Spectroscopic properties of Pr³⁺ doped transparent oxyfluoride glass ceramie

In this paper, we reported the spectroscopic properties of praseodymium ions (Pr³⁺) doped transparent oxyfluoride glass ceramie excited with different laser lines, such as 532, 514.5 and 476.5 nm. and the spectroscopic features of Pr ions in LaF₃ nanocrystals ( NCs) and in oxide glass were presented. It was found that the population on ³P₀ state of Pr³⁺ ion in NCs and in glass can be aehieved by multi-phonon assistance process when excited by 514.5 nm laser lines. As a comparison, 476.5 nm laser line which is mainly resonant with the ³H₄ to ³P₀ transition of Pr³⁺ ions in NCs is used as the excitation source, transitions from ³P₀ state to many lower states, such as ³H₄, ³H₆, ³F₂ mani-folds were observed and it showed signifieant difference from those excited by 532 nm and 514. 5 nm laser lines in which only transition from ³P₀ to ³H₅ exists. We attribute those different spectroscopic features as selectively excita-tion of Pr³⁺ ions in different environments where exist strong/weak electron-phonon coupling in the ³P_0.1 , states of Pr ³⁺ ion in NCs and in glass. Crystallization behavior and vibrational properties of transparent glass ceramie were also stu-died by Raman spectroscopy excited by 532 nm and 514.5 nm laser lines.