Patent ID: 9437833
Filing Date: 2016-09-06
CPC Classification: C07F,C09B,C09K,H01L

Claim Text:
1. An organic electroluminescent element comprising a light-emitting layer between an anode and a cathode, wherein the light-emitting layer comprises a phosphorescent light-emitting organic metal complex and at least one host compound; the host compound and the phosphorescent light-emitting organic metal complex have a difference of 0 to −0.5 in relative dielectric constant and have a difference of 0 to −5.5 debye in dipole moment; and the phosphorescent light-emitting organic metal complex is coordinated with a ligand having a partial structure represented by a general formula (1): where R ring A represents a 5- or 6-membered aromatic hydrocarbon ring or aromatic heterocycle; Ra and Rb each independently represent a hydrogen atom, a halogen atom, a cyano group, or an optionally substituted alkyl, alkenyl, alkynyl, alkoxy, amino, silyl, arylalkyl, aryl, heteroaryl, alicyclic, or heteroalicyclic group; na represents 1 or 2; and nb represents an integer of 1 to 4.