abstract
Praseodymium doped lead telluroborate (PTBPr) glasses were prepared by conventional melt quenching method. The absorption spectra have been analyzed to evaluate the intensity parameters applying the standard and the modified Judd-Ofelt theories. The emission spectra under P-3(2) level excitation (lambda(ex)=447 nm) were investigated to estimate the laser characteristic parameters. These emission measurements together with Judd-Ofelt intensity parameters (Omega(lambda)=2,4,6) have been used to calculate the radiative transition probabilities, fluorescence branching ratios and radiative lifetimes of the transitions from P-3(0) and D-1(2) levels to their lower lying levels. The quenching of fluorescence intensity and experimental lifetime with the increase of Pr3+ concentration and the shift of D-1(2) -> H-3(4) emission peak towards longer wavelengths was discussed. The non-radiative losses due to multiphonon and energy transfer relaxations were also explained. The Commission Internationale de l'Eclairage (CIE) coordinates, color purity and optical band gap energy values were evaluated. Some of the basic laser characteristics such as stimulated emission cross-section, optical and bandwidth gain parameters and fluorescence quantum efficiency were also reported. (C) 2012 Elsevier B.V. All rights reserved.
keywords
RARE-EARTH IONS; OPTICAL-ABSORPTION; OXYFLUORIDE GLASS; FLUORESCENCE PROPERTIES; TELLURITE GLASSES; FLUORIDE GLASSES; ENERGY-TRANSFER; PR3+; INTENSITIES; TRANSITIONS
subject category
Materials Science
authors
Kumar, MVV; Gopal, KR; Reddy, RR; Reddy, GVL; Hussain, NS; Jamataiah, BC
our authors
Bungala Chinna Jamalaiah
Post-doc FellowshipGroups
acknowledgements
One of the authors Dr. B.C. Jamalaiah would like to thank the Fundacao para a Ciencia e a Tecnologia (FCT), Ministerio da Educacao e Ciencia, Portugal for supporting him as a Post-Doctoral Researcher wide Ref. No. SFRH/BPD/76581/2011.