High performance organic electroluminescent(EL) devices which are composed of organic thin multilayer films are fabricated. The basic structure is hole-transport layer, emitting layer and electron transporting layer. The hole-transporting layer is an amorphous diamine film in which the only mobile carrier is the hole. The emitting layer is consisted of a host material(Alq3) and a guest emitting materials(Rhodamine 101 perchrolate(Red3)). The microscopic study on emitting layer was performed by confocal image system. In this study, we could good result with varing the thickness of emitting layer, 100Å of emitting layer will 3% of Red3 had a 2.3E+0.4(Alq3) and 1.65E(Red3) of EL at 11V, operating voltage.