Investigation of Luminescence Mechanism of Hybrid MEH-PPV/ SiO2 and Super Liner Characteristic of Amorphous SiO2
QU Chong1, XU Zheng2, CHEN Yue-ning2
1. School of Physics and Electronic Engineering，Ludong University，Yantai 264025, China 2. Institute of Optoelectronic Technology，Beijing Jiaotong University，Beijing 100044, China
Abstract：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 SiO2 as acceleration, multiplication and ionization, the solid-state cathodoluminescence was realized. The obvious feature of electroluminescence in the luminescence device with ITO/SiO2/MEH-PPV/SiO2/Al is that it has two spectral bands. In the electroluminescence spectra, the authors obtained both blue emission(403 nm)and excition luminescence(583 nm)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 short wave 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 SiO2 in the higher electric field and the influences of thickness on it were studied.
Key words：Heterojunction;Hot electrons;Solid-state cathodoluminescence;Super liner characteristic of SiO2
