Green and red luminescence of YSGG : Er under up-conversion and regular excitation at different Er concentrations

Abstract

Green and red luminescence in Er-doped YSGG, excited in the infrared or blue, is investigated at two different Er concentrations, 1% and 30%. It is found that the green and red up-conversion luminescence under the infrared excitation in 30%Er : YSGG is much stronger than that in 1%Er : YSGG. Under the blue excitation, however, the green luminescence in 30%Er : YSGG is much weaker than that in 1%Er : YSGG. It is also found that the red luminescence in the low Er concentration (1%) doped YSGG is always very weak with either pumping scheme. The infrared to green and red up-conversion luminescence in Er : YSGG is shown to be mainly due to energy transfer up-conversion.