title: Luminescence and luminescence quenching of highly efficient Y2Mo4O15:Eu(3+) phosphors and ceramics.
abstract: A good LED phosphor must possess strong enough absorption, high quantum yields, colour purity, and quenching temperatures. Our synthesized Y2Mo4O15:Eu(3+) phosphors possess all of these properties. Excitation of these materials with near-UV or blue radiation yields bright red emission and the colour coordinates are relatively stable upon temperature increase. Furthermore, samples doped with 50% Eu(3+) showed quantum yields up to 85%, what is suitable for commercial application. Temperature dependent emission spectra revealed that heavily Eu(3+) doped phosphors possess stable emission up to 400 K and lose half of the efficiency only at 515 K. In addition, ceramic disks of Y2Mo4O15:75%Eu(3+) phosphor with thickness of 0.71 and 0.98 mm were prepared and it turned out that they efficiently convert radiation of 375 and 400 nm LEDs to the red light, whereas combination with 455 nm LED yields purple colour.
authors.affiliation: Department of Analytical and Environmental Chemistry, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania.
authors.forename: Matas
authors.initials: M
authors.lastname: Janulevicius
authors.affiliation: Department of Analytical and Environmental Chemistry, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania.
authors.forename: Paulius
authors.initials: P
authors.lastname: Marmokas
authors.affiliation: Department of Inorganic Chemistry, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania.
authors.forename: Martynas
authors.initials: M
authors.lastname: Misevicius
authors.affiliation: Department of Analytical and Environmental Chemistry, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania.
authors.forename: Julija
authors.initials: J
authors.lastname: Grigorjevaite
authors.affiliation: Department of Physical Chemistry, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania.
authors.forename: Lina
authors.initials: L
authors.lastname: Mikoliunaite
authors.affiliation: Department of Applied Chemistry, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania.|Institute of Chemistry, Centre for Physical Sciences and Technology, A. Gostauto 9, LT-01108 Vilnius, Lithuania.
authors.forename: Simas
authors.initials: S
authors.lastname: Sakirzanovas
authors.affiliation: Department of Analytical and Environmental Chemistry, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania.
authors.forename: Arturas
authors.initials: A
authors.lastname: Katelnikovas