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Spectroscopic characteristics of Cr4+ in transparent polycrystalline Al2O3

Yang Qiu-Hong Zeng Zhi-Jiang Ding Jun Xu Jun Su Liang-Bi

Spectroscopic characteristics of Cr4+ in transparent polycrystalline Al2O3

Yang Qiu-Hong, Zeng Zhi-Jiang, Ding Jun, Xu Jun, Su Liang-Bi
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  • Received Date:  29 November 2005
  • Accepted Date:  21 April 2006
  • Published Online:  20 August 2006

Spectroscopic characteristics of Cr4+ in transparent polycrystalline Al2O3

  • 1. (1)上海大学材料科学与工程学院,上海 200072; (2)中国科学院上海光学精密机械研究所,上海 201800

Abstract: Transparent polycrystalline Cr:Al2O3 ceramics were synthesized by conventional pressureless synthesis processing. The absorption and emission spectra of Cr:Al2O3 ceramics specimens before and after annealing were measured at room temperature. It was discovered that the emission spectra of Cr4+ in Al2O3 octahedral coordination site is in infrared wavelength range of 1100—1600nm. The emission peak of Cr4+ is centered at 1223nm, which is similar to that of Cr4+ in tetrahedral site. Al2O3 has smaller lattice constant, resulting in the larger crystal field strength, so there is a blue shift in the peak of Cr4+:Al2O3 ceramics compared to those of other Cr4+-doped crystals. And the emission band is much narrower with full width at half maximum Δλ 37nm.

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