Abstract
Infrared-to-visible upconversion obtained under continuous-waveinfrared laser excitation has been investigated in Pr3+-dopedchalcohalide glasses for different halide (Cl, Br, I) modifiers andPr3+ concentrations. The excitation wavelength dependencesuggests two different upconversion mechanisms. When the excitationwavelength is resonant with the 1G4 state an orangefluorescence from the 1D2 state is observed which isattributed to energy-transfer upconversion, whereasnonresonant excitation at higher energies than the 1G4 leveloriginates emission from the 3P0 state. This latterupconverted emission can be attributed to excited-state anti-Stokesabsorption assisted by phonon emission. A model accountingfor the photon-ion-phonon interaction is in good agreement with theobserved temperature dependence of the excitation-upconvertedfluorescence band. Orange-to-blue upconversion has also beenobserved and analysed for all the samples.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
