title: Hydrothermal synthesis and photoluminescence investigation of NaY(MoO4)2:Eu3+ nanophosphor.
abstract: An intense red-emitting NaY(MoO4)2:Eu3+ nanophosphor was developed using a hydrothermal technique. A highly pure and single-phase NaY(MoO4)2:Eu3+ nanopowder was obtained after sintering the as-prepared sample at 800 degrees C. The crystal structure and photoluminescence properties of this double molybdate were investigated. X-ray diffraction analysis showed that the NaY(MoO4)2 nanoparticles have a scheelite-type tetragonal structure, without mixed phases. Rietveld analysis provided the atomic coordinates and Mo-O-rare-earth angles. The morphology of the molybdate precursor was controlled by adjusting the synthesis conditions. The pH was found to play a crucial role in the particle size and morphology distribution. The crystalline powder phosphor exhibited intense and efficient red emissions attributed to efficient energy-transfer from MoO4(2-) to Eu3+. The chromaticity coordinates (x,y) of the NaY(MoO4)2:Eu3+ phosphor sample correspond to (0.662, 0.337). The NaY(MoO4)2:Eu3+ powder exhibited a deep-red emission under near-ultraviolet (UV) excitation, indicating a promising red phosphor for white-light-emitting diodes based on near-UV light-emitting diodes.
authors.forename: Sung Wook
authors.initials: SW
authors.lastname: Park
authors.forename: Hyeon Mi
authors.initials: HM
authors.lastname: Noh
authors.forename: Byung Kee
authors.initials: BK
authors.lastname: Moon
authors.forename: Byung Chun
authors.initials: BC
authors.lastname: Choi
authors.forename: Jung Hyun
authors.initials: JH
authors.lastname: Jeong
authors.forename: Hyun Kyoung
authors.initials: HK
authors.lastname: Yang
mesh_terms: D005063:Europium / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D049408:Luminescent Agents / Q000737:chemistry*; D008982:Molybdenum / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D012964:Sodium / Q000737:chemistry*; D014466:Ultraviolet Rays; D015019:Yttrium / Q000737:chemistry*
chemical_list: D049408:Luminescent Agents; C044659:molybdate; D005063:Europium; D015019:Yttrium; D008982:Molybdenum; D012964:Sodium