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Optical and structural properties of nanosized ZnGa2O4:Cr3+ phosphor

2004; Elsevier BV; Volume: 131; Issue: 12 Linguagem: Inglês

10.1016/j.ssc.2004.07.026

1879-2766

Jong Su Kim, Jin Su Kim, Hong Lee Park,

Microwave Dielectric Ceramics Synthesis

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.