Abstract
Uniform Al2O3:Cr3+ microfibers were synthesized by using a hydrothermal route and thermal decomposition of a precursor of Cr3+ doped ammonium aluminum hydroxide carbonate (denoted as AAHC), and characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), photoluminescence (PL) spectra and decay curves. XRD indicated that Cr3+ doped samples calcined at 1473K were the most of α-Al2O3 phase. SEM showed that the length and diameter of these Cr3+ doped alumina microfibers were about 3–9μm and 300nm, respectively. PL spectra showed that the Al2O3:Cr3+ microfibers presented a broad R band at 696nm. It is shown that the 0.07mol% of doping concentration of Cr3+ ions in α-Al2O3:Cr3+ was optimum. According to Dexter's theory, the critical distance between Cr3+ ions for energy transfer was determined to be 38Å. It is found that the curve followed the single-exponential decay.
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