Synthesis and photoluminescence of novel blue-emitting phosphor of Eu2+-activated fluoroborate BaGaBO3F2

Pure and Eu2+-activated fluoroborate BaGaBO3F2 was prepared using high-temperature solid-state reaction. BaGaBO3F2 is a wide band semiconductor with the indirect transition characteristic. The excitation and luminescence spectra of the phosphor were measured, and it was found that Eu2+-activated BaGaBO3F2 exhibits a bright blue color under ultraviolet (UV) light. The narrow emission band peaked at 425 nm is attributed to the transitions of 4f(6)5d & RARR;4f(7)(S-8(7/2)), and the Stokes shift estimated for this phosphor sample is 3140 cm(-1). The lifetime of the luminescence is also reported. The absolute quantum efficiency (QE) of the phosphor was evaluated, and it was found that the absolute QE decreases with increasing Eu2+ concentration. The phosphor shows an excellent quantum efficiency of 72.5% and a high thermal activation energy of 0.342 eV. The study concludes that Eu2+-doped BaGaBO3F2 phosphor has promising luminescence application abilities and can be used as a blue-emitting phosphor in a variety of applications.

Automated summary

Pure and Eu2+-activated fluoroborate BaGaBO3F2, a wide band semiconductor with indirect transition characteristic, was synthesized through high-temperature solid-state reaction. The phosphor exhibits a bright blue color under UV light and has a narrow emission band at 425 nm attributed to 4f(6)5d & RARR;4f(7)(S-8(7/2)) transitions. The Eu2+-doped BaGaBO3F2 phosphor shows a high quantum efficiency of 72.5% and can be used as a blue-emitting phosphor in various applications.