Preparation and Spectral Properties of Er,Na∶CaF2 Transparent Ceramics
Er3+,Na+co-doped CaF2 transparent ceramics with Er3+dopant concentration of 3％and Na+of 0％,0.5％,1.0％,1.5％and 2.0％were fabricated by the vacuum hot pressing method with 16 mm in diameter and 3 mm in thickness.The average grain size of the obtained Er,Na∶CaF2 powders varied from 28 nm to 36 nm with the shape of sphere.The effects of Na+doping on the transmittance,microstructure and spectral properties of Er3+∶CaF2 transparent ceramics were investigated.The transmittance of all the obtained ceramic samples is above 84％in the wavelength of 1 000 nm.The results show that after introducing Na+into Er3+∶CaF2 transparent ceramics,charge-neutralized Er3+-Na+structure formed which prevent Er3+from clustering.The emission spectra of Er3+in CaF2 transparent ceramics at around 1.5 and 2.7 μm could be modulated by adjusting the concentration of Na+and the near-infrared fluorescence lifetime at around 1.5 μm increase with the increasing of Na+concentration,reaching a maximum of 56.75 ms.
万方数据
