Highly efficiently luminescent electroluminescent device

Abstract

The invention provides a highly-efficiently luminescent electroluminescent device. The highly-efficiently luminescent electroluminescent device comprises a transparent base, an intensifier structure and an LED (Light Emitting Diode) unit, wherein the LED unit comprises a transparent electrode, a light emitting component with at least one light emitting layer and a reflecting electrode layer; and the intensifier structure comprises a light scattering layer with a layer of high-refractive-index particles, a surface smoothing layer with high refractive index and a protecting layer, the surface smoothing layer comprises two elements as follows: one element is a high-refractive-index inorganic nanometer particle coated with a small organic molecule, and the other element is a polymerizable monomer or a macromolecular polymer. The highly-efficiently luminescent electroluminescent device disclosed by the invention has the following advantages of: (1) improving light output efficiency; and (2) reducing production cost.

Description

technical field [0001] The invention relates to an electroluminescent device, in particular to an electroluminescent device capable of improving luminous efficiency. Background technique [0002] Electroluminescent devices (LEDs) mainly include the following types: organic electroluminescent devices (OLEDs), polymer electroluminescent devices (PLEDs) and inorganic electroluminescent devices, such as QD-LEDs. [0003] Existing LEDs usually include a transparent substrate, a transparent first electrode layer, a light emitting element and a reflective second electrode layer. When electrons and holes are injected from two electrons through the light-emitting element into the LED, they combine or collide together to generate light. The light-emitting element usually includes several layers of materials, including at least one light-emitting layer for emitting light. A light emitting element of an OLED generally includes an electron injection layer, an electron transport layer, o...

AI Technical Summary

Problems solved by technology

[0007] In most cases, these light-enhancing structures are placed on the outer surface of the transparent substrate. Since organic light can never reach these structures, these light-enhancing structures can only use air light and substrate light.

Since organic light accounts for half of the emitted light, these light-enhancing structures cannot effectively increase the output of light. In order to effectively extract these three kinds of light, the light-enhancing structure must be located near the transparent electrode. The bottom emission structure in the existing invention, Setting the light-enhancing structure close to the electrode layer means that the light-enhancing structure must be placed between the transparent electrode and the substrate in the LED. Designing this internal light-enhancing structure means complex technical challenges, because unless the perfection of the thin-film LED can be guaranteed, the light-enhancing structure will Located inside an LED can cause many undesirable consequences including dead shorting of the device

Although there are many proposals for internal light-enhancing structures, such devices that produce better luminous efficiency have not been achieved in the actual prior art

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