Optical and structural properties of nanosized ZnGa2O4:Cr phosphor |
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Authors: | Jong Su Kim Jin Su Kim Hong Lee Park |
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Institution: | Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, South Korea |
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Abstract: | Nanosized ZnGa2O4:Cr3+ powder is synthesized through hydrothermal method. The average particle size is 20 nm and they are spherical in shape. The excitation band from the charge transfer between Cr3+-O2− shows a blueshift behavior due to quantum confinement effect. X-ray diffraction pattern, Fourier transform-infrared spectrum, and electron paramagnetic resonance signal indicate that nanosized ZnGa2O4:Cr3+ phosphor shows many defect-related energy states and heavy lattice distortion in comparison with bulk ZnGa2O4:Cr3+ phosphor. Many defect states result in more nonradiative loss and shorter decay time. |
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Keywords: | 61 82 Rx 73 61 Tm 78 47 +p 78 55 &minus m |
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