NDLI: Optical properties of Dy$^{3+}$ and Eu$^{3+}$ -Codoped SrWO$_{4}$ phosphors for white light-emitting diodes

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Optical properties of Dy$^{3+}$ and Eu$^{3+}$ -Codoped SrWO$_{4}$ phosphors for white light-emitting diodes

Content Provider	Springer Nature Link
Author	Cho, Shinho
Copyright Year	2018
Abstract	Dy$^{3+}$ - and Eu$^{3+}$ -codoped SrWO$_{4}$ phosphor powders were prepared using a solid-state reaction technique by changing the molar concentration of Eu$^{3+}$ within the range of 0 to 15 mol% at a fixed Dy$^{3+}$ concentration of 5 mol%. The effects of Dy$^{3+}$ and Eu$^{3+}$ doping on the structural, morphological, and optical properties of SrWO4:Dy$^{3+}$, Eu$^{3+}$ phosphors were investigated via Xray diffraction, scanning electron microscopy, and photoluminescence spectrophotometry, respectively. Irrespective of the concentrations of Dy$^{3+}$ and Eu$^{3+}$ ions, the crystal structures of all the phosphors were tetragonal, and the grains exhibited a tendency to agglomerate. The emission spectra of Sr0.925WO4:5 mol% Dy$^{3+}$ contained an intense yellow band at 573 nm arising from the 4F $_{9/2}$ → 6H $_{13/2}$ electric dipole transition of Dy$^{3+}$, as well as three weak emission lines. When the Eu$^{3+}$ ions were incorporated into the SrWO4:Dy$^{3+}$ phosphors, a strong red emission peak at 615 nm originating from the 5D0 → 7F2 transition of Eu$^{3+}$ appeared in addition to the four emission bands centered at 481, 573, 662, and 750 nm, which result from the 4f-4f transitions of Dy$^{3+}$. The emission intensity decreased as the Eu$^{3+}$ concentration increased up to 15 mol% due to concentration quenching, which resulted from dipole-dipole interactions. The results suggest that the color emissions and intensities of SrWO$_{4}$:Dy$^{3+}$, Eu$^{3+}$ phosphors can be tuned from yellow to white to red by varying the types of ions used and the ratio of Dy$^{3+}$ to Eu$^{3+}$ ions.
Starting Page	300
Ending Page	305
Page Count	6
File Format	PDF
ISSN	03744884
Journal	Journal of the Korean Physical Society
Volume Number	72
Issue Number	2
e-ISSN	19768524
Language	English
Publisher	The Korean Physical Society
Publisher Date	2018-01-27
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Theoretical, Mathematical and Computational Physics Photoluminescence Excitation Phosphor Physics Particle and Nuclear Physics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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