From the viewpoint of application

electroluminescence (EL) is especially useful in the technology of flat panel display (FPD).Among the all types of emissive FPDs

inorganic electroluminescence (IEL) and organic electroluminescence (OEL) are especially promising’because of their several attractive characteristics.But there are still some deficiencies in their behavior.The main problem is the lack of blue colored emission in inorganic EL and the lack of electron transport materials and stability in organic EL.In view of the compensatory properties of IEL and OEL

it is quite natural to develop their superiority and minimize their inferiority.From this analysis

we are convinced that the heterogeneous junction made from organic and inorganic materials as well as the excitation with AC and DC sources may shed light on the possibility of combining their advantages.In the improvement of inorganic EL layered optimization has been proposed and investigated in detail.The aim of that structure is to strengthen the effect of electron acceleration by spatially separated addition of SiC

>

2 electron acceleration layer to the ordinary IEL layer.The semi-conducting property of the thin film of SiO

2

is used for electron acceleration.After acceleration the energy of electrons may be raised up to more than 10 electron volts.These hot electrons have enough energy to excite centers of luminescence in the visible region by impact excitation.Since these energetic electrons are accelerated not in vacuum but in solids

the luminescence generated by their bombardment is called Solid State Cathodolumi-nescence or CL-like emission.This CL-like emission is a new form of excitation mode.In this paper

we introduce and summarize the physical background

experimental results and some important unsolved problems about this method.At the end we propose some methods to solve these problems.