Organic electroluminescent element
AssigneeFUJIFILM Corporation
InventorsFumito Nariyuki, Kazuki Yamazaki
Life of this patent
Estimating the term…
Abstract
An organic electroluminescent element including 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.
Claims19
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.
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 the plurality of host compounds include a hole transporting host and an electron transporting host;
- 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.
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,
- wherein the plurality of host compounds include a hole transporting host and an electron transporting host;
- the hole transporting host is selected from H-1, H-3, H-4, H-7or H-8 represented by thefollowing formulae;
- the electron transporting host is selected from E-1 or E-11 represented by the following formulae;
- and the luminescent dopant is selected from D-1 or D-3 represented by the following formulae
- 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.
Dependencies are inferred from the claim text.