Claims
- 1. An organic electroluminescent device comprising a light-emitting layer containing two or more organic compounds, wherein out of the organic compounds, two organic compounds are conditioned such that an energy level E1T1 of a first organic compound in a lowest excited triplet state is higher than an energy level E2S1 of a second organic compound in a lowest excited singlet state, at least one energy level of said second organic compound in an excited triplet state is present between E1T1 and E2S1, and light is emitted from the second organic compound.
- 2. An organic electroluminescent device comprising a light-emitting layer containing three or more organic compounds, wherein out of the organic compounds, three organic compounds are conditioned such that the energy level E1T1 of a first organic compound in a lowest excited triplet state is higher than an energy level E2S1 of a second organic compound in a lowest excited singlet state, at least one energy level of said second organic compound in a excited triplet state is present between E1T1 and E2S1, the energy level E1S1 in the lowest excited singlet state and the energy level E1T1 in the lowest triplet state of said first organic compound have the following relationship with an energy level E3S1 in a lowest excited singlet state and an energy level E3T1 in a lowest excited triplet state of a third organic compound:
E3S1>E1S1 E3T1>E1T1 and light is emitted from the second organic compound.
- 3. An organic electroluminescent device comprising an anode, a light-emitting layer described in claim 1 or 2 and a cathode in this order.
- 4. An organic electroluminescent device comprising an anode, a hole transport layer, a light-emitting layer described in claim 1 or 2, an electron transport layer and a cathode in this order.
- 5. The organic electroluminescent device as claimed in any one of claims 1 to 4, wherein the light emission from said second organic compound is fluorescence.
- 6. The organic electroluminescent device as claimed in any one of claims 1 to 5, wherein said first organic compound is a transition metal complex.
- 7. The organic electroluminescent device as claimed in any one of claims 1 to 5, wherein said first organic compound is a rare earth metal complex.
- 8. A light-emitting material comprising a light-emitting layer containing two or more organic compounds, wherein out of the organic compounds, two organic compounds are conditioned such that an energy level E1T1 of a first organic compound in a lowest excited triplet state is higher than an energy level E2S1 of a second organic compound in the lowest excited singlet state, at least one energy level of said second organic compound in an excited triplet state is present between E1T1 and E2S1, and light is emitted from the second organic compound.
- 9. A light-emitting material comprising a light-emitting layer containing three or more organic compounds, wherein out of the organic compounds, three organic compounds are conditioned such that an energy level E1T1 of a first organic compound in a lowest excited triplet state is higher than an energy level E2S1 of a second organic compound in a lowest excited singlet state, at least one energy level of said second organic compound in an excited triplet state is present between E1T1 and E2S1, the energy level E1S1 in the lowest excited singlet state and the energy level E1T1 in the lowest triplet state of said first organic compound have the following relationship with an energy level E3S1 in the lowest excited singlet state and an energy level E3T1 in the lowest excited triplet state of a third organic compound:
E3S1>E1S1 E3T1>E1T1 and light is emitted from the second organic compound.
- 10. The light-emitting material as claimed in claims 8 or 9, wherein the light emission from said second organic compound is fluorescence.
- 11. The light-emitting material as claimed in any one of claims 8 to 10, wherein said first organic compound is a transition metal complex.
- 12. The light-emitting material as claimed in any one of claims 8 to 10, wherein said first organic compound is a rare earth metal complex.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2000/149299 |
May 2000 |
JP |
|
CROSS REFERENCE TO THE RELATED APPLICATIONS
[0001] This is an application based on the prescription of 35 U.S.C. Section 111(a) with claiming the benefit of filing dates of U.S. Provisional applications Serial No. 60/221,486 filed Jun. 14, 2000 under the provision of 35 U.S.C.111(b), pursuant to 35 U.S.C. Section 119(e)(1).
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/JP01/04202 |
5/21/2001 |
WO |
|