White light emission and energy transfer in Dy{sup 3+}/Eu{sup 3+} co-doped BaLa{sub 2}WO{sub 7} phosphors

Journal Article · Mon Sep 15 04:00:00 EDT 2014 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2014.05.035· OSTI ID:22420548

Deng, Yaomin; Yi, Shuangping; Huang, Jun; Xian, Jieqiang; Zhao, Weiren

Highlights: • BaLa{sub 2}WO{sub 7}:Dy{sup 3+}, Eu{sup 3+} phosphors were synthesized by solid-state reaction. • Eu{sup 3+} compensated the red emission component of the BaLa{sub 2}WO{sub 7}:Dy{sup 3+} phosphor. • The observed emission lifetimes indicates the energy transfer from Dy{sup 3+} to Eu{sup 3+}. • BaLa{sub 2}WO{sub 7}:Dy{sup 3+}, Eu{sup 3+} are potential phosphors used in n-UV pumped white LEDs. - Abstract: Tunable full color emissive BaLa{sub 1.75−x}WO{sub 7}:0.25Dy{sup 3+}, xEu{sup 3+} phosphors which peaked at 484 nm (blue), 572 nm (yellow), 593 nm (orange), and 617 nm (red) were synthesized by the traditional solid-state reaction method. The as-synthesized phosphors were characterized by X-ray power diffraction, diffused reflectance spectra, photoluminescence decay curves, photoluminescence excitation and emission spectra. The photoluminescence excitation spectra range from 200 to 500 nm, including an O{sup 2−}⟶W{sup 6+} charge transfer band and several 4f–4f transition peaks of Dy{sup 3+} and Eu{sup 3+}. Co-doping with Eu{sup 3+} compensated the red emission component of the BaLa{sub 2}WO{sub 7}:Dy{sup 3+} phosphor. Furthermore, the energy transfer from Dy{sup 3+} to Eu{sup 3+} was confirmed based on the luminescence spectra and decay curves. The intense white light emissions are suggestive exploration for the potential phosphor for optical materials applications used in the ultraviolet excited white light emitting diodes.

• OSTI ID: 22420548
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 57; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM COMPOUNDS
DOPED MATERIALS
DYSPROSIUM IONS
EMISSION SPECTRA
ENERGY TRANSFER
EUROPIUM IONS
EXCITATION
LANTHANUM TUNGSTATES
LIFETIME
LIGHT EMITTING DIODES
PHOSPHORS
PHOTOLUMINESCENCE
SOLIDS
ULTRAVIOLET RADIATION
VISIBLE RADIATION