Compositions comprising quantum dots
View Patent ↗A composition is provided, including one or more quantum dots and at least one organic emitter. Further, a formulation including the composition, a use of the formulation and a device comprising the composition or formulation is provided.
1. An electroluminescent device comprising a light emitting layer consisting of one type of quantum dot and one type of organic emitter, wherein said organic emitter is a phosphorescent, non-conjugated polymeric compound that includes at least one unit comprising a host compound, and a metal complex, the metal selected from a transition, a rare earth, a lanthanide, or an actinide metal, and the concentration of the quantum dots in the composition is in a range from 0.1 to 20 wt %;
wherein the quantum dot is selected from the group consisting of CdSe, CdS, CdTe, ZnSe, ZnS, ZnTe, alloys thereof, combinations thereof, core/shell structures thereof, and core multi-shell layered structures thereof, with a trioctylphosphine oxide coating the surface of the quantum dot;
wherein the one organic emitter is a phosphorescent, non-conjugated polymer that includes a repeat unit selected from formula (77) or (78)
wherein X and Y are independently selected from H, F, an alkyl group with 1 to 40 carbon atoms, an alkenyl group with 2 to 40 carbon atoms, an alkynyl group with 2 to 40 carbon atoms, a substituted or unsubstituted aryl group with 6 to 40 carbon atoms, and a substituted or unsubstituted heteroaryl group, wherein the heteroaryl group has 5 to 25 ring members.
2. The electroluminescent device of claim 1 , wherein the metal is selected from the group consisting of Ir, Ru, Os, Eu, Au, Pt, Cu, Zn, Mo, W, Rh, Pd, and Ag.
3. The electroluminescent device of claim 1 , wherein the one quantum dot has an emission wavelength that is longer than the emission wavelength of said at least one organic emitter.
4. The electroluminescent device of claim 1 further comprising at least one organic functional material selected from a host material, hole transport material, hole injection material, hole blocking material, electron transport material, electron injection material, electron blocking material, and emitter material, wherein said at least one organic functional material is selected from the group consisting of small molecules, conjugated polymers, non-conjugated polymers, oligomers, and dendrimers.
5. The electroluminescent device of claim 1 , wherein said phosphorescent, non-conjugated polymeric compound includes at least one further organic functional group selected from a host material, hole transport material, hole injection material, electron transport material, and electron injection material.
6. The electroluminescent device of claim 1 , wherein said electroluminescent device is a light emitting diode comprising an anode, a cathode, and the light emitting layer, wherein the emitting layer is positioned between said anode and said cathode.
7. The electroluminescent device of claim 1 , wherein said electroluminescent device emits either white light or emits in at least one wavelength range chosen from the blue wavelength range, the green wavelength range, the red wavelength range, and the infrared wavelength range.
8. The device of claim 1 , wherein the non-conjugated polymer further includes a repeat unit selected from the group consisting of formulae (79) to (92)
wherein R 1 to R 4 are independently from each other selected from H, F, an alkyl group with 1 to 40 carbon atoms, an alkenyl group with 2 to 40 carbon atoms, an alkinyl group with 2 to 40 C-atoms, a substituted or unsubstituted aryl group with 6 to 40 carbon atoms, and a substituted or unsubstituted heteroaryl group, wherein the heteroaryl group has 5 to 25 ring members.