LED Scattering Body Temperature-Dependent Refractive Index
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Solution Overview
Problem
Conventional light-emitting diodes (LEDs) experience significant temperature-dependent changes in luminous flux and spectral composition, leading to unstable emission characteristics, which can result in undesirable color shifts and reduced brightness, particularly affecting applications like automotive lighting and liquid crystal displays.
Innovation Solution
The LED incorporates a scattering body with a transparent matrix material and embedded scattering particles, where the refractive index difference between the matrix and particle materials changes with temperature, adjusting the scattering properties to maintain consistent light emission across temperature variations, without altering the radiation spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional LEDs are used without scattering bodies, then the structure is simple and manufacturing is easy, but the spectral emission characteristic becomes unstable and color shifts occur at different temperatures
Solution Approach 1:
A scattering body is introduced as an intermediary component between the semiconductor chip and the environment. This scattering body contains scattering particles that modify the optical path of emitted light without absorbing or converting wavelengths, thereby stabilizing the spectral emission characteristic across different temperatures while maintaining a relatively simple overall structure.
Solution Approach 2:
The scattering body utilizes temperature-dependent changes in the refractive index of the scattering particles relative to the matrix material. As temperature changes, the refractive index difference varies, causing the scattering body to dynamically adjust its scattering properties and compensate for spectral shifts, thus maintaining stable emission characteristics.
2Illumination intensity
If a scattering body with high refractive index difference is used to enhance scattering effect at room temperature, then scattering performance is improved, but the scattering effect becomes too strong and cannot compensate for temperature-induced luminous flux changes
Solution Approach 1:
The invention selects scattering particles and matrix material with specific refractive index characteristics that change with temperature. The refractive index difference between particle and matrix is optimized to provide appropriate scattering at room temperature while decreasing at operating temperatures, enabling the scattering body to compensate for luminous flux reduction without causing excessive scattering at lower temperatures.
Solution Approach 2:
The scattering body is designed with specific optical properties localized to the scattering particles and matrix material combination. The refractive index characteristics of these materials are carefully selected to create the desired temperature-dependent scattering behavior, where the local optical properties change in response to temperature variations to maintain overall luminous flux stability.
3Illumination intensity
If scattering particles with large size are used to increase scattering cross-section, then scattering efficiency is improved, but the scattering body becomes less transparent and may alter the radiation spectrum
Solution Approach 1:
The invention utilizes temperature-dependent refractive index changes to enable scattering particles of a specific size range to provide adequate scattering efficiency. The refractive index difference compensation mechanism allows smaller particles to achieve effective scattering without causing excessive opacity or spectral alteration, as the scattering strength is dynamically adjusted with temperature.
Solution Approach 2:
The scattering body is constructed as a composite material system consisting of scattering particles embedded in a matrix material. The combination of specific particle materials (such as glass, plastic, or ceramic particles) with a suitable matrix creates a composite with optimized optical properties, achieving balanced scattering efficiency and transparency while maintaining spectral integrity.
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
This design ensures a stable and temperature-insensitive luminous flux, minimizing color changes and maintaining desired light characteristics from room temperature to higher operating temperatures, thus addressing the temperature-dependent issues in conventional LEDs.
Implementation Method 1
The scattering body has a matrix material which is transmissive to radiation, preferably a clear-sighted and transparent matrix material, in which scattering particles are embedded
Implementation Method 2
A change in temperature changes a refractive index difference between the matrix material and the particle material
Data Source
Figure 1~2B
Figure 3A~4
AI summary
In at least one embodiment of the optoelectronic semiconductor component (1), the latter comprises an optoelectonic semiconductor chip (2). The semiconductor component (1) furthermore comprises at least one scattering body (34) comprising a radiation-transmissive matrix material (3) and scattering particles (4) composed of a particle material embedded therein. The scattering body (34) is disposed downstream of the semiconductor chip (2). In the event of a temperature change, a difference in refractive index between the matrix material (3) and the particle material changes. At a temperature of 300 K, the difference in refractive index between the matrix material (3) and the particle material is at most 0.15.