Core-Shell Metal Nanoparticle Plasmon Resonance for Display Light Intensity
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Solution Overview
Problem
In existing display devices, the backscattering of blue light by metal particles in the plasmon resonance layer reduces the intensity of red and green light emitted by the wavelength conversion layer, making it difficult to enhance the light intensity effectively.
Innovation Solution
A display device configuration where a light-emitting element layer is accompanied by a wavelength conversion layer, a dielectric layer, and a particle layer in that order, with the particle layer containing metal nanoparticles having a core-shell structure that expresses plasmon resonance, allowing leaked light to be backscattered and re-incident on the wavelength conversion layer, thereby increasing the intensity of converted light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If metal particles are placed in the wavelength conversion layer to express plasmon resonance, then the light intensity can be enhanced, but the excitation light is backscattered before irradiating the luminescent body, preventing effective increase of red and green light intensity
Solution Approach 1:
The patent divides the system into distinct functional layers: a light-emitting element layer that generates blue light, a wavelength conversion layer that converts blue light to red and green light, and a separate particle layer containing metal nanoparticles for plasmon resonance. This segmentation allows each layer to perform its specific function without interfering with others, solving the problem of excitation light being backscattered before reaching the luminescent body.
Solution Approach 2:
The patent positions the particle layer above the wavelength conversion layer on the light emission side, creating a vertical stacking arrangement. This spatial reconfiguration allows excitation light to first pass through the wavelength conversion layer to convert blue light to red and green light, and then the metal nanoparticles in the particle layer backscatter the remaining excitation light back toward the wavelength conversion layer, preventing energy loss.
2Productivity
If metal particles are placed in the wavelength conversion layer, then plasmon resonance occurs, but the blue light for excitation is always backscattered before irradiating the luminescent body, making it impossible to effectively increase red and green light intensity
Solution Approach 1:
By separating the wavelength conversion function and the plasmon resonance function into different layers, the patent ensures that the wavelength conversion layer can reliably convert blue light to red and green light without interference from metal particles causing premature backscattering. The particle layer independently handles plasmon resonance to backscatter excitation light, ensuring both conversion efficiency and emission stability.
Solution Approach 2:
The dielectric layer positioned between the wavelength conversion layer and the particle layer acts as an intermediary that optimizes the interaction between these two layers. It allows the excitation light to pass through to the wavelength conversion layer while enabling the backscattered light from the particle layer to effectively re-illuminate the wavelength conversion layer, thereby maintaining both conversion efficiency and emission stability.
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
This configuration increases the intensity of red and green light emitted by the wavelength conversion layer by effectively utilizing the backscattered excitation light from the metal nanoparticles, improving light emission characteristics.
Implementation Method 1
the particle layer includes metal nanoparticles including a core and a shell around the core... the metal nanoparticles express plasmon resonance with light from the light-emitting layer
Data Source
AI summary
A TFT layer; a light-emitting element layer including a first electrode, a light-emitting layer, and a second electrode; a wavelength conversion layer formed above the light-emitting element layer and being configured to convert a color of light from the light-emitting layer; a dielectric layer formed above the wavelength conversion layer; and a particle layer formed above the dielectric layer and including metal nanoparticles including a core and a shell around the core.