LED Light Conversion Layer with Quantum Dots for Spectrum Tuning
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Solution Overview
Problem
Conventional white LEDs using red, green, and blue phosphors have limited light conversion efficiencies and spectra that are not easily adjustable, making it difficult to achieve an optimum white light source.
Innovation Solution
A light emitting diode (LED) design incorporating a light conversion layer with wavelength conversion particles, such as quantum dots, dispersed in an organic solution between substrates, which converts light into different wavelengths to generate white light, enhancing efficiency and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional phosphors (red, green, blue) are used around a UV LED, then white light can be generated, but the light conversion efficiency is limited and the emission spectrum cannot be easily adjusted
Solution Approach 1:
The patent uses quantum dot phosphors where the emission wavelength can be precisely controlled by changing the particle size parameter. By adjusting the size of quantum dots (typically 2-50 nm), different emission wavelengths can be achieved, enabling flexible spectrum adjustment while maintaining high light conversion efficiency due to the quantum confinement effect
Solution Approach 2:
The patent employs composite material structures including quantum dot phosphors combined with specific resins or matrices. These composite materials integrate the size-tunable optical properties of quantum dots with the structural and protective properties of surrounding materials, achieving both high efficiency and adjustable emission spectra
2Stability of the object's composition
If resin is used as the matrix for quantum dot phosphors, then the quantum dots are stabilized and dispersed, but the organic resin interacts with the organic ligands on the quantum dot surface, reducing efficiency and durability
Solution Approach 1:
The patent introduces an intermediary protective layer or shell around the quantum dots, or uses surface-modified quantum dots with inert outer shells that prevent direct interaction between the organic resin matrix and the organic ligands on the quantum dot surface. This intermediary structure maintains stable dispersion while protecting the quantum dots from chemical degradation
Solution Approach 2:
The patent creates an inert environment around the quantum dots by using chemically inert materials as the protective matrix or encapsulation layer. This inert environment prevents harmful chemical interactions between the resin and quantum dot ligands, thereby improving durability while maintaining 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
The LED design achieves high efficiency and long durability by effectively converting light into desired wavelengths, producing a more optimal white light source with improved light emission characteristics.
Implementation Method 1
a light conversion layer which converts received light to light with different wavelength
Data Source
AI summary
A light emitting diode (LED). In one embodiment, the LED comprises a base including a cavity, an LED chip disposed on a bottom of the cavity and configured to generate a first light, and a light conversion layer. The light conversion layer includes an upper substrate, a lower substrate and a wavelength conversion particle. The light conversion layer is configured to convert a portion of the first light into a second light according to light emitted by the wavelength conversion particle. Furthermore, the light conversion layer is disposed on an upper surface of the base.