Organic light emitting device

摘要

Provided is an organic light emitting device that has high efficiency and high durability against continuous driving. The organic light emitting device includes an anode, a cathode, and organic compound layers placed between the anode and the cathode, in which the organic compound layers include a hole transport layer and an emitting layer, the hole transport layer and the emitting layer are in contact with each other, the hole transport layer has an arylamine compound and an aromatic hydrocarbon compound, and the emitting layer has a host and an electron trap dopant.

主权项

1. An organic light emitting device comprising:
an anode; a cathode; and organic compound layers placed between the anode and the cathode, wherein the organic compound layers include at least a hole transport layer and an emitting layer, the hole transport layer and the emitting layer being in contact with each other; wherein the hole transport layer has an arylamine compound and an aromatic hydrocarbon compound; wherein the aromatic hydrocarbon compound may have an alkyl group and the aromatic hydrocarbon compound satisfies the following requirements (i) and (ii): (i) the compound comprises a compound constituted only of carbon atom and hydrogen atom, and (ii) the compound has a partial structure represented by one of the following general formulae (ii-1) and (ii-2): wherein the emitting layer has a host and an electron trap dopant; and wherein the host and the electron trap dopant satisfy the following expressions (A) and (B):
|ELUMO(Dopant)|−|ELUMO(Host)|>0.15 eV  (A)|EHOMO(Host)|<|EHOMO(Dopant)|  (B) where, in the expressions (A) and (B), ELUMO(Dopant) represents a LUMO energy of the electron trap dopant, ELUMO(Host) represents a LUMO energy of the host, EHOMO(Host) represents a HOMO energy of the host, and EHOMO(Dopant) represents a HOMO energy of the electron trap dopant.