InP Core Nanoparticles for Display Color Conversion
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) suffer from low optical efficiency due to the reduction in light amount by color conversion members, which limits color purity and reproducibility, and viewing angle.
Innovation Solution
Semiconductor nanoparticles with a specific structure, including a central InP core, an inner phosphide shell, a middle ZnSe or ZnSexS1-x shell, and an outer Group II-VI compound shell, are used in a color conversion member to absorb blue light and emit visible light with high color purity and wide viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional color conversion members are used in LCDs, then color images can be displayed, but optical efficiency is reduced due to light amount reduction
Solution Approach 1:
The patent changes the material composition parameters of the color conversion layer by incorporating semiconductor nanoparticles with specific bandgap energies. This allows optimization of light absorption and emission characteristics, improving optical efficiency while maintaining color display performance.
Solution Approach 2:
The patent uses composite material structure combining semiconductor nanoparticles (InP, InGaP, InAlP) with other materials to create a color conversion layer that achieves both high optical efficiency and excellent color purity. The composite structure enables simultaneous optimization of multiple performance parameters.
2Manufacturing precision
If conventional color conversion members are used, then color display is achieved, but color purity and reproducibility are limited
Solution Approach 1:
The patent achieves high color purity by precisely controlling the composition parameters of semiconductor nanoparticles (ratios of In, Ga, Al, P) and their size distribution. By adjusting these parameters, the emission spectrum can be optimized to achieve narrow FWHM and excellent color reproducibility.
3Adaptability or versatility
If conventional color conversion members are used, then color images are displayed, but viewing angle is limited
Solution Approach 1:
The patent employs composite material systems that combine semiconductor nanoparticles with specific matrix materials and encapsulation structures. This composite approach maintains high light output while achieving wide viewing angles through optimized optical properties of the composite system.
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 semiconductor nanoparticles achieve excellent quantum efficiency and color reproducibility with a narrow full width at half maximum (FWHM) of 60 nm or less, enhancing optical efficiency and viewing angle in display devices.
Implementation Method 1
When quantum dots reach an energy excited state by receiving light from an excitation source, they emit energy according to a corresponding energy band gap by themselves
Implementation Method 2
Semiconductor nanoparticles are nanocrystals of semiconductor materials, exhibit a quantum confinement effect
Data Source
AI summary
A semiconductor nanoparticle for a color conversion member of a display device includes: a central portion including at least one of i) InP, ii) a ternary compound consisting of indium, phosphorus, and one element of Groups I-VII, and iii) InP doped with at least one transition metal of Groups I-VII; an inner portion proximate to the central portion and including a phosphide of at least one of boron, aluminum, and gallium; a middle portion proximate to the inner portion and including at least one of ZnSe and ZnSexS1-x; and an outer portion proximate to the middle portion and including one or more compounds of Groups II-VI, wherein x is 0<x<1.