| 摘要 |
An organic electroluminescence device comprises a substrate, a first electrode layer, a hole transportation layer, a luminescence layer, an electron transportation layer and a second electrode layer. In addition, on the substrate is disposed the first electrode layer on which the hole transportation layer is further disposed. In addition, on the hole transportation layer is disposed the luminescence layer on which the electron transportation layer is further disposed, and eventually the second electrode layer is disposed on the electron transportation layer. Moreover, the electron transportation layer comprises n+1 first sub-transportation layers and n second sub-transportation layers, wherein n is an integer. The n+1 first sub-transportation layers are stacked on the luminescence layer, each of the n second sub-transportation layers is disposed between every two neighbor first sub-transportation layers and a band-gap of the first sub-transportation layer is different from that of second sub-transportation layer.
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