Abstract
A red phosphor K 2SnF 6·H 2O:Mn 4+ has been synthesized from metallic tin by wet chemical etching in HF/KMnO 4 mixed solution. The X-ray diffraction pattern suggests that the red phosphor has the form of K 2SnF 6·H 2O with the orthorhombic structure (space group = D 2 h 24 - Fddd ). The luminescent properties of K 2SnF 6·H 2O:Mn 4+ are studied using photoluminescence (PL) and PL excitation spectroscopy. The room-temperature zero-phonon line emission and excitation energies in K 2SnF 6·H 2O:Mn 4+ are found to occur at ∼2.0 eV ( 2 E → 4 A 2), ∼2.42 eV ( 4 A 2 → 4 T 2), and ∼2.87 eV ( 4 A 2 → 4 T 1). Some local vibronic modes and also zero-phonon line emission doubly split being due to the hydration-related orthorhombic distortion of the MnF 6 2 - octahedron in the K 2SnF 6·H 2O host lattice.
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