AC-DRIVEN LIGHT EMITTING DEVICE HAVING SINGLE ACTIVE LAYER STRUCTURE AND MANUFACTURING METHOD THEREOF
First Claim
1. An AC-driven light emitting device having a single active layer structure, the device comprising:
- a glass substrate;
a first electrode comprising a transparent electrode on the glass substrate;
an active layer of a single layer on the first electrode; and
a second electrode on the active layer,wherein the active layer has a p-i-n structure of a consolidated core-shell structure in which semiconductor nanocrystals are implanted on the surface of a polymer core comprising p-type polymer organic materials, and uniformly and isotropically distributed to surround the polymer core, and n-type small molecular organic materials surround the semiconductor nanocrystals and p-type polymer.
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Abstract
The present invention relates to an AC voltage-driven light emitting device having a single active layer of a core-shell structure (p-i-n structure) in which intrinsic semiconductor nanocrystals, exciton combination centers, are uniformly and isotropically distributed around p-type polymer particles, and n-type small molecular particles surround the semiconductor nanocrystals and p-type polymer, and a manufacturing method thereof. An active layer of a core-shell structure using a polymer-semiconductor nano hybrid in the light-emitting device has an inversion symmetry characteristic showing the same current-voltage characteristic during application of a voltage in a forward direction and a reverse direction. Therefore, due to this inversion symmetry characteristic, the light emitting can be driven by even an AC voltage. Also, since the device can be driven by an AC voltage, limitations of an existing DC voltage-driven organic light emitting diode, that is, destruction or a defect of the device by an overcurrent and generation of a dark spot by degradation of local constituent organic materials are solved.
23 Citations
15 Claims
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1. An AC-driven light emitting device having a single active layer structure, the device comprising:
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a glass substrate; a first electrode comprising a transparent electrode on the glass substrate; an active layer of a single layer on the first electrode; and a second electrode on the active layer, wherein the active layer has a p-i-n structure of a consolidated core-shell structure in which semiconductor nanocrystals are implanted on the surface of a polymer core comprising p-type polymer organic materials, and uniformly and isotropically distributed to surround the polymer core, and n-type small molecular organic materials surround the semiconductor nanocrystals and p-type polymer. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for manufacturing an AC-driven light emitting device having a single active layer structure, the method comprising:
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forming a first electrode using a transparent electrode on a glass substrate; adding p-type polymer organic materials, semiconductor nanocrystals, and n-type small molecular organic materials to a solvent to manufacture a mixed solution, and spin-coating the mixed solution on the first electrode/glass structure to form an active layer on the first electrode; and forming a second electrode on the active layer. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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Specification