| 摘要 |
An organic EL element includes an anode, a positive hole injection layer, a first carrier transportation layer, a first light emitting layer, a second carrier transportation layer, a second light emitting layer, an electron transportation layer, and a cathode successively formed on a glass substrate. The first and the second carrier transportation layers have smaller electronic affinity Ea and a greater energy gap Eg than the first and the second light emitting layers, thereby improving the light emitting efficiency of the first and the second light emitting layers.
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