Optical absorption and up-conversion luminescence of oxyfluoride glasses of the SiO 2 -PbO-PbF 2 -CdF 2 system coactivated with Yb 3+ -RE 3+ (where RE = Er, Tm, Ho, Dy, Pr or Tb). When excited by a laser diode in the IR range (960 nm), intense green, blue, and red luminescence was obtained. The color characteristics of up-conversion luminescence were determined using the CIE 1931 system. The efficiency of energy transfer from Yb 3+ ions to RE 3+ ions was determined, which was> 70% for RE = Er, Tm and Ho. For glass with Yb - Tb ions, the efficiency of cooperative energy transfer reaches 10%
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