Аннотация:The luminescent properties of co-doped Sm3+/Gd3+ in the B2O3−GeO2−PbO glass system were investigated in the temperature range of 423-673 K. Intensity of the Sm3+ band in the range of 525−540 nm(4 F3/2→6H5/2) increased with increasing temperature. The fluorescence intensity ratio (FIR) changes between the thermosensitive band and the band is attributed to transition 5G5/26H7/2 was calculated and demonstrated. The results indicate the potential of the synthesized glasses for luminescent thermometry.