0.2 wt% pr3+-doped (100-x)(0.8ges(2) center dot 0.2ga(2)s(3)) center dot xpbi(2) (x = 5, 10, and 15) glasses as potential gain materials for mid-infrared fiber laser devices were prepared, and detection of absorption and mid-infrared emission spectra was conducted. similar to 4.6 mu m mid-infrared fluorescence emissions from pr3+ in these sulfide glasses were clearly observed at room temperature excited by a 2.01 mu m tm3+: yag ceramic laser system, and the radiative rates of pr3+ ions were calculated using the judd-ofelt theory. 68ges(2) center dot 17ga(2)s(3) center dot 15pbi(2) (sigma(abs2010) = 2.70 x 10(-20) cm(2), sigma(emi) (4600) = 8.13 x 10(-20) cm(2), tau(rad) = 6.14 ms) might be a potential gain material for mid-infrared fiber laser beyond 4 mu m.