Project supported by the National Natural Science Foundation of China (Grant No. 10804015);the Science Foundation of the Education Department of Liaoning Province of China (Grant No. 2009A417)
Yb^3+:Er^3+:Tm^3+co-doped borosilicate glasses are prepared. Their strong up-conversion photoluminescence spectra in a range from ultra-violet to near-infrared, which are excited by a 978-nm laser diode, are meas...