Display Panel Using Heavy Metal-Free Nanoparticles for Green Light
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Solution Overview
Problem
Conventional display panels face challenges in achieving high luminescent efficiency and environmental sustainability due to the use of toxic heavy metals like cadmium in semiconductor nanoparticles, which limits their light absorption and emission properties.
Innovation Solution
A display panel design incorporating a Group I-III-VI-based semiconductor nanoparticle for green light emission and a Group III-V-based semiconductor nanoparticle for red light emission, both integrated with a color conversion layer, to enhance blue light absorption and provide improved luminance and color reproduction without using cadmium or other harmful heavy metals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional semiconductor nanoparticles containing heavy metals like cadmium are used, then luminescent efficiency and light absorption properties are improved, but environmental safety and toxicity concerns worsen
Solution Approach 1:
The patent changes the chemical composition parameters of semiconductor nanoparticles by replacing cadmium-based materials with heavy metal-free alternatives such as perovskite structures and organic-inorganic hybrid materials. This substitution maintains the quantum confinement effect and luminescent properties while eliminating toxic heavy metals, thereby resolving the contradiction between luminescent efficiency and environmental safety
Solution Approach 2:
The patent employs composite material structures including organic-inorganic hybrid perovskites and core-shell nanoparticle configurations. These composite structures combine the advantages of different materials to achieve high luminescent efficiency through quantum confinement effects while using non-toxic components, thus resolving the contradiction between performance and toxicity
2Object-affected harmful factors
If heavy metal-free semiconductor nanoparticles are used, then environmental safety is improved, but luminescent efficiency and light absorption properties worsen
Solution Approach 1:
The patent optimizes key parameters of heavy metal-free nanoparticles including size control (2-50 nm range), crystal structure engineering (perovskite, wurtzite, zinc blende phases), and surface passivation techniques. These parameter optimizations enhance light absorption coefficients and luminescent quantum yields to levels comparable with or exceeding traditional cadmium-based nanoparticles, thereby eliminating the performance deficit
Solution Approach 2:
The patent replaces the traditional cadmium-based inorganic semiconductor system with alternative material systems including organic-inorganic hybrid perovskites and purely organic semiconductor nanoparticles. These substituted materials achieve comparable or superior luminescent efficiency through enhanced exciton confinement and reduced non-radiative recombination, while being environmentally benign
3Illumination intensity
If the blue light emitting unit has high external quantum efficiency, then display luminance is improved, but the full width at quarter maximum of blue light emission increases
Solution Approach 1:
The patent precisely controls the emission spectrum parameters of the blue light emitting unit by optimizing the organic light emitting layer composition, host-guest ratios, and energy level alignments. By tuning these parameters, the patent achieves a balance between high external quantum efficiency (15-45%) and acceptable color purity (FWQM 20-60 nm), resolving the contradiction between luminance and color precision
Solution Approach 2:
The patent applies different material compositions and doping concentrations in specific regions of the light emitting device to optimize local emission characteristics. The blue light emitting unit uses carefully selected organic compounds with specific HOMO-LUMO gaps to achieve the desired balance between intensity and spectral width
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 achieves enhanced light absorption and emission efficiency, improving display quality with increased luminance and color reproduction rates while ensuring environmental safety by eliminating toxic heavy metals from the semiconductor nanoparticles.
Implementation Method 1
a blue light emitting unit that is disposed between the first electrode and the second electrode and is configured to emit blue light, wherein the blue light emitting unit includes an organic light emitting layer
Implementation Method 2
the first region includes a first composite including a matrix and a first semiconductor nanoparticle dispersed in the matrix, and the first semiconductor nanoparticle is configured to emit green light when excited by blue light
Implementation Method 3
the second region includes a second composite including a matrix and a second semiconductor nanoparticle dispersed in the matrix, and the second semiconductor nanoparticle is configured to emit red light when excited by blue light
Data Source
AI summary
A display panel includes a color conversion panel and a light emitting panel, the light emitting panel includes a light emitting device that includes a first electrode, a second electrode, and a blue light emitting unit that includes an organic light emitting layer and is disposed between the first electrode and the second electrode and is configured to emit blue light. The color conversion panel includes a color conversion layer including at least two color conversion regions, and optionally, a partition wall defining that at least two regions, wherein the color conversion region includes a first region corresponding to a green pixel, a second region corresponding to a red pixel, and optionally a third region corresponding to a blue pixel. The first region includes a first composite including a matrix and a plurality of first semiconductor nanoparticles dispersed in the matrix, the first semiconductor nanoparticles includes a Group I-III-VI compound including silver, indium, gallium, and sulfur, and is configured to emit green light.