ORGANIC ELECTROLUMINESCENCE ELEMENT AND ORGANIC ELECTROLUMINESCENCE DISPLAY

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.