Organic/polymeric electroluminescence (EL) has attracted much attention due to its potential applications in large-area full-color flat-panel displays. Since the first report of high performance double-layer organic light-emitting device by C.W. Tang in 1987

much progress has been made in this field. A lot of novel materials have been synthesized. So it becomes very important to characterize and evaluate the properties of these materials. Study on the energy band structure of organic/polymer materials is very significant. It can give directions in materials design and synthesis

devices design and fabrication

and device properties improvement. In this work

we focus on the characterization and analysis of the energy band structure of more than one hundred kinds of organic/polymer EL materials by cyclic voltammetry and UV-Vis spectra method. The materials include a series of π-conjugated rigid rod phenylene vinylene (PPV) oligomers

pyrazoline derivatives system

bipyridine ruthenium complexes system

rhenium complexes system and some other materials(including EL materials and carrier transporting materials) in common use. Based on the principle of energy level matching

a series of organic EL device were designed and fabricated. The result shows that a good performance device can be obtained by considering the energy band matching

the thickness matching

as well as the carrier mobility matching.