Optoelectronic Component KSF Phosphor Saturation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Optoelectronic components containing potassium-silicon-fluoride phosphors face issues such as saturation effects at high excitation intensities, low ageing stability, and difficulty in achieving high CRI/R9 values, especially in high CRI ranges, due to their long rise time and spectral limitations.
Innovation Solution
Incorporating a semiconductor chip that emits primary blue radiation and a conversion element with three phosphors, including a potassium-silicon-fluoride phosphor, a broadband red phosphor, and a green phosphor, to achieve Ra values of at least 80 and R9 values of at least 75, enabling the emission of white mixed radiation and improving colour rendering index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If potassium-silicon-fluoride phosphor is used as red component, then narrow emission band is achieved, but saturation effects occur at high excitation intensities leading to parameter changes
Solution Approach 1:
The patent combines potassium-silicon-fluoride phosphor (third phosphor) with another red phosphor (second phosphor) to create a hybrid red emission system. This merging allows the narrow emission band characteristics of KSF to be preserved while the saturation effects are mitigated by the additional phosphor material that does not exhibit the same saturation behavior at high excitation intensities.
Solution Approach 2:
The patent uses a composite phosphor system consisting of multiple phosphor materials (first green phosphor, second red phosphor, and third KSF phosphor) to achieve the desired emission characteristics. This composite approach allows the system to benefit from the narrow emission band of KSF while being compensated for its saturation issues by the other phosphor components.
2Measurement precision
If potassium-silicon-fluoride phosphor is used, then narrow emission band is achieved, but long rise time results in low ageing stability
Solution Approach 1:
The patent merges potassium-silicon-fluoride phosphor with another red phosphor that has different temporal characteristics. This combination allows the system to achieve narrow emission band while the second red phosphor compensates for the long rise time issue, improving overall ageing stability under PWM dimming conditions.
Solution Approach 2:
The patent changes the temporal response parameters of the red emission system by introducing a second red phosphor with different rise and decay characteristics. This parameter modification allows the system to maintain narrow emission bandwidth while achieving better temporal response and ageing stability.
3Measurement precision
If potassium-silicon-fluoride phosphor is used, then narrow emission band is achieved, but difficulty in achieving high CRI/R9 values occurs
Solution Approach 1:
The patent combines potassium-silicon-fluoride phosphor with both a green phosphor and another red phosphor to create a three-phosphor system. This merging provides additional degrees of freedom in spectral engineering, allowing the system to achieve both narrow emission band and high CRI/R9 values by optimizing the combination and ratios of all three phosphor materials.
Solution Approach 2:
The patent employs a composite phosphor system with three different phosphor materials to achieve the desired color rendering properties. This composite approach allows simultaneous optimization of multiple parameters including emission bandwidth, CRI, and R9 values, overcoming the limitations of using KSF alone.
4Measurement precision
If potassium-silicon-fluoride phosphor is used, then narrow emission band is achieved, but CCT range is restricted
Solution Approach 1:
The patent merges potassium-silicon-fluoride phosphor with a green phosphor and another red phosphor to create a versatile three-phosphor system. This combination provides greater adaptability in adjusting the overall emission spectrum, allowing the system to achieve narrow emission band for KSF while simultaneously expanding the usable CCT range through proper selection and ratio adjustment of all phosphor components.
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 configuration enhances the colour rendering index and stability of optoelectronic components, allowing for higher Ra/R9 values and increased spectral efficiency, overcoming the limitations of potassium-silicon-fluoride phosphors alone.
Implementation Method 1
a conversion element including at least three phosphors each converting the primary radiation into secondary radiation
Data Source
AI summary
An optoelectronic component includes a semiconductor chip that emits primary radiation from the blue spectral region, a conversion element including at least three phosphors each converting the primary radiation into secondary radiation, wherein the first phosphor emits secondary radiation from the green spectral region, the second phosphor emits secondary radiation from the red spectral region, the third phosphor is a potassium-silicon-fluoride phosphor that emits secondary radiation from the red spectral region, and the component has an Ra value of at least 80 and an R9 value of at least 75, and emits white mixed radiation.