TY - MGZN T1 - Temperature dependence and quantum efficiency of ultrabroad NIR photoluminescence from Ni2+centers in nanocrystalline Ba-Al titanate glass ceramics T3 - Optics Letters 37.7 (2012): S. 1166-1168. 19.11.2012 A1 - Gao,Guojun A1 - Peng,Mingying A1 - Wondraczek,Lothar Y1 - 2012/11/19 N2 - Ultrabroad near-infrared (NIR) photoluminescence from Ni2+-centers in nanocrystalline Ba-Al titanate glass ceramics was studied by temperature-dependent static and dynamic photoluminescence spectroscopy in the regime of 10 to 300 K. Photoluminescence covers the spectral range of about 1100 nm to >1600??nm with a typical bandwidth (FWHM) greater than 300 nm. For UV-LED excitation at 352 nm, an internal quantum efficiency of 65% is obtained. The excited state lifetime ? at room temperature is 39 ?s. The stimulated emission cross section ?em is 8.5×10?20??cm2, resulting in a practical figure of merit, ?em*?, of 3.3×10?24??cm2?s at room temperature. These properties suggest suitability as a broadband gain medium for tunable lasers and optical amplifiers. KW - - CY - Erlangen PB - Universitätsbibliothek der Universität Erlangen-Nürnberg AD - Universitätsstraße. 4, 91054 Erlangen L2 - http://www.opus.ub.uni-erlangen.de/opus/volltexte/2012/3893 ER -