Broadband amplification and upconversion luminescence properties of Er~(3+)/Yb~(3+) co-doped fluorophosphate glass

摘要

Broadband and upconversion properties were studied in Er~(3+)/Yb~(3+) Co-doped fluorophosphate glasses. Large Ω_6 and S_(ed)/(S_(ed) + S_(md)) values and the flat gain profile over 1530-1585 nm indicate the good broadband properties of the glass system. And a premise of using Qb as a parameter to estimate the broadband properties of the glasses is proposed for the first time to our knowledge. Results showed that fluorescence intensity, upconversion luminescence intensity, the intensity ratio of red/green light (656 nm/545 nm) are closely related to the Yb~(3+):Er~(3+) ratio and Er~(3+) concentration, and the corresponding calculated lifetime of ~4F_(9/2) and ~4S_(3/2) states for red and green upconversion samples proves this conclusion. The upconversion mechanism is also discussed.