title: Upconversion in Er3+-doped Bi2O3-Li2O-BaO-PbO tertiary glass.
abstract: Radiative properties of Er3+-doped tertiary bismuth glass has been analyzed by the Judd-Ofelt theory. NIR to visible upconversion in the Er3+-doped glass has been reported. The mechanism for the upconversion is explained on the basis of quadratic dependence on excitation power and on the energy-matching scheme. Energy transfer is noted as the dominant process including the long-lived 4I11/2 level as the intermediate state for the green and red upconversion emissions. The effect of temperature on the fluorescence intensity of the two bands due to 2H11/2-->4I15/2 and 4S3/2-->4I15/2 transitions as well as on the transitions due to Stark components of the 4S3/2 level have been monitored and it is concluded that their intensity ratio may serve as better temperature sensing device.
authors.affiliation: Laser and Spectroscopy Laboratory, Department of Physics, Banaras Hindu University, Varanasi 221005, India.
authors.forename: Garima
authors.initials: G
authors.lastname: Tripathi
authors.forename: Vineet Kumar
authors.initials: VK
authors.lastname: Rai
authors.forename: D K
authors.initials: DK
authors.lastname: Rai
authors.forename: S B
authors.initials: SB
authors.lastname: Rai
mesh_terms: D017609:Barium Compounds / Q000737:chemistry*; D001729:Bismuth / Q000737:chemistry*; D004871:Erbium / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D007854:Lead / Q000737:chemistry*; D018020:Lithium Compounds / Q000737:chemistry*; D049449:Luminescence; D010087:Oxides / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013055:Spectrophotometry, Infrared; D055672:Static Electricity; D013696:Temperature
chemical_list: D017609:Barium Compounds; D018020:Lithium Compounds; D010087:Oxides; D007854:Lead; C047365:lead oxide; C077606:barium oxide; D004871:Erbium; C033301:bismuth oxide; D001729:Bismuth