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US 2018/0006257 A1Published application
Carbon dot multicolor phosphors
AssigneeBoard of Supervisors of Louisiana State University and Agricultural and Mechanical College
InventorWeiyong YU
Life of this patent
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Abstract
Carbon dots synthesized from p-phenylenediamine in diphenyl ether exhibit excitation wavelength independent long wavelength multicolor emissions (green to red) when they are dispersed in different solvents and polymers. The emissions are excitation wavelength independent and one excitation light can excite all the colors.
Claims20
An electroluminescent light emitting diode (LED) device comprising:
- a hole transport layer;
- an electron transport layer;
- an active emissive layer between the hole transport layer and the electron transport layer;
- and
- the active emissive layer being formed with carbon dots.
2 more elements
A method of producing light comprising:
- supplying a current of electricity to an electroluminescent light emitting diode (LED);
- wherein the electroluminescent LED device comprises a hole transport layer, an electron transport layer, an active layer between the hole transport layer and the electron transport layer, and carbon dots form the active layer.
A method of forming an electroluminescent light emitting diode (LED) device comprising the steps of:
- treating a transparent conducting film with UV-ozone;
- depositing a hole injection layer on the treated transparent conducting film;
- annealing the hole injection layer in an oven at 120° C. for 10 min in air;
- spin casting a hole transport layer on the hole injection layer;
- curing the hole transport layer at 150° C. for 30 min;
- spin coating a carbon dot (CD)-active emissive layer over a surface of the hole transport layer;
- baking the CD active emissive layer at 80° C. for 30 min;
- thermally depositing an electron transport layer over the CD-active emissive layer;
- and
- one of
- thermally evaporating a LiF/AI bilayer cathode through a shadow mask and
- spin coating a ZnO nanoparticle electron transport layer over the CD-emissive layer, and the thermally evaporating an Al cathode through a shadow mask.
9 more elements
Dependencies are inferred from the claim text.