| CPC H10K 85/6572 (2023.02) [H10K 85/622 (2023.02); H10K 85/626 (2023.02); H10K 85/633 (2023.02); H10K 85/636 (2023.02); H10K 85/654 (2023.02); H10K 50/11 (2023.02); H10K 50/13 (2023.02); H10K 85/615 (2023.02); H10K 85/624 (2023.02); H10K 2101/10 (2023.02); H10K 2101/90 (2023.02); H10K 2102/351 (2023.02)] | 15 Claims |
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1. An organic electroluminescence device, comprising:
an anode;
a cathode; and
a light-emission layer disposed between the anode and the cathode,
wherein the light-emission layer includes a stack of a blue light-emission layer, and a red/green light concurrent-emission sub-stack,
wherein the red/green light concurrent-emission sub-stack includes a stack of a red light-emission layer and a green light-emission layer,
wherein the green light-emission layer is disposed between the red light-emission layer and the cathode,
wherein the red light-emission layer contains a red host compound and a red phosphorescent dopant compound,
wherein the green light-emission layer contains a green host compound and a green phosphorescent dopant compound,
wherein a maximum emission wavelength band of the red phosphorescent dopant compound is in a range of 610 nm to 640 nm,
wherein a maximum emission wavelength band of the green phosphorescent dopant compound is in a range of 510 nm to 540 nm,
wherein the green host compound includes a mixture of a first green host compound and a second green host compound,
wherein a content ratio of the first green host compound to the second green host compound is 1:1,
wherein a thickness of the red light-emitting layer is in a range of 10 nm to 20 nm, wherein the green light-emitting layer has a thickness in a range of 20 nm to 40 nm,
wherein, in an electroluminescence spectrum of the device, a ratio of a maximum peak intensity in a red wavelength band to a maximum peak intensity in a green wavelength band is smaller than 1.8,
wherein the red phosphorescent dopant compound comprises at least one compound represented by Chemical Formula 4 or a compound represented by Chemical Formula 5,
wherein the green phosphorescent dopant includes at least one of a compound represented by Chemical Formula 6 or a compound represented by Chemical Formula 7:
 wherein, in the Chemical Formula 4, each of A1 and A2 independently represents one selected from the group consisting of hydrogen, deuterium, halogen, a substituted or unsubstituted C1 to C6 alkyl group, a substituted or unsubstituted C3 to C6 cycloalkyl group, a substituted or unsubstituted C6 to C10 aryl group, a substituted or unsubstituted C5 to C9 heteroaryl group, a substituted or unsubstituted carbazole group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenyl group, a substituted or unsubstituted trialkylsilyl group, and a substituted or unsubstituted triarylsilyl group,
wherein, in the Chemical Formula 4, s denotes an integer of 1 to 4, t denotes an integer from 1 to 6, and each of R11, R12, and R13 independently represents one selected from the group consisting of hydrogen, a substituted or unsubstituted C1 to C6 alkyl group, a substituted or unsubstituted C1 to C6 cycloalkyl group, and a substituted or unsubstituted C6 to C10 aryl group, wherein R11 and R12 are or R12 and R13 are connected to each other to form a ring,
 wherein, in the Chemical Formula 5, each of A3 and A4 independently represents one selected from the group consisting of hydrogen, deuterium, halogen, a substituted or unsubstituted C1 to C6 alkyl group, a substituted or unsubstituted C3 to C6 cycloalkyl group, a substituted or unsubstituted C6 to C10 aryl group, a substituted or unsubstituted C5 to C9 heteroaryl group, a substituted or unsubstituted carbazole group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenyl group, a substituted or unsubstituted trialkylsilyl group, and a substituted or unsubstituted triarylsilyl group,
wherein, in the Chemical Formula 5, u denotes an integer of 1 to 4, v denotes an integer from 1 to 6, and each of R14, R15, and R16 independently represents one selected from the group consisting of hydrogen, a substituted or unsubstituted C1 to C6 alkyl group, a substituted or unsubstituted C1 to C6 cycloalkyl group, and a substituted or unsubstituted C6 to C10 aryl group, wherein R14 and R15 are or R15 and R16 are connected to each other to form a ring,
 wherein, in the Chemical Formula 6, each of A5 and A6 independently represents one selected from the group consisting of hydrogen, deuterium, halogen, a substituted or unsubstituted C1 to C6 alkyl group, a substituted or unsubstituted C3 to C6 cycloalkyl group, a substituted or unsubstituted C6 to C10 aryl group, a substituted or unsubstituted C5 to C9 heteroaryl group, a substituted or unsubstituted carbazole group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenyl group, a substituted or unsubstituted trialkylsilyl group, and a substituted or unsubstituted triarylsilyl group,
wherein, in the Chemical Formula 6, each of w and x independently denotes an integer of 1 to 4, and each of R17, R18, and R19 independently represents one selected from the group consisting of hydrogen, a substituted or unsubstituted C1 to C6 alkyl group, a substituted or unsubstituted C1 to C6 cycloalkyl group, and a substituted or unsubstituted C6 to C10 aryl group, wherein R17 and R18 are or R18 and R19 are connected to each other to form a ring,
 wherein, in the Chemical Formula 7, each of A7 and A8 independently represents one selected from the group consisting of hydrogen, deuterium, halogen, a substituted or unsubstituted C1 to C6 alkyl group, a substituted or unsubstituted C3 to C6 cycloalkyl group, a substituted or unsubstituted C6 to C10 aryl group, a substituted or unsubstituted C5 to C9 heteroaryl group, a substituted or unsubstituted carbazole group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenyl group, a substituted or unsubstituted trialkylsilyl group, and a substituted or unsubstituted triarylsilyl group,
wherein, in the Chemical Formula 7, y denotes an integer of 1 to 4, z denotes an integer from 1 to 3, and each of R20, R21, and R22 independently represents one selected from the group consisting of hydrogen, a substituted or unsubstituted C1 to C6 alkyl group, a substituted or unsubstituted C1 to C6 cycloalkyl group, and a substituted or unsubstituted C6 to C10 aryl group, wherein R20 and R21 are or R21 and R22 are connected to each other to form a ring, and
wherein, in the Chemical Formula 7, each of Y1, Y2, Y3, and Y4 independently represents N or CR′, wherein R′ represents one selected from the group consisting of hydrogen, deuterium, halogen, a substituted or unsubstituted C1 to C6 alkyl group, a substituted or unsubstituted C3 to C6 cycloalkyl group, a substituted or unsubstituted C6 to C10 aryl group, and a substituted or unsubstituted C5 to C9 heteroaryl group,
wherein the red light-emission layer contains a red host compound represented by at least one of the following compounds:
  wherein the first green host compound is a compound represented by at least one of the following compounds:
            wherein the second green host compound is a compound represented by at least one of the following compounds:
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