Infrared-to-visible frequency upconversion in Pr3+/Yb3+- and Er3+/Yb3+-codoped tellurite glasses

Upconversion luminescence and thermal effects in Pr3+/Yb3+- and Er3+/Yb3+-codoped 60TeO2–10GeO2–10K2O–10Li2O–10Nb2O5 tellurite glasses excited by CW infrared radiation at 1.064 μm is reported. Generation of intense green and red fluorescence emission in Er3+/Yb3+-codoped samples and appreciable upconversion luminescence in the wavelength region of 450–680 nm in Pr3+/Yb3+-codoped samples is observed. Temperature-induced enhancement of ×12 in the upconversion efficiency in Er3+/Yb3+- and ×10 in the Pr3+/Yb3+-doped samples is demonstrated.