Patent ID: 9705087
Date: 2017-07-11
CPC Classifications: C09K,G03G,H01L,H05B

Claim:
1. An organic light emitting device comprising: an anode; a cathode; and an organic compound layer being placed between the anode and the cathode and including at least a hole transport layer and an emission layer, wherein the emission layer contains a light emitting material which emits light including light in the blue color wavelength region; wherein the hole transport layer contains a first organic compound and a second organic compound; wherein an ionization potential of the second organic compound is smaller than that of the first organic compound; wherein the second organic compound in a radical cation state has no absorption spectrum peak in the blue color wavelength region; and wherein concentration of the second organic compound is 5% by weight or more to 30% by weight or less of the hole transport layer.