ORGANIC ELECTROLUMINESCENT MATERIALS AND DEVICES
First Claim
Patent Images
1. A composition comprising:
- a mixture of a first compound and a second compound;
wherein the first compound has a different chemical structure than the second compound;
wherein the first compound is capable of functioning as a phosphorescent emitter in an organic light emitting device at room temperature;
wherein the first compound has an evaporation temperature T1 of 150 to 350°
C.;
wherein the second compound has an evaporation temperature T2 of 150 to 350°
C.;
wherein absolute value of T1-T2 is less than 20°
C.;
wherein the first compound has a concentration C1 in said mixture and a concentration C2 in a film formed by evaporating the mixture in a vacuum deposition tool at a constant pressure between 1×
10−
6 Torr to 1×
10−
9 Torr, at a 2 Å
/sec deposition rate on a surface position at a predefined distance away from the mixture being evaporated; and
wherein absolute value of (C1−
C2)/C1 is less than 5%.
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Abstract
A composition formed of a mixture of two compounds having similar thermal evaporation properties that are pre-mixed into an evaporation source that can be used to co-evaporate the two compounds into an emission layer in OLEDs via vacuum thermal evaporation process is disclosed.
30 Citations
78 Claims
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1. A composition comprising:
- a mixture of a first compound and a second compound;
wherein the first compound has a different chemical structure than the second compound; wherein the first compound is capable of functioning as a phosphorescent emitter in an organic light emitting device at room temperature; wherein the first compound has an evaporation temperature T1 of 150 to 350°
C.;wherein the second compound has an evaporation temperature T2 of 150 to 350°
C.;wherein absolute value of T1-T2 is less than 20°
C.;wherein the first compound has a concentration C1 in said mixture and a concentration C2 in a film formed by evaporating the mixture in a vacuum deposition tool at a constant pressure between 1×
10−
6 Torr to 1×
10−
9 Torr, at a 2 Å
/sec deposition rate on a surface position at a predefined distance away from the mixture being evaporated; andwherein absolute value of (C1−
C2)/C1 is less than 5%. - View Dependent Claims (4, 5, 8, 9, 10, 13, 14, 21, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 54)
- a mixture of a first compound and a second compound;
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2-3. -3. (canceled)
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6-7. -7. (canceled)
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11-12. -12. (canceled)
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15-20. -20. (canceled)
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22-27. -27. (canceled)
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49-53. -53. (canceled)
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55-63. -63. (canceled)
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64. A first device comprising a first organic light emitting device, the first organic light emitting device comprising:
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an anode; a cathode; and an organic layer, disposed between the anode and the cathode, comprising a first composition comprising a mixture of a first compound and a second compound, wherein the first compound has different chemical structure than the second compound; wherein the first compound is capable of functioning as a phosphorescent emitter in an organic light emitting device at room temperature; wherein the first compound has evaporation temperature of T1 150 to 350°
C.;wherein the second compound has evaporation temperature of T2 150 to 350°
C.;wherein the absolute value of T1-T2 is less than 20°
C.;wherein the first compound has a concentration C1 in said mixture, and a concentration C2 in a film formed by evaporating the mixture in a vacuum deposition tool at a constant pressure between 1×
10−
6 Torr to 1−
10−
9 Torr, at a 2 Å
/sec deposition rate on a surface positioned at a predefined distance away from the mixture being evaporated; andwherein absolute value of (C1−
C2)/C1 is less than 5%.
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65-77. -77. (canceled)
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78. A method for fabricating an organic light emitting device comprising a first electrode, a second electrode, and a first organic layer disposed between the first electrode and the second electrode, wherein the first organic layer comprises a first composition comprising a mixture of a first compound and a second compound, the method comprising:
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providing a substrate having the first electrode disposed thereon; depositing the first composition over the first electrode; and depositing the second electrode over the first organic layer, wherein the first compound has different chemical structure than the second compound; wherein the first compound is capable of functioning as a phosphorescent emitter in an organic light emitting device at room temperature; wherein the first compound has an evaporation temperature T1 of 150 to 350°
C.;wherein the second compound has an evaporation temperature T2 of 150 to 350°
C.;wherein absolute value of T1-T2 is less than 20°
C.;wherein the first compound has a concentration C1 in said mixture, and a concentration C2 in a film formed by evaporating the mixture in a vacuum deposition tool at a constant pressure between 1×
10−
6 Torr to 1×
10−
9 Torr, at a 2 Å
/sec deposition rate on a surface positioned at a predefined distance away from the material; andwherein absolute value of (C1−
C2)/C1 is less than 5%.
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Specification