Raspberry-like Particle Light Extraction Layer
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Solution Overview
Problem
Organic light-emitting diode (OLED) devices suffer from low light extraction efficiency due to reflection at material interfaces, with existing diffusion layers providing unsatisfactory results and complicating manufacturing processes.
Innovation Solution
A light-diffusion layer composed of a resin and uniformly dispersed raspberry-like particles with a surface featuring multiple round bumps, made from materials with a single refractive index, enhances light extraction efficiency and reduces color shift by scattering light effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a diffusion layer composed of solid organic particles or inorganic particles with high refractive index is used, then light scattering effect is achieved, but light extraction efficiency remains unsatisfactory
Solution Approach 1:
The invention changes the physical state parameter of the diffusion layer from solid particles to liquid micro-droplets. This parameter change enables the use of materials with smaller refractive index differences (still effective for scattering) while achieving superior light extraction efficiency. The liquid state allows for better optical matching and reduced internal reflection compared to solid particles.
Solution Approach 2:
The invention creates a composite diffusion layer by dispersing multiple different liquid materials with varying refractive indices into the resin matrix. This composite approach allows optimization of light scattering properties through the combination of different liquid phases, achieving enhanced light extraction efficiency that neither single material could provide alone.
2Loss of energy
If a diffusion layer with microlens or solid inorganic particles is used, then light extraction efficiency improves, but the manufacturing process becomes more complex
Solution Approach 1:
The invention merges the light scattering function and the diffusion function into a single integrated layer containing dispersed liquid micro-droplets. This eliminates the need for separate microlens layers or multiple particle layers, simplifying the manufacturing process while maintaining effective light extraction. The liquid droplets naturally form during coating without requiring additional structuring steps.
Solution Approach 2:
The invention uses simple liquid materials that can be easily dispersed and coated, replacing complex solid particle systems that require precise handling and processing. The liquid micro-droplets can be formed through simple mixing and coating processes, making the manufacturing more cost-effective and less complex.
3Illumination intensity
If scattering particles of special shape are used, then brightness and anti-adhesive properties improve, but materials of two different refractive indices are required
Solution Approach 1:
The invention changes the shape parameter of the scattering elements from complex special shapes to simple spherical micro-droplets. This simplification, combined with the liquid state, allows effective light scattering and brightness enhancement using materials with smaller refractive index differences, eliminating the requirement for two different refractive index materials.
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 solution improves light extraction efficiency by more than 11% and reduces color shift by over 75%, simplifying the manufacturing process and maintaining cost-effectiveness.
Implementation Method 1
a plurality of raspberry-like particles uniformly dispersed in the resin, wherein the raspberry-like particles feature a surface with a plurality of round bumps
Data Source
AI summary
The invention provides a light-extraction element, comprising a light-diffusion layer which including a resin; and a plurality of raspberry-like particles uniformly dispersed in the resin, wherein the raspberry-like particles feature a surface with a plurality of round bumps, and the plurality of raspberry-like particles are composed of a material having a single reflective index. The invention also provides a light-emitting device, including a pair of electrodes composed of an anode and a cathode; an organic light-emitting unit disposed between the pair of electrodes, wherein the organic light-emitting unit includes a light-emitting layer; and a light-extraction element which is disposed on a light-emitting surface of the light-emitting device.