Al2O3:Cr3+ microfibers by hydrothermal route: Luminescence properties

作者：Liu Dianguang; Zhu Zhenfeng^*; Liu Hui; Zhang Zhengyang; Zhang Yanbin; Li Gege

来源：Materials Research Bulletin, 2012, 47(9): 2332-2335.

DOI：10.1016/j.materresbull.2012.05.026

• Optical materials
• Luminescence
• Optical properties

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 1473 K were the most of alpha-Al2O3 phase. SEM showed that the length and diameter of these Cr3+ doped alumina microfibers were about 3-9 mu m and 300 nm, respectively. PL spectra showed that the Al2O3:Cr3+ microfibers presented a broad R band at 696 nm. It is shown that the 0.07 mol% of doping concentration of Cr3+ ions in alpha-Al2O3:Cr3+ was optimum. According to Dexter's theory, the critical distance between Cr3+ ions for energy transfer was determined to be 38 angstrom. It is found that the curve followed the single-exponential decay.

• 出版日期2012-9
• 单位陕西科技大学