Cr³⁺-doped Bi₂Ga₄O₉-Bi₂Al₄O₉ solid-solution phosphors: crystal-field modulation and lifetime-based temperature sensing

Abstract

${\mathrm{Cr}}^{3+}$-doped ${\mathrm{Bi}}_2{\mathrm{Ga}}_4{\mathrm{O}}_9\text{-}{\mathrm{Bi}}_2{\mathrm{Al}}_4{\mathrm{O}}_9$ solid-solution (SS) phosphors were fabricated to explore their possible application in fluorescence lifetime-based temperature sensing. The present samples exhibited ${}^2\mathrm{E}\to {}^4{\mathrm{A}}_2$ R-line emissions associated with ${}^4{\mathrm{T}}_2\to {}^4{\mathrm{A}}_2$ phonon sideband emissions of ${\mathrm{Cr}}^{3+}$ in the wavelength range of 600–850 nm upon the excitation of visible light. Through modifying the Al/Ga ratio in the SS hosts, the ${\mathrm{Cr}}^{3+}$ crystal field was easily tuned from intermediate to strong, being beneficial to modulate an energy gap between ${}^2\mathrm{E}$ and ${}^4{\mathrm{T}}_2$ thermally coupled emitting states. As a result, linearly temperature-sensitive fluorescence lifetime was achieved in the ${\mathrm{Cr}}^{3+}$-doped ${\mathrm{Bi}}_2{\mathrm{Ga}}_4{\mathrm{O}}_9\text{-}{\mathrm{Bi}}_2{\mathrm{Al}}_4{\mathrm{O}}_9$ SSs with a high Al/Ga ratio, enabling us to conveniently and accurately determine a temperature with a high relative sensitivity of $2.13–3.26\%{\mathrm{K}}^{-1}$.

© 2017 Optical Society of America

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