Characterization of cooperative upconversion and energy transfer of Er3+ and Yb3+/Er3+ doped phosphate glasses

摘要

Abstract: Cooperative upconversion and Yb$+3$PLU$/-Er$+3$PLU$/ energy transfer in newly developed phosphate glasses were studied in this paper. The cooperative upconversion coefficients of $+4$/I$-13/2$/ level for different Er$+3$PLU$/ concentrations were deduced from the pump intensity- dependent luminescence decay curves. Yb$+3$PLU$/-Er$+3$PLU$/ energy transfer efficiencies for different Yb$+3$PLU$/ concentrations codoped with Er$+3$PLU$/ (approximately 2 $MUL 10$+20$/ ions/cm$+3$/) were estimated from the lifetime measurements of $+2$/F$-5/2$/ level of Yb$+3$PLU$/ ions. The small cooperative upconversion coefficients and high Yb$+3$PLU$/-Er$+3$PLU$/ energy transfer efficiencies indicate these newly developed Er$+3$PLU$/ and Yb$+3$PLU$//Er$+3$PLU$/ doped phosphate glasses are excellent for amplifier and laser applications.!21