Abstract
We report the infrared-to-visible upconversion luminescence of -doped lead–niobium–germanate glasses with different concentrations (0.5, 1, 2, and 3 wt.%) under continuous-wave and pulsed-laser excitation in the near-infrared region inside the level. Intense green emission due to the transitions was observed at room temperature together with a weak red emission corresponding to the transition. These upconversion emissions are attributed to a two-photon process. The time evolution of the green emission from the level indicates that energy-transfer upconversion and excited-state absorption are responsible for the upconversion luminescence. The increase of the weak red emission with increasing concentration, together with its temporal behavior under infrared excitation, suggests that for concentrations higher than 1 wt.%, the upconverted red emission is the result of multiphonon relaxation from the level and energy-transfer processes.
© 2004 Optical Society of America
Full Article | PDF ArticleMore Like This
R. Balda, M. Sanz, J. Fernández, and J. M. Fdez-Navarro
J. Opt. Soc. Am. B 17(10) 1671-1677 (2000)
Vineet Kumar Rai and Pankaj Mishra
J. Opt. Soc. Am. B 31(5) 1041-1045 (2014)
Zhongmin Yang, Shiqing Xu, Lili Hu, and Zhonghong Jiang
J. Opt. Soc. Am. B 21(5) 951-957 (2004)