OLED Array Substrate With Metal-Doped Planarization Layer
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Solution Overview
Problem
Existing OLEDs face challenges in achieving high light extraction efficiency due to energy loss during the light-emitting process and total reflection at interfaces, resulting in only about 20% of emitted light being emitted into the air, with current techniques like photonic crystals and microcavity structures having complex manufacturing processes and drawbacks such as chromatic aberration.
Innovation Solution
An array substrate with a planarization layer doped with metal micro/nanoparticles, such as gold, silver, or aluminum, which enhances light extraction efficiency by utilizing surface plasmon resonance effects to improve both inner and outer quantum efficiencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If photonic crystals or microcavity structures are used to improve light extraction efficiency, then light extraction efficiency is improved, but manufacturing complexity increases and chromatic aberration occurs
Solution Approach 1:
The patent changes the material parameter of the planarization layer by doping it with metal nanoparticles, transforming it from a conventional organic material to a composite material with plasmonic properties. This parameter change enables improved light extraction efficiency through surface plasmon resonance without requiring complex photonic crystal structures or microcavity designs, thus resolving the contradiction between light extraction efficiency and manufacturing complexity
Solution Approach 2:
The patent creates a composite material by incorporating metal nanoparticles (such as silver, gold, or aluminum) into the planarization layer matrix. This composite structure combines the planarization function with plasmonic light extraction enhancement, achieving improved light extraction efficiency through a relatively simple manufacturing process compared to photonic crystals or microcavity structures
2Illumination intensity
If voltage is improved to increase luminance of bottom emission OLED, then luminance is improved, but service life of device and material deteriorates
Solution Approach 1:
The patent converts the harmful effect of light trapping (which causes energy loss) into a beneficial effect by using metal-doped planarization layers to enhance light extraction. This improves luminance without requiring increased voltage, thereby preserving device and material service life
Solution Approach 2:
By changing the optical parameters of the planarization layer through metal nanoparticle doping, the patent improves light extraction efficiency and thus luminance output without increasing the electrical voltage, avoiding the degradation of device and material reliability that would result from higher voltage operation
3Loss of energy
If surface microstructure is formed on transparent electrode layer to reduce guided wave loss, then light extraction efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
Instead of changing the physical structure of the transparent electrode layer, the patent changes the material composition and optical parameters of the planarization layer by doping it with metal nanoparticles. This approach reduces guided wave loss and improves light extraction efficiency without creating complex surface structures, thus resolving the contradiction between energy loss reduction and structural complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The use of metal-doped planarization layers significantly improves light extraction efficiency, increasing the amount of light emitted into the air from OLEDs, addressing the limitations of existing technologies while maintaining electrical properties and avoiding chromatic aberration.
Implementation Method 1
the planarization layer is doped with metal micro/nanoparticles... enhances light extraction efficiency by utilizing surface plasmon resonance effects
Data Source
AI summary
The present invention provides an array substrate, a manufacturing method thereof, and a display device, belonging to the field of organic electroluminescence display technology, which may solve the problem of low light extraction efficiency of existing array substrates. The array substrate of the present invention comprises an organic light emitting device and a planarization layer disposed therebelow, the OLED comprises: a first electrode layer, a second electrode layer, and a light-emitting layer disposed between the first electrode layer and the second electrode layer, the first electrode layer is a transparent electrode layer and disposed on the planarization layer, and the planarization layer is doped with metal micro/nanoparticles.