Czochralski growth and characterization of Dy: La3Ga5.5Nb0.5O14 single crystals

✍ Scribed by F. P. Yu; D. R. Yuan; X. Zhao; X. L. Duan; S. Y. Guo; X. F. Cheng; X. Q. Wang

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 176 KB
• Volume: 44
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.200800388

✦ Synopsis

single crystal growth, characterization, La 3 Ga 5.5 Nb 0.5 O 14 , fluorescence decay time. PACS 60.Ki, 81.10.-h Dysprosium (Dy) doped La 3 Ga 5.5 Nb 0.5 O 14 single crystals were grown by the traditional Czochralski method along z-axis. The structure of the crystal has been studied by X-ray powder diffraction method, and the unitcell parameters are calculated to be a=8.22070 Å, c=5.12533 Å and V=299.965 Å 3 . The segregation coefficient of Dy 3+ in La 3 Ga 5.5 Nb 0.5 O 14 crystal was measured by X-ray fluorescence analysis. For 1 mol% doping level in the melt, the distribution coefficient of Dy 3+ was determined to be 0.341 wt%. Specific heat, thermal expansion and transmission spectrum of Dy: La 3 Ga 5.5 Nb 0.5 O 14 single crystals have been measured. The fluorescence spectra of Dy 3+ : La 3 Ga 5.5 Nb 0.5 O 14 crystals were measured at room temperature, and there were four emission transitions occurring at 479, 576, 662 and 754 nm, respectively. The fluorescent lifetimes measurement results show 1.0% Dy: La 3 Ga 5.5 Nb 0.5 O 14 possesses shorter fluorescence decay time (303.4 µs) than does 1.0%Dy:LGS (436.12 µs).