中国物理B ›› 2016, Vol. 25 ›› Issue (5): 58105-058105.doi: 10.1088/1674-1056/25/5/058105
• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇 下一篇
A Kumaresh, R Arun Kumar, N Ravikumar, U Madhusoodanan, B S Panigrahi, K Marimuthu, M Anuradha
A Kumaresh1,2, R Arun Kumar1,2, N Ravikumar1,2, U Madhusoodanan3, B S Panigrahi3, K Marimuthu4, M Anuradha5
摘要:
Rare earth europium (Eu3+)-doped lithium tetraborate (Eu:Li2B4O7) crystal is grown from its stoichiometric melt by microtube Czochralski pulling technique (μT-Cz) for the first time. The grown crystals are subjected to powder x-ray diffraction (PXRD) analysis which reveals the tetragonal crystal structure of the crystals. UV-vis-NIR spectral analysis is carried out to study the optical characteristics of the grown crystals. The crystal is transparent in the entire visible region, and the lower cutoff is observed to be at 304 nm. The existence of BO3 and BO4 bonding structure and the molecular associations are analyzed by Fourier transform infrared (FTIR) spectroscopy. The results of excitation and emission-photoluminescence spectra of europium ion incorporated in lithium tetraborate (LTB) single crystal reveal that the observations of peaks at 258, 297, and 318 nm in the excitation spectra and peaks at 579, 591, 597, 613, and 651 nm are observed in the emission spectra. The chromaticity coordinates are calculated from the emission spectra, and the emission intensity of the grown crystal is characterized through a CIE 1931 (Commission International d'Eclairage) color chromaticity diagram.
中图分类号: (Methods of crystal growth; physics and chemistry of crystal growth, crystal morphology, and orientation)