Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7223618 | Optik - International Journal for Light and Electron Optics | 2018 | 21 Pages |
Abstract
Bi4Si3O12:Eu3+ phosphors are synthesized by a solvothermal reaction method. The structural properties are investigated using the X-ray diffraction patterns, which confirmed the cubic phase with a space group I-43d. The optical properties are studied by the measurement of diffused reflectance, excitation and emission spectra. The photoluminescence (PL) excitation spectra of Bi4Si3O12:Eu3+ phosphor exhibits a broad band between 220 and 350â¯nm with two peaks occurring around 271 and 297â¯nm corresponding to the host absorption and charge transfer bands, respectively, and several sharp peaks due to the f-f transitions of Eu3+ ions in the wavelength over 350â¯nm. The PL spectra exhibit blue emission due to the 1S0â¯ââ¯3P1 transition of Bi3+ and red emission due to the 5D0â¯ââ¯7F2 transition of Eu3+. With increase of Eu3+ concentration, blue emission decreased and red emission increased. At the concentration of 3â¯mol% Eu3+, Bi4Si3O12:Eu3+ phosphors show white emission with the CIE chromaticity coordinates (xâ¯=â¯0.345, yâ¯=â¯0.327). These results suggest that the Bi4Si3O12:Eu3+ phosphors are promising luminescence materials for UV based white light emitting diodes.
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Authors
Jin Young Park, Sung Jun Park, Hyun Kyoung Yang,