科研之友
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摘要
Based on the layer-optimized method, the devices of sandwiched structure are produced by compounding MEH-PPV and SiO2. In three different voltage regions of afternating current, the devices luminesce differently. When the voltage is low, red emission is obtained; and if the voltage is high, blue emission is acquired. The superposition of the above two emissions is obtained when the voltage is moderate. The red or blue emission belongs to the solid-state cathodoluminescence, it originates from the accelerated electrons in SiO2 I which bombard the organic layers. By the study on the optic characteristics of the devices, the scopes and regulations of spectra shift are analyzed.
