title: Energy transfer rate and electron-phonon coupling properties in Eu3+-doped nanophosphors.
abstract: A series of controllable emissions SrWO4:Eu3+and charge-compensated SrWO4: Eum3+ (m = 0.01 or 0.20) phosphors was successfully prepared via a simple co-precipitation method. The energy transfer mechanism was studied based on the Huang's theory. A low magnitude of Huang-Rhys factor (10-2) was calculated using phonon sideband spectra. The Judd-Ofelt parameters Ωλ(λ = 2, 4 and 6) of Eu3+-activated SrWO4doped with charge compensation were obtained. The calculated Commission Internationale de l'Eclairage chromaticity coordinates were found to be about (0.67, 0.33) for SrWO4: Eu0.203+ and charge-compensated SrWO4: Eu0.203+ phosphors, which coincided with the National Television Standard Committee system standard values for red. A white light emission was obtained under 362 nm excitation. The correlated color temperature was computed by a simple equation to characterize light sources. Thus, warm white light-emitting diodes with higher Ra can be constructed by combining as-prepared high efficiency, low correlated color temperature and high color purity phosphor.
authors.affiliation: School of Physics and Electrical Information Engineering, Daqing Normal University, Daqing, People's Republic of China.
authors.forename: Y D
authors.initials: YD
authors.lastname: Ren
authors.affiliation: School of Physics and Electrical Information Engineering, Daqing Normal University, Daqing, People's Republic of China.
authors.forename: Y H
authors.initials: YH
authors.lastname: Liu
authors.affiliation: School of Physics and Electrical Information Engineering, Daqing Normal University, Daqing, People's Republic of China.
authors.forename: S M
authors.initials: SM
authors.lastname: Tan
authors.affiliation: School of Physics and Electrical Information Engineering, Daqing Normal University, Daqing, People's Republic of China.
authors.forename: H Y
authors.initials: HY
authors.lastname: Cui
authors.affiliation: School of Physics and Electrical Information Engineering, Daqing Normal University, Daqing, People's Republic of China.
authors.forename: Y L
authors.initials: YL
authors.lastname: Wang
authors.affiliation: School of Physics and Electrical Information Engineering, Daqing Normal University, Daqing, People's Republic of China.
authors.forename: X M
authors.initials: XM
authors.lastname: Li
authors.affiliation: School of Physics and Electrical Information Engineering, Daqing Normal University, Daqing, People's Republic of China.
authors.forename: R
authors.initials: R
authors.lastname: Yang
authors.affiliation: School of Physics and Electrical Information Engineering, Daqing Normal University, Daqing, People's Republic of China.
authors.forename: X
authors.initials: X
authors.lastname: Wei
authors.affiliation: School of Physics and Electrical Information Engineering, Daqing Normal University, Daqing, People's Republic of China.
authors.forename: H W
authors.initials: HW
authors.lastname: Zhang
authors.affiliation: School of Physics and Electrical Information Engineering, Daqing Normal University, Daqing, People's Republic of China.
authors.forename: Y D
authors.initials: YD
authors.lastname: Sun
mesh_terms: D004583:Electrons; D004735:Energy Transfer; D005063:Europium / Q000737:chemistry*; D049449:Luminescence; D053758:Nanoparticles / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D060739:Phonons; D055668:Photochemical Processes; D013324:Strontium / Q000737:chemistry; D014414:Tungsten / Q000737:chemistry
chemical_list: D005063:Europium; D010100:Oxygen; D014414:Tungsten; D013324:Strontium
keywords: Huang-Rhys factor; Judd-Ofelt parameters; color purity; energy transfer phosphor; warm white LED