| Abstrakt: |
The Dy3+, Eu3+, and Sm3+-activated Sr2Al2B2O8 phosphor is prepared by a traditional combustion method, adding urea as a fuel. The photoluminescence properties and color chromaticity coordinate of synthesized Sr2Al2B2O8: RE (RE = Dy3+, Eu3+, Sm3+) phosphors are studied. The photoluminescence emission spectra of prepared Sr2Al2B2O8: Dy3+ phosphor reveal a strong emission peak lines centered at 484 nm and 577 nm in the blue and yellow regions, attributed to 4F9/2 → 6HJ (J = 15/2 and 13/2) of Dy3+ ions transition. The strongest emission peak is located at 484 nm under the excitation wavelength at 349 nm. The Sr2Al2B2O8:Eu3+ phosphor material exhibits the characteristic emission peaks located at 594 nm and 615 nm under the excitation wavelength at 393 nm, which corresponds to the transition of Eu3+ ions 5D0 → 7F1 and 7F2. The PL emission spectra of Sm3+-activated Sr2Al2B2O8 phosphor material consist of three strong peaks centered at 566 nm, 602 nm, and 648 nm under 404 nm excitation wavelength, which corresponds to transition 4G5/2 → 6HJ (J = 5/2, 7/2, and 9/2) at ground levels of Sm3+ ions with the emission of yellow, orange, and red colors. The maximum doping concentration of Sr2Al2B2O8: Dy3+, Sr2Al2B2O8: Eu3+, and Sr2Al2B2O8: Sm3+ phosphors is found to be 0.7 mol%. The prepared phosphor material shows blue, yellow, orange, and red color emission with color coordinate and high color purity. These results indicate that the Dy3+, Eu3+, and Sm3+-activated Sr2Al2B2O8 phosphor is a promising candidate of blue-yellow and orange-red-emitting materials for solid-state lightning devices, mainly WLED's. [ABSTRACT FROM AUTHOR] |
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