title: Wide-band excited Y6(WMo)(0.5)O12:Eu red phosphor for white light emitting diode: structure evolution, photoluminescence properties, and energy transfer mechanisms involved.
abstract: Y6(WMo)(0.5)O12 activated with Eu(3+) ions was investigated as a red-emitting conversion phosphor for white light emitting diodes (WLEDs). The phosphors were synthesized by calcining a citrate-complexation precursor at different temperatures. The photoluminescence properties of the phosphors and the energy transfer mechanisms involved were studied as a function of structure evolution. It was found that the host lattices were crystallized in a cubic or a hexagonal phase depending on the synthesis conditions. Although all the phosphors showed intensive red emission under an excitation of near-UV or blue light due to energy transfer from the host lattices to Eu(3+) ions, the photoluminescence spectra and temporal decay features were found to vary significantly with the structure and crystallinity of the host lattice. The mechanisms of the energy transfer from the host lattices to Eu(3+) ions and energy quenching among Eu(3+) ions were discussed on the basis of structure evolution of the host lattice. Phosphors calcined at 800 and 1300 °C were suggested to be promising candidates for blue and near-UV light excited WLEDs, respectively.
authors.affiliation: Department of Materials Science and Engineering, Liaocheng University , Liaocheng 252059, P. R. China.
authors.forename: Huaiyong
authors.initials: H
authors.lastname: Li
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: Kiwan
authors.initials: K
authors.lastname: Jang
authors.forename: Ho Sueb
authors.initials: HS
authors.lastname: Lee
authors.forename: Soung Soo
authors.initials: SS
authors.lastname: Yi