Organic light emitting devices
View Patent ↗An organic electroluminescent device includes an anode, a cathode, and a light emitting zone including a material that at least one of reduces triplet/triplet interaction, reduces triplet/singlet interaction, and reduces singlet/singlet interaction.
1. An organic electroluminescent device comprising:
an anode,
a cathode, and
a light emitting zone between the anode and cathode having a blue emitting material and a triplet quenching material that is doped in the blue emitting material and quenches the triplet states of the blue emitting material without quenching the singlet states wherein the triplet quenching material reduces at least one of triplet/triplet interaction, and triplet/singlet interaction,
wherein the device is arranged such that recombination of electrons and holes in the light emitting zone occurs within a magnetic field.
2. The electroluminescent device of claim 1 , further comprising a material with strong spin orbit coupling properties.
3. The electroluminescent device of claim 1 , further comprising a material that has strong absorption properties for at least one of second triplet states and second singlet states.
4. The electroluminescent device of claim 1 , further comprising a material that increases the intermolecular distances between light emitting molecules.
5. The electroluminescent device of claim 1 , further comprising a material that includes at least one of
strong spin orbit properties,
strong absorption properties at second triplet states and second singlet states, and
properties of increasing the intermolecular distances between light emitting molecules.
6. The electroluminescent device of claim 2 , wherein the material with strong spin orbit coupling properties includes an organometallic compound.
7. An organic electroluminescent device comprising:
an anode,
a cathode, and
a light emitting zone between the anode and cathode having a blue emitting material and a triplet quenching material that is doped in the blue emitting material and quenches the triplet states of the blue emitting material without quenching the singlet states,
wherein the device is arranged such that recombination of electrons and holes in the light emitting region occurs within a magnetic field having a strength sufficient to reduce at least one of triplet/triplet interaction, triplet/singlet interaction, and singlet/singlet interaction.
8. The electroluminescent device of claim 7 , wherein the magnetic field is provided by a sheet magnet.
9. An organic electroluminescent device comprising:
an anode;
a cathode; and
a light emitting zone between the anode and cathode having a mixture of a blue emitting material and a wide band gap material,
wherein the wide band gap material increases the intermolecular distances between each molecule of the blue emitting material,
wherein the energy bad gap of the wide band gap material is about 2.7 eV or more,
wherein the wide band gap material reduces at least one of triplet/triplet interaction, triplet/singlet interaction and singlet/singlet interaction, and
wherein the device is arranged such that recombination of electrons and holes in the light emitting zone occurs within a magnetic field.
10. The electroluminescent device of claim 9 , wherein the wide band gap material is an organic material.
11. The electroluminescent device of claim 9 , wherein the wide band gap material is an inorganic material.