LED Illuminating Device with Sapphire Circuit Board and Fluorescent Films
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current LED lighting technologies, particularly those using white light LEDs, lack sufficient red light components, resulting in low color rendering index (CRI) and inefficient luminous performance, which fails to replicate natural light effectively.
Innovation Solution
An LED illuminating device and method that incorporates a sapphire-based LED circuit board with multilayer fluorescent films, including red, green, and blue fluorescent materials, carefully designed and deposited to enhance light conversion efficiency and color rendering, using specific dopants and processing techniques to improve spectral performance and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If white light LED with yellow fluorescent powder is used, then luminous efficiency is improved (120 lm/W), but color rendering index deteriorates (CRI only about 80, R9 about 10) due to lack of red light component
Solution Approach 1:
The patent combines multiple LED chips (blue LED chip and red LED chip) with multiple fluorescent powder combinations (yellow fluorescent powder and red fluorescent powder) into a single illuminating device. This merging approach integrates the high efficiency of blue LED with yellow phosphor and the red light supplementation, achieving both high luminous efficiency and excellent color rendering (CRI≥95, R9≥90).
Solution Approach 2:
The patent uses composite fluorescent powder materials including yellow fluorescent powder (Y3Al5O12:Ce, Lu3Al5O12:Ce) and red fluorescent powder (CaAlSiN3:Eu, Sr2Si5N8:Eu) coated on different LED chips. These composite material combinations enable the device to simultaneously achieve high efficiency and superior color rendering properties that neither material could achieve alone.
2Illumination intensity
If red light chip or red fluorescent powder is added to compensate red light, then color rendering index is improved, but luminous efficiency deteriorates due to low efficiency of red light sources
Solution Approach 1:
The patent merges a red LED chip (with higher efficiency than traditional red fluorescent powder) with yellow fluorescent powder on the same circuit board. The red LED chip provides efficient red light output while the yellow fluorescent powder converts blue light to yellow, creating a synergistic effect that maintains high overall luminous efficiency while achieving excellent color rendering (R9≥90).
Solution Approach 2:
The patent changes the key parameter of red light generation from using low-efficiency red fluorescent powder to using a red LED chip with superior efficiency. This parameter change (switching the light generation mechanism) enables the system to achieve both high color rendering and high luminous efficiency by selecting a more efficient red light source technology.
3Illumination intensity
If multiple LED chips and fluorescent powders are combined to improve spectrum, then device complexity increases, but manufacturing precision requirements worsen due to multiple coating and assembly steps
Solution Approach 1:
The patent segments the illuminating device into distinct functional modules: a first LED chip (blue) with yellow fluorescent powder and a second LED chip (red) with red fluorescent powder, each mounted on separate circuit board regions. This segmentation allows for standardized, independent manufacturing of each module, reducing overall assembly complexity and making it easier to control coating and assembly precision for each separate unit.
Solution Approach 2:
The patent applies different fluorescent powder compositions and coating techniques to different local regions of the circuit board. The yellow fluorescent powder is coated on the blue LED chip area while red fluorescent powder is coated on the red LED chip area. This local quality approach allows optimization of each region's spectral output while maintaining manageable manufacturing precision requirements through region-specific processing.
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 achieves a high color rendering index (CRI) of 95-100, enhanced luminous efficiency, and a longer working life, closely approximating natural light with improved spectral coverage and stability, addressing the limitations of existing white LED lighting.
Implementation Method 1
The industrial realization of white light is by coating fluorescent powder on the LED chip, which is the white light converted from fluorescence
Implementation Method 2
The fluorescent powder is one of the key technologies and raw materials in white light. First, the excitation spectrum of the fluorescent powder must match the emission spectrum of the selected chip
Implementation Method 3
the LED circuit board is disposed above the heat dissipator
Data Source
AI summary
An LED illuminating device and a preparation method therefor. The device is characterized by comprising an LED component (101), an LED circuit board (100), a heat dissipator (200), and a power supply controller (400). The LED component (101) is disposed on the LED circuit board (100), the LED circuit board (100) is disposed above the heat dissipator (200), and the power supply controller (400) is connected to the LED circuit board (100) by means of a conductive wire. The LED illuminating device can emit approximate natural light.