Enhanced luminescence properties of Ca1+xSr2-xAl2O6:Eu3+ (0 ≤ x ≤ 1) red phosphors based on composition modulation

A series of solid solution Ca1+xSr2-xAl2O6:Eu3+ (0 <= x <= 1) phosphors has been successfully synthesized via a high-temperature solid-state method. The phase structures, photoluminescence performances, and fluorescence lifetimes, as well as the thermal stability properties, have been systematically investigated. All of the samples possess a cubic structure system and belong to the Pa3(205) space-group. Owing to the D-5(0) -> F-7(2) transition of the Eu3+ ions, the photoluminescence emission (PL) spectra demonstrate a strong red emission band at around 612 nm. As the Sr2+ ions have been substituted by Ca2+ ions in the CaSr2Al2O6:Eu3+ composition, the luminous intensities are gradually enhanced owing to the average bond lengths of Ca-O, Sr/Ca-O, and Sr-O, which are shorter. In addition, the PL intensities at 423 K for the CaSr2Al2O6:0.02Eu(3+), Ca1.5Sr1.5Al2O6:0.02Eu(3+), and Ca2SrAl2O6:0.02Eu(3+) phosphors retain 84.5%, 76.1%, and 75.7% of their intensities, respectively, compared with their initial intensities at 303 K. The results demonstrate that high-performance Eu3+-activated red-emitting phosphors can be obtained via cation substitution.

Automated summary

A series of solid solution Ca1+xSr2-xAl2O6:Eu3+ (0 <= x <= 1) phosphors were successfully synthesized via a high-temperature solid-state method. The study systematically investigated the phase structures, photoluminescence performances, fluorescence lifetimes, and thermal stability properties of the materials. Results showed that high-performance Eu3+-activated red-emitting phosphors can be achieved through cation substitution, with improvements in luminous intensities and thermal stability.