title: Preparation and characterization of nanocrystalline ZrO2:Yb3+,Er3+ up-conversion phosphors.
abstract: Nanocrystalline up-converting phosphors with zirconium oxide (ZrO(2)) as the host lattice were prepared with combustion and sol-gel methods. Impurities were analyzed with Fourier transform infrared (FT-IR) spectroscopy. Yb(3+) absorption was studied in the wave number region 10,000-11,500 cm(-1) at room temperature and at 10 K. The whole-blood absorption was measured in the region 9100-41,600 cm(-1) at room temperature. Up-conversion luminescence was excited at room temperature with an IR-laser at 977 nm. The up-conversion luminescence spectra showed red (650-685 nm) and green emission (520-560 nm) due to the (4)F(9/2) --> (4)I(15/2) and ((2)H(11/2), (4)S(3/2)) --> (4)I(15/2) transitions of Er(3+), respectively. The materials prepared with combustion synthesis were found to yield the most efficient up-conversion intensity and the longest luminescence decay.
authors.affiliation: University of Turku, Department of Chemistry, FI-20014 Turku, Finland.
authors.forename: Iko
authors.initials: I
authors.lastname: Hyppänen
authors.forename: Jorma
authors.initials: J
authors.lastname: Hölsä
authors.forename: Jouko
authors.initials: J
authors.lastname: Kankare
authors.forename: Mika
authors.initials: M
authors.lastname: Lastusaari
authors.forename: Laura
authors.initials: L
authors.lastname: Pihlgren
mesh_terms: D000042:Absorption; D004871:Erbium / Q000737:chemistry*; D007477:Ions; D007834:Lasers; D049449:Luminescence; D053758:Nanoparticles / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods*; D044367:Phase Transition; D010777:Photochemistry / Q000379:methods; D013055:Spectrophotometry, Infrared / Q000379:methods; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*; D013696:Temperature; D013997:Time Factors; D015018:Ytterbium / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry
chemical_list: D007477:Ions; D004871:Erbium; D015040:Zirconium; D015018:Ytterbium; C028541:zirconium oxide