Synthesis and photoluminescence of novel blue-emitting phosphor of Eu2+-activated fluoroborate BaGaBO3F2 |
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Authors: | Suyin Zhang Qinhua Wei Hang Yin Gao Tang Zhenhua Chen Xiaoli Xu Laishun Qin |
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Affiliation: | College of Materials and Chemistry, China Jiliang University, Hangzhou, China |
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Abstract: | 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 4f65d→4f7(8S7/2), 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. |
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Keywords: | inorganic compounds luminescence optical materials and properties phosphors rare earth ions semiconductor |
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