Cathodoluminescence of Single Phase ZnAl{sub}2O{sub}4 and Diffusion Layer Synthesized by Coupling of ZnO and α-Al{sub}2O{sub}3

摘要

Zinc oxide (ZnO) ceramics was coupled and reacted with alpha aluminum oxide (α-Al{sub}2O{sub}3) ceramics at 1200°C for 24 h. SEM observation and energy dispersive X-ray spectroscopy (EDS) analysis revealed the existence of diffusion layer of 10μm thickness on the α-Al{sub}2O{sub}3 side of interface between ZnO and α-Al{sub}2O{sub}3. The diffusion layer is considered to consist of a ZnAl{sub}2O{sub}4, from the result of XRD. The cathodoluminescence of the diffusion layer was compared with that of zinc aluminate (ZnAl{sub}2O{sub}4) ceramics synthesized by conventional solid state reaction method. The single phase ZnAl{sub}2O{sub}4 showed weak emission peaked at 4.6 eV. On the other hand, the diffusion layer showed intense emission peaked at 3.75 eV. The ZnAl{sub}2O{sub}4 on the α-Al{sub}2O{sub}3 side of the interface synthesized by coupling of ZnO and α-Al{sub}2O{sub}3 is considered to be a excellent material as an ultraviolet light emitter.