Patent ID: 9748509
Date: 2017-08-29
CPC Classifications: H01L

Claim:
1. An organic electroluminescence (EL) element comprising: an anode; a cathode; an organic light-emitting layer between the anode and the cathode; an electron transport layer between the cathode and the organic light-emitting layer; and a sealing layer on an opposite side of the cathode from the electron transport layer, wherein the electron transport layer comprises an n-type dopant that comprises an electron-donating substance, a normal region of the electron transport layer being doped with the n-type dopant at a doping concentration that is higher than a doping concentration at which light emittance efficiency of the organic light-emitting layer is greatest, a crack is in the sealing layer, and the electron transport layer has a graduated region in which the doping concentration of the n-type dopant gradually decreases, a lowest doping concentration in the graduated region being closest to the crack.