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US 11,641,753 B2Granted
Organic light-emitting device
AssigneeSamsung Electronics Co., Ltd.
InventorsSunghun Lee, Sangdong Kim, Seungyeon Kwak, Hyun Koo, Jungin Lee, Kyuyoung Hwang
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Abstract
An organic light-emitting device including a first electrode, a second electrode facing the first electrode, and an organic layer disposed between the first electrode and the second electrode, wherein the organic layer includes an emission layer, wherein the emission layer includes an electron transport host, a hole transport host, and a dopant, wherein the dopant includes an organometallic compound, and wherein the organometallic compound does not comprise iridium, wherein the organic light-emitting device satisfies predetermined parameters described in the specification.
Claims18
An organic light-emitting device comprising:
- a first electrode,
- a second electrode facing the first electrode, and
- an organic layer disposed between the first electrode and the second electrode,
- wherein the organic layer comprises an emission layer, and the emission layer comprises an electron transport host, a hole transport host, and a dopant,
- wherein the electron transport host comprises a triphenylene group and a triazine group, and the hole transport host comprises a carbazole group,
- the dopant comprises an organometallic compound, and the organometallic compound does not comprise iridium,
- the organic light-emitting device satisfies a condition of
- LUMO(dopant)−LUMO(host-E)≥0.15 eV and LUMO(host-E)−HOMO(host-H)>T1(dopant),
- wherein LUMO(dopant) indicates a lowest unoccupied molecular orbital (LUMO) energy level (expressed in electron volts) of the dopant in the emission layer,
- LUMO(host-E) indicates a LUMO energy level (expressed in electron volts) of the electron transport host in the emission layer,
- HOMO(host-H) indicates a highest occupied molecular orbital (HOMO) energy level (expressed in electron volts) of the hole transport host in the emission layer, and
- T1(dopant) indicates a triplet energy level (expressed in electron volts) of the dopant in the emission layer,
- LUMO(dopant), LUMO(host-E), and HOMO(host-H) each indicate a negative value measured by differential pulse voltammetry using ferrocene as a reference material, and
- T1(dopant) is a value calculated from a peak wavelength of a phosphorescence spectrum of the dopant measured using a luminescence measuring device.
11 more elements
An organic light-emitting device comprising:
- a first electrode,
- a second electrode facing the first electrode,
- light-emitting units in a number of m that are stacked between the first electrode and the second electrode, wherein the light-emitting units comprise at least one emission layer, and
- charge-generation layers in a number of m−1 that are disposed between two neighboring light-emitting units selected from the light-emitting units in the number of m, wherein the charge-generation layers include an n-type charge-generation layer and a p-type charge-generation layer,
- wherein m is an integer greater than or equal to 2,
- a maximum emission wavelength of light emitted by at least one of the light-emitting units in the number of m is different from a maximum emission wavelength of light emitted by at least one of the other light-emitting units,
- the emission layer comprises an electron transport host, a hole transport host, and a dopant,
- wherein the electron transport host comprises a triphenylene group and a triazine group, and the hole transport host comprises a carbazole group,
- the dopant comprises an organometallic compound, provided that the organometallic compound does not comprise iridium, and
- the organic light-emitting device satisfies a condition of
- LUMO(dopant)−LUMO(host-E)≥0.15 electron volts and LUMO(host-E)−HOMO(host-H)>T1(dopant),
- wherein LUMO(dopant) indicates a LUMO energy level (expressed in electron volts) of the dopant in the emission layer,
- LUMO(host-E) indicates a LUMO energy level (expressed in electron volts) of the electron transport host in the emission layer,
- HOMO(host-H) indicates a HOMO energy level (expressed in electron volts) of the hole transport host in the emission layer,
- T1(dopant) indicates a triplet energy level (expressed in electron volts) of the dopant in the emission layer,
- LUMO(dopant), LUMO(host-E), and HOMO(host-H) each indicate a negative value measured by differential pulse voltammetry using ferrocene as a reference material, and
- T1(dopant) indicates a value calculated from a peak wavelength of a phosphorescence spectrum of the dopant measured using a luminescence measuring device.
14 more elements
An organic light-emitting device comprising:
- a first electrode,
- a second electrode facing the first electrode, and
- light-emitting units in a number of m that are stacked between the first electrode and the second electrode,
- wherein m is an integer of greater than or equal to 2,
- a maximum emission wavelength of light emitted by at least one of the light-emitting units in the number of m is different from a maximum emission wavelength of light emitted by at least one of the other light-emitting units,
- the emission layer includes an electron transport host, a hole transport host, and a dopant,
- wherein the electron transport host comprises a triphenylene group and a triazine group, and the hole transport host comprises a carbazole group,
- the dopant includes an organometallic compound, provided that the organometallic compound does not include iridium, and
- the organic light-emitting device satisfies a condition of
- LUMO(dopant)−LUMO(host-E)≥0.15 electron volts and LUMO(host-E)−HOMO(host-H)>T1 (dopant),
- wherein LUMO(dopant) indicates a LUMO energy level (expressed in electron volts) of the dopant in the emission layer,
- LUMO(host-E) indicates a LUMO energy level (expressed in electron volts) of the electron transport host in the emission layer,
- HOMO(host-H) indicates a HOMO energy level (expressed in electron volts) of the hole transport host in the emission layer,
- T1(dopant) indicates a triplet energy level (expressed in electron volts) of the dopant in the emission layer,
- LUMO(dopant), LUMO(host-E), and HOMO(host-H) each indicate a negative value measured by differential pulse voltammetry using ferrocene as a reference material, and
- T1(dopant) indicates a value calculated from a peak wavelength of a phosphorescence spectrum of the dopant measured using a luminescence measuring device.
13 more elements
Dependencies are inferred from the claim text.