Dual-Phosphor LED Light Engine for Wide Color Temperature Control
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Solution Overview
Problem
Conventional light emitting diodes (LEDs) have limitations in producing a wide range of light spectrums and color temperatures, which are essential for mimicking natural daylight and adjusting to human circadian rhythms, leading to unsatisfactory color rendering indices and stability issues.
Innovation Solution
A light emitting device with multiple LED portions, each comprising a light emitting diode chip and phosphor, capable of emitting daylight with a high color temperature and warm white light with a low color temperature, allowing independent control and combination to achieve various spectrums and color temperatures, utilizing specific phosphor compositions and a controller for voltage adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional light emitting diode uses a single phosphor material to produce white light, then the device structure is simple, but the scope of color temperature is narrow and the color rendering index is very low
Solution Approach 1:
The patent divides the single light emitting diode into multiple light emitting portions, each containing different phosphor materials (e.g., first phosphor with peak wavelength 480-520nm, second phosphor with peak wavelength 560-580nm). This segmentation allows each portion to contribute differently to the overall light spectrum, expanding the color temperature range while maintaining a unified device structure.
Solution Approach 2:
The patent employs composite phosphor materials with different emission characteristics within the same light emitting diode. By combining multiple phosphors with distinct peak wavelengths and emission profiles, the device achieves a broader color temperature range and improved color rendering index without requiring separate LED devices for different lighting conditions.
2Adaptability or versatility
If multiple light emitting portions with different phosphors are used to achieve various color temperatures, then the light spectrum versatility is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple light emitting portions into a single integrated light emitting diode device. The multiple portions are combined within one semiconductor structure, sharing common electrodes and packaging, which reduces manufacturing complexity compared to using separate LED devices. The merging approach allows different phosphor combinations to coexist and be controlled through a single device interface.
Solution Approach 2:
The patent creates a universal light emitting diode device that can produce multiple color temperatures and light spectrums through a single structure. The device incorporates multiple phosphor materials that can be selectively excited or combined to provide various lighting conditions, making the device adaptable to different applications without requiring multiple specialized devices.
3Reliability
If conventional phosphor materials are used to make white light, then the device structure is simple, but the stability of the light emitting device is unsatisfactory
Solution Approach 1:
The patent uses composite phosphor materials with specific compositions designed to improve stability. The first phosphor material (peak wavelength 480-520nm) and second phosphor material (peak wavelength 560-580nm) are selected and combined to achieve not only color temperature control but also enhanced operational stability and reduced degradation over time compared to conventional single phosphor systems.
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
Enables diverse applications by providing adjustable light spectrums and color temperatures, improving health by aligning with human circadian rhythms, while reducing complexity and cost through a single package solution.
Implementation Method 1
A light emitting diode is an electroluminescence device having a structure in which an n-type semiconductor of which major carriers are electrons and a p-type semiconductor of which major carriers are holes are joined together, and emits predetermined light through recombination of these electrons and holes
Implementation Method 2
A common method of making white light is to combine a part of the first light emitted from a light emitting diode chip and the second light which of wavelength is changed by phosphor
Data Source
AI summary
A light emitting device including a first light emitting portion that emits white light at a color temperature of 6000K or more and a second light emitting portion that emits white light at a color temperature of 3000K or less, which include light emitting diode chips and phosphors and are independently driven.