Abstract
This article reports a simple and green synthesis route for the preparation of Er3+/Yb3+−co doped KAlF4 upconversion phosphor. When annealed at 450 °C, the crystalline phase of KAlF4 host changes from monoclinic to tetragonal. Upon 980 nm light irradiation, KAlF4: Er3+phosphor shows two emission bands centred at 662 nm (4F9/2 → 4I15/2) and834 nm (4S3/2 → 4I13/2)respectively, in which the red emission band corresponds to the intra-4f transitions of Er3+ ions and hence the upconversion luminescence mechanism observed due to the two-photon process. With co-doping of Yb3+ ions, upconversion luminescence in KAlF4: Er3+ phosphor enhanced to few extend andexhibit two strong emission band appears invisible spectral range that consists ofstrong red emission bandand two high-moderate green emission band. As a result, Er3+/Yb3+ co-dopedKAlF4, laser-light excited upconversion phosphor may be an excellent candidate for bioimaging applications.
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