Organic electroluminescent device

摘要

The present invention relates to phosphorescent organic electroluminescent devices include at least one phosphorescent emitter and a matrix material in the emitting layer, where certain conditions must be satisfied for the positions of the triplet energy and the HOMO and LUMO.

主权项

1. An organic electroluminescent device comprising anode, cathode and at least one emitting layer which comprises at least one phosphorescent compound A and at least one compound B, wherein the following relationships (1) or the following relationships (2) apply to compounds A and B:
T1(B)≧ΔE, where ΔE=|HOMO(A)|−|LUMO(B)|;  a) T1(A)≧ΔE, where ΔE=|HOMO(A)|−|LUMO(B)|;  b) |HOMO(B)|>|HOMO(A)|; and  c) |LUMO(B)|>|LUMO(A)|;  d) (1)or
T1(B)≧ΔE, where ΔE=|HOMO(B)|−|LUMO(A)|;  a) T1(A)≧ΔE, where ΔE=|HOMO(B)|−|LUMO(A)|;  b) |LUMO(A)|>|LUMO(B)|; and  c) |HOMO(A)|>|HOMO(B)|;  d) (2) where T1(A) or T1(B) each represents the lowest triplet energy in eV of compound A or B respectively; and where HOMO(A) or HOMO(B) each represents the energy level of the HOMO in eV relative to vacuum of compound A or B respectively; and where LUMO(A) or LUMO(B) each represents the energy level of the LUMO in eV relative to vacuum of compound A or B respectively; the following materials are excluded from the invention as compound B: