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Optical Controlled Switch Behaviour of the ZnS:Cu and SrAl2O4:Eu Phosphors |
| WANG Shao-Min1;HU Lai-Gui1;ZHUO Jun1;ZENG Yue-Wu2 |
| 1Department of Physics, Zhejiang University, Hangzhou 310027
2The Center of Analysis and Measurement, Zhejiang University, Hangzhou 310028 |
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| Cite this article: |
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WANG Shao-Min, HU Lai-Gui, ZHUO Jun et al 2005 Chin. Phys. Lett. 22 2523-2525 |
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Abstract We study the effects of a laser beam from the laser diode operating at 980nm on the violet-excited ZnS:Cu and SrAl2O4:Eu phosphor powders. Two contrary phenomena, i.e., infrared-induced permanent quenching and short-lived enhancement of phosphorescence, are observed. The defect levels play a significant role in both the processes. It is demonstrated that the phosphorescence induced by the violet beam can be controlled by another infrared beam. The turn-off and turn-on behaviour means that doping luminescent centres into host materials is a considerable way to design a new all-optical switch and may control the output of laser beams in the fibre lasers and optical communications.
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| Keywords:
32.50.+d
33.50.-j
42.79.Ta
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Published: 01 October 2005
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| PACS: |
32.50.+d
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(Fluorescence, phosphorescence (including quenching))
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33.50.-j
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(Fluorescence and phosphorescence; radiationless transitions, quenching (intersystem crossing, internal conversion))
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42.79.Ta
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(Optical computers, logic elements, interconnects, switches; neural networks)
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