oxygen (O i ) according to previous reports. [15][16][17][18] The amount of interstitial oxygen in the crystal of the prepared material will be reduced by annealing under a reducing atmosphere 19 and that of oxygen vacancies will be reduced under an O 2 atmosphere. Thus, CaGdAlO 4 powders were synthesized in ambient air, N 2 , and a 10 vol% H 2 + 90 vol% N 2 gas mixture, respectively, for comparison.…”