LED Package with Core-Shell Particles for Plasmonic Efficiency
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Solution Overview
Problem
Existing LED packages face challenges in miniaturization and light emitting efficiency when combining differently colored light emitting diodes, as the driving circuit complexity increases, and the reliability of fluorescent substances used for wavelength control is influenced by their light emitting efficiency and environmental exposure.
Innovation Solution
An LED package is designed with a light emitting diode, a fluorescent substance that absorbs and generates light of a different wavelength, and core-shell particles with a metal particle and insulating layer on its surface, which induces surface plasmon resonance to enhance light emitting efficiency and protect the fluorescent substance from environmental deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If differently colored light emitting diodes are combined in an LED package to control light color, then the color control capability is improved, but the driving circuit complexity increases and miniaturization becomes difficult
Solution Approach 1:
A fluorescent substance is introduced as an intermediary between the light emitting diode and the output light. The LED emits light at a specific wavelength, which is then converted to different wavelengths by the fluorescent substance, enabling color control without directly combining multiple colored LEDs. This mediator approach simplifies the driving circuit while maintaining color control capability.
Solution Approach 2:
The invention changes the wavelength parameter of the emitted light by using a fluorescent substance with specific optical properties. By selecting fluorescent substances with different emission characteristics, the output light color can be controlled without changing the LED itself or its driving circuit, thus simplifying the overall system complexity.
2Device complexity
If a fluorescent substance is used to control the emission color of the LED package, then the driving circuit complexity is reduced, but the light emitting efficiency and reliability are influenced by the fluorescent substance's performance
Solution Approach 1:
The invention uses a composite structure consisting of a light emitting diode combined with a fluorescent substance. This composite material approach allows the system to benefit from both the electrical-to-optical conversion efficiency of the LED and the wavelength transformation capability of the fluorescent substance, achieving improved overall reliability and efficiency while maintaining simple driving circuitry.
3Ease of manufacture
If the fluorescent substance is directly exposed to the external environment, then the manufacturing process is simplified, but the deterioration from moisture and temperature reduces lifespan
Solution Approach 1:
A encapsulation layer is used to protect the fluorescent substance from the external environment. This thin film or shell structure provides barrier protection against moisture and temperature while allowing the fluorescent substance to maintain its optical properties. The encapsulation extends the lifespan of the fluorescent substance without significantly complicating the manufacturing process.
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 surface plasmon resonance improves the light emitting efficiency of the fluorescent substance, increases its lifespan, and maintains color purity by scattering light effectively and shielding it from external environments, thereby enhancing the overall performance of the LED package.
Implementation Method 1
a fluorescent substance that absorbs the first light and generates a second light having a wavelength different from the first light
Implementation Method 2
The core-shell particle receives at least one light component of the first light and the second light to induce a surface plasmon resonance
Implementation Method 3
the lights generated by the light emitting diode and the fluorescent substance are scattered by the metal particle of each core-shell particle
Data Source
AI summary
A light emitting diode package includes a light emitting diode that emits a first light, a fluorescent substance that absorbs the first light and generates a second light having a wavelength different from the first light, and at least one core-shell particle disposed on a surface of the fluorescent substance. The core-shell particle includes a metal particle and an insulating layer coated on a surface of the metal particle. The core-shell particle receives at least one light component of the first light and the second light to induce a surface plasmon resonance.