| 主权项 |
1. Organic electroluminescent device having an emission maximum of ≦570 nm comprising, in this sequence, an anode, an electron-blocking layer (EBL), a phosphorescent emission layer (EML) which comprises at least one phosphorescent compound and at least one matrix material, where the total concentration of all phosphorescent compounds is <10% by vol., a hole-blocking layer (HBL) and a cathode, where the electroluminescent device comprises no aluminium metal complex between the emitting layer and the cathode, characterised in that the following applies to the layers:
a) HOMO(EBL)−HOMO(EML)≦0.4 eV; b) LUMO(EML)−LUMO(HBL)≦0.4 eV; c) HOMO of all matrix materials of the EML≧−6.0 eV; and d) LUMO(EML)≦−2.5 eV;where HOMO(EBL) represents the HOMO of the material of the electron-blocking layer, HOMO(EML) represents the HOMO of the matrix material of the emission layer, LUMO(EML) represents the LUMO of the matrix material of the emission layer and LUMO(HBL) represents the LUMO of the material of the hole-blocking layer;wherein the HOMO and LUMO values are determined via quantum chemical calculations by performing energy calculations to arrive at values for HOMO HEh or LUMO LEh based on optimised geometry, and calibrating HOMO and LUMO values by the calculations below:
HOMO(eV)=((HEh*27.212)−0.9899)/1.1206 LUMO(eV)=((LEh*27.212)−2.0041)/1.385. |
