title: Strong blue emission from Pr3+ ions through energy transfer process from Nd3+ to Pr3+ via Yb3+ in tellurite glass.
abstract: Energy transfer excited upconversion emission in Nd3+/Pr3+-codped tellurite glass have been studied on pumping with 800 nm wavelength. The upconversion emission bands from Pr3+ ion are observed at the 488, 524, 546, 612, 647, 672, 708 and 723 nm due to the (3P0 + 3P1)-->3H4, 3P1-->3H5, 3P0-->3H5, 3P0-->3H6, 3P0-->3F2, 3P1-->3F3, 3P0-->3F3 and 3P0-->3F4 transitions, respectively. The addition of ytterbium ions (Yb3+) on the upconversion emission intensity is also studied and result shows an eight times enhancement in the upconversion intensity at 488 nm from Pr3+ ions. The pump power and concentration dependence studies are also made. It is found that Yb3+ ions transfer its excitation energy to Nd3+ from which it goes to Pr3+. No direct transfer to Pr3+ is seen. This is verified by codoping Nd3+ and Pr3+ into the host.
authors.affiliation: Laser and Spectroscopy Laboratory, Department of Physics, Banaras Hindu University, Varanasi 221005, India.
authors.forename: Kaushal
authors.initials: K
authors.lastname: Kumar
authors.forename: S B
authors.initials: SB
authors.lastname: Rai
authors.forename: Anita
authors.initials: A
authors.lastname: Rai
mesh_terms: D003116:Color; D004735:Energy Transfer; D005898:Glass / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D009354:Neodymium / Q000737:chemistry*; D011221:Praseodymium / Q000737:chemistry*; D013053:Spectrophotometry; D013691:Tellurium / Q000737:chemistry*; D015018:Ytterbium / Q000737:chemistry*
chemical_list: D007477:Ions; D009354:Neodymium; C026660:tellurous acid; D015018:Ytterbium; D011221:Praseodymium; D013691:Tellurium