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Colour Tuning of Single Host Phosphors for White Light by Al Addition |
| WANG Da-Jian;WANG Ji-Lei;LI Lan |
| Institute of Materials Physics, Tianjin University of Technology, Tianjin 300191
Tianjin Key Laboratory for Photoelectric Materials and Devices, Tianjin 300191 |
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| Cite this article: |
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WANG Da-Jian, WANG Ji-Lei, LI Lan 2006 Chin. Phys. Lett. 23 2247-2250 |
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Abstract We report a newly found strong disturbing effect of Al addition to the intensity ratios of blue and green emissions from single host full-colour phosphor of Ba-3MgSi2-xAlxO8:0.02Eu2+, 0.1Mn2+ for near-UV excited white light. The phase-pure silicate phosphor in the size of around 4μm is prepared by salt-assisted spray pyrolysis route, having three-colour emissions at the wavelength peak values of 437nm, 500nm and 608nm simultaneously under the excitation of 375nm. The amount variation of Al ion added to the phosphor host results in a drastic change of the intensity ratio between green and blue emissions, while the intensity of red light keeps unchanged. As a consequence, the combination of three colours lies in the white light region and can be tuned by precisely controlled addition of Al content. The Raman spectroscopy verifies the modifying effect of Al ion to the tetrahedral network in silicate hosts. We assume that by addition of Al ion, the amount of those two kinds of Eu2+ substituting for those two kinds of Ba2+ lattice sites with distinct energy levels of blue and green featured emissions can be adjusted to contribute to diversification of the ratios of blue and green emissions.
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| Keywords:
78.55.-m
78.30.-j
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Published: 01 August 2006
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| PACS: |
78.55.-m
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(Photoluminescence, properties and materials)
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78.30.-j
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(Infrared and Raman spectra)
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