of a liquid crystal display or a back light of a fluorescent display lamp in embodiment 1 an example of a case of using an organic film as a substitute for the clusters of organic substances 311 and 312 shown in fig3 b will be illustrated in fig4 it is to be noted that the structure of the light emitting device is similar to that of fig3 a embodiment 1 is characterized in the structure such that an organic film 401 that has the effect of reducing the lumo level is provided in order to form an election trap region or an organic film 402 that has the effect of raising the homo level is provided in order to form a hole trap region both the organic films 401 and 402 may be provided or either one may be provided further the film thickness of the organic films 401 and 402 may be formed to between 10 and 50 nm preferably between 20 and 30 nm in the case of adopting the structure of embodiment 1 the hole is trapped in the organic film 401 and the electron is trapped in the organic film 402 whereby the re coupling efficiency can be improved and the driving voltage of the el elements can be reduced in other words a highly reliable light emitting.