title: Structural and spectroscopic diagnosis of Eu:ZnO and Eu:Yb:ZnO glass and ceramics.
abstract: Eu and Eu:Yb codoped ZnO nanocrystals embedded in B(2)O(3) glass matrix were synthesized and their structural, optical properties were discussed. On excitation with 532 nm laser radiation intense orange/red emissions from Eu(3+) ions were observed. The fluorescence intensity was found to enhance on annealing. Frequency upconversion emissions from Eu(3+) ions were observed in presence of Yb(3+) ions on excitation with NIR (976 nm) laser. The enhancement in emission intensity was explained and the photo-physics involved is linked with the unique structural properties of the crystallites formed. Ion interactions and the different energy transfer parameters were also calculated.
authors.affiliation: Laser and Spectroscopy Laboratory, Department of Physics, Banaras Hindu University, Varanasi 221005, India.
authors.forename: A
authors.initials: A
authors.lastname: Bahadur
authors.forename: Y
authors.initials: Y
authors.lastname: Dwivedi
authors.forename: S B
authors.initials: SB
authors.lastname: Rai
mesh_terms: D002516:Ceramics / Q000737:chemistry*; D005063:Europium / Q000737:chemistry*; D005453:Fluorescence; D005898:Glass / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D013057:Spectrum Analysis; D015018:Ytterbium / Q000737:chemistry*; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D005063:Europium; D015018:Ytterbium; D015034:Zinc Oxide