Patent ID: 7803468
Filing Date: 2010-09-28
Classification: C09K,H01L,H05B,Y10S

Abstract:
1. An organic electroluminescent element comprising: a pair of electrodes and one or more organic compound layers including at least one light-emitting layer disposed between the pair of electrodes, wherein the at least one light-emitting layer contains at least one luminescent dopant and a plurality of host compounds; the ionization potential of the dopant is Ip(D), the minimum value out of the ionization potentials of the plurality of host compounds is Ip(H)min, and ΔIp is defined by ΔIp=Ip(D)−Ip(H)min and satisfies a relationship of ΔIp>0 eV; the electron affinity of the dopant is Ea(D), the maximum value out of the electron affinities of the plurality of host compounds is Ea(H)max, and ΔEa is defined by ΔEa=Ea(H)max−Ea(D) and satisfies a relationship of ΔEa>0 eV; and wherein when the minimum value out of the minimum triplet excitation energies of the plurality of host compounds is T1(H)min, the minimum value satisfies a relationship of T1(H)min>T1(D), where T1(D) is the minimum triplet excitation energy of the dopant.