Abstract
SnO2:Mn phosphor was synthesized by chemically etching metallic Sn and Mn shots in aqueous HNO3 solution. The synthesized phosphor was investigated by photoluminescence (PL), PL excitation spectroscopies, and PL decay time measurements. The PL spectra of SnO2:Mn exhibited a strong IR emission at ∼800 nm and green/red (G/R) emission. The G/R emission band was also observed in undoped SnO2. These emission bands were attributed to the Mn2+ (IR) and Sn2+ (G/R) ions in the SnO2 host, respectively. The IR emission band exhibited multiple-peak structure with an energy interval of ∼13 meV, in agreement with the Fourier transform analysis. The activation energies of the IR and G/R emission bands were determined to be ∼0.3 eV. The PL decay times were ∼2 ms and ∼2 μs for the IR and G/R emissions, respectively. The integrated PL intensity for the IR emission band showed a gradual increase with increasing temperature at T = 20–130 K. These unique tempearture dependence and multiple-peak structure were well explained by the configurational-coordinate model with the aid of the Franck–Condon principle. Resonant energy transfer from Sn2+ to Mn2+ is the cause of an appearance of the IR emission band in SnO2:Mn.
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