Luminescent Material Lighting Device Color Temperature Uniformity
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Solution Overview
Problem
Current white LED lighting devices with adjustable color temperature use separate red, green, and blue LEDs, resulting in a non-uniform appearance with visible color spots, whereas a lighting device that emits white light uniformly across its surface is desired for various applications.
Innovation Solution
A lighting device comprising a luminescent material represented by the formula (M′)8(M″M″′)6O24(X,X′)2, exposed to electromagnetic radiation of two different wavelength ranges (230-330 nm and 300-600 nm), with a metering unit adjusting the irradiance ratio to adjust the color temperature of the emitted white light, ensuring a uniform white appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate red, green and blue LEDs are used to construct white light with adjustable color temperature, then color temperature adjustment capability is improved, but appearance uniformity deteriorates due to visible color spots
Solution Approach 1:
The patent combines multiple excitation sources (UV LED at 380-405nm and blue LED at 430-470nm) to simultaneously excite a single phosphor material, merging their functions into one integrated lighting system that produces uniform white light without visible color spots while maintaining color temperature adjustability
Solution Approach 2:
The patent uses a composite phosphor material with specific composition (M8(M''M''')6O24(X,X')2) that can be excited by multiple wavelength ranges to emit uniform white light, combining the properties of different elements to achieve both appearance uniformity and color temperature control
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 allows for the adjustment of color temperature within a wide range (2000-13000 K) while maintaining a uniform white appearance, enhancing the aesthetic appeal and functionality of the lighting device.
Implementation Method 1
a luminescent material configured to emit white light when being exposed to electromagnetic radiation of a preselected wavelength range
Data Source
AI summary
A lighting device for adjusting the color temperature of white light emitted by a luminescent material is disclosed. The lighting device comprises: a luminescent material configured to emit white light when being exposed to electromagnetic radiation of a preselected wavelength range; at least one excitation unit configured to expose the luminescent material to electromagnetic radiation of a first wavelength range selected from the range of 230-330 nm; at least one excitation unit configured to expose the luminescent material to electromagnetic radiation of a second wavelength range, different from the first wavelength range, selected from the range of 300-600 nm; a metering unit configured to adjust the ratio of the irradiances of electromagnetic radiation of first wavelength range and of electromagnetic radiation of second wavelength range that is exposed on the luminescent material.