Light-Emitting Film With Quantum Dot Nanoparticles and Blocking Layer
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Solution Overview
Problem
Conventional illumination devices, such as backlight units for displays, face challenges in consistently producing desired light, like white light, and maintaining performance over a long period due to instability and sensitivity to external factors.
Innovation Solution
A light-emitting film comprising a light-emitting layer with nanoparticles, such as quantum dots, and a binder, where the nanoparticles absorb and emit light across specific wavelengths, combined with a blocking film to protect against moisture and oxygen, ensuring stable and long-lasting light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional phosphors are used in illumination devices, then white light can be produced, but the device exhibits instability and sensitivity to external factors, leading to performance degradation over time
Solution Approach 1:
The patent employs quantum dots as light-emitting nanoparticles embedded in a polymer matrix to create a composite light-emitting film. This composite structure combines the superior optical properties of quantum dots with the protective and stabilizing characteristics of the polymer matrix, resulting in enhanced reliability and longevity compared to conventional phosphor-based illumination devices.
Solution Approach 2:
The patent utilizes the quantum confinement effect by precisely controlling the size parameter of quantum dots (typically 2-50 nm) to tune their optical emission properties. This parameter control allows for stable and predictable light emission across different wavelengths, improving device reliability while maintaining consistent performance over extended service life.
2Use of energy by moving object
If quantum dots are used as light-emitting nanoparticles, then light emission efficiency and color purity are improved, but the device becomes more sensitive to moisture and oxygen, requiring protective measures
Solution Approach 1:
The patent encapsulates quantum dots within a polymer matrix film that acts as a protective shell. This thin film structure provides effective barrier protection against moisture and oxygen penetration, preventing degradation of the quantum dots while maintaining their high light emission efficiency and color purity.
Solution Approach 2:
The patent creates a composite structure where quantum dots are dispersed and protected within a polymer matrix. This composite material combines the optical superiority of quantum dots with the protective properties of the polymer, simultaneously achieving high light emission efficiency and resistance to environmental harmful factors.
3Illumination intensity
If nanoparticles are used to improve light emission, then the device complexity increases due to the need for precise nanoparticle control and protection mechanisms
Solution Approach 1:
The patent combines multiple functions into a single integrated light-emitting film structure. The quantum dots provide light emission while the polymer matrix simultaneously provides structural support, protection from environmental factors, and optical coupling. This merging of functions reduces overall device complexity compared to separate components for each function.
Solution Approach 2:
The patent controls the size, shape, and distribution parameters of quantum dots during synthesis to achieve optimal light emission properties. By precisely controlling these parameters, the patent maximizes illumination intensity and color purity while minimizing the complexity of additional control mechanisms needed.
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 effectively produces desired light, like white light, and maintains performance stability over time by using nanoparticles and a protective blocking film, enhancing durability and light-emitting efficiency.
Implementation Method 1
the light-emitting nanoparticles may be nanoparticles (hereinafter, possibly referred to as green particles) capable of absorbing light of any one wavelength within a range of 420 to 490 nm and emitting light of any one wavelength within a range of 490 to 580 nm
Data Source
AI summary
The present application relates to a light-emitting film, an illumination device, and a display device. The present application may provide a light-emitting film and the use thereof, the light-emitting film being capable of effectively generating a desired light, such as white light, and stably maintaining the performance thereof for a long period of time.