| 摘要 |
PURPOSE:To make it possible to improve light emission efficiency of the element in the caption by arranging the third insulating layers whose work function is lower than that of the first and the second insulating layers respectively between a light emission layer and the first or the second insulating layer respectively. CONSTITUTION:Each of the third or the fourth insulative layers 14 and 16 whose work functions are lower than those of the first and the second insulative layers 13 and 17 respectively is arranged between the first or the second insulative layer 13 or 17 and a light emission layer 15 respectively. By arranging an insulating layer with high electron emission-capability in this way, when a voltage is applied between a transparent electrode 12 and a back electrode 18, electrons are emitted not only from the light emission layer but also from this insulating layer with electron emission-capability. Accordingly, an amount of electron emission is, as a whole, increased so that electron collision probability to the light emission center and emission efficiency of the light emission layer can be improved.
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