For electricity induced luminescence of thin film, the heterojunction luminescence devices were produced by compounding the organic polymer of MEH-PPV and inorganic semiconductor SiO₂. Utilizing the super liner characteristic of SiO₂as acceleration, multiplication and ionization, the solid-state cathodoluminescence was real-ized. The obvious feature of electroluminescence in the luminescence device withITO/SiO₂/MEH-PPV/SiO₂/Al is that it has two spectral bands. In the electroluminescence spectra, the authors obtained both blue emission(403nm)and excition luminescence(583nm)of MEH-PPV and the intensity of the long and short wave peak changing with the voltage. Only long wave peak is observed when the voltage is low and only shor twave peak appears when the voltage is high. It is the typical feature that the solid-state cathodoluminescence has two spectral bands. It is a new light emission, which has new mechanism and is important for the luminescence. One of the important aspects of the solid state cathodoluminescence theory is the super liner characteristic of SiO₂. In the present paper, the luminescence dynamics of solid-state cathodoluminescence, the super liner characteristic of SiO₂in the higher electric field and the influences of thickness on it were studied.