ORGANIC ELECTROLUMINESCENT ELEMENT

摘要

An organic EL device includes a pair of electrodes and an organic compound layer between pair of electrodes. The organic compound layer includes an emitting layer including a first material, a second material and a third material, in which singlet energy EgS(H) of the first material, singlet energy EgS(H2) of the second material, and singlet energy EgS(D) of the third material satisfy a specific relationship.

主权项

1. An organic electroluminescence device, comprising:
a pair of electrodes, and an organic compound layer in-between the pair of electrodes, wherein the organic compound layer comprises an emitting layer comprising: a first material; a second material; and a third material, singlet energy EgS(H1) of the first material, singlet energy EgS(H2) of the second material, and singlet energy EgS(D) of the third material satisfy formulae (1) and (2) below, a difference ΔST(H1) between the singlet energy EgS(H1) of the first material and an energy gap Eg77K(H1) at 77K of the first material satisfies formula (3) below, the energy gap Eg77K(H1) at 77K of the first material and the energy gap Eg77K(D) at 77K of the third material satisfy formula (7) below, the third material is a fluorescent material:
EgS(H1)>EgS(D)  (1)EgS(H2)>EgS(D)  (2)ΔST(H1)=EgS(H1)−Eg77K(H1)<0.3[eV]  (3)Eg77K(H1)−Eg77K(D)>0.5[eV]  (7).