Effect of bismuth oxide introduction on spectroscopic properties of Er 3+/Yb 3+ co-doped aluminophosphate glasses

Abstract

The absorption spectra, emission spectra and infrared spectra of Er 3+/Yb 3+ co-doped xBi 2O 3–(65 − x)P 2O 5–4Yb 2O 3–11Al 2O 3–5BaO–15Na 2O were measured and investigated. Spontaneous emission probability, radiative lifetime and branching ratios of Er 3+ were calculated according to the Judd–Ofelt theory. The role of substitution of Bi 2O 3 for P 2O 5 on luminescence of Er 3+/Yb 3+ co-doped aluminophosphate glasses has been investigated. The calculated radiative lifetimes ( τ rad) for 4I 13/2 and 4I 11/2 were decreasing with Bi 2O 3 content increases, whereas the measured total lifetime ( τ meas) for 4I 13/2 showed linearly increasing trends. The effect of Bi 2O 3 introduction on OH − groups was also discussed according to the IR transmittance spectra of glasses. It was found that FWHM of glasses were not affected with the substitution of Bi 2O 3 for P 2O 5. The emission spectra intensity increased with Bi 2O 3 content due to the decreases of phonon energy and OH − content in glasses.