| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Hydrothermal Synthesis and Vacuum Ultraviolet-Excited Luminescence Properties of Novel Dy3+-doped GdPO4 White Light Phosphors |
| HAN Guo-Cai1, WANG Yu-Hua1,2, WU Chun-Fang1, ZHANG Jia-Chi1, LU Yang-Hua3 |
| 1Department of Material Science, School of Physical Science and Technology, Lanzhou University, Lanzhou 7300002Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 7300003Shenzhen Star Optoelectronic Technology Co., Ltd, Shenzhen 518100 |
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| Cite this article: |
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HAN Guo-Cai, WANG Yu-Hua, WU Chun-Fang et al 2009 Chin. Phys. Lett. 26 067803 |
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Abstract Novel Dy3+-doped GdPO4 white light phosphors with a monoclinic system are successfully synthesized by the hydrothermal method at 240°C. The strong absorption at around 147nm in the excitation spectrum is assigned to the host absorption. It is suggested that the vacuum ultraviolet excited energy is transferred from the host to the Dy3+ ions. The f-d transition of the Dy3+ ion is observed to be located at 182nm, which is consistent with the calculated value using Dorenbos's expression. Under 147nm excitation, Gd0.92PO4:0.08Dy3+ phosphor exhibits two emission bands located at 572nm (yellow) and 478nm (blue), which correspond to the hypersensitive transitions 4F9/2-6H13/2 and 4F9/2-6H15/2. The two emission bands lead to the white light. Because of the strong absorption at about 147nm, Gd0.92PO4:0.08Dy3+ under vacuum ultraviolet excitation is an effective white light phosphor, and has promising applications to mercury-free lamps.
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| Keywords:
78.55.-m
78.66.-w
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Received: 04 January 2009
Published: 01 June 2009
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| PACS: |
78.55.-m
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(Photoluminescence, properties and materials)
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78.66.-w
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(Optical properties of specific thin films)
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