Saturated Amber Light Source Using Phosphor Conversion
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Solution Overview
Problem
Existing LED chips emitting amber light are highly sensitive to temperature, resulting in a significant reduction in luminous flux as temperature increases, which affects their performance in applications requiring consistent color and brightness.
Innovation Solution
A light source device comprising a light source array that emits excitation light, a phosphor sheet to generate unsaturated amber light, and a cutoff filter to produce saturated amber light, which is insensitive to temperature fluctuations, thereby maintaining or increasing luminous flux at higher temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional amber LED chips are used to emit amber light, then the device can provide amber illumination, but the luminous flux significantly reduces as temperature increases
Solution Approach 1:
The invention segments the light generation process into two independent parts: (1) a blue LED light source array that emits excitation light, and (2) a phosphor sheet that converts the excitation light to amber light. This segmentation allows the temperature-sensitive amber light emission function to be separated from the blue LED light source, which has excellent temperature stability. The phosphor sheet can be optimized for temperature stability independently of the LED chip characteristics.
Solution Approach 2:
The invention changes the working parameters of the system by using a blue LED with wavelength of 440-475nm to excite a phosphor material, rather than using a traditional amber LED chip. This parameter change in the excitation source wavelength and the introduction of phosphor conversion enables the system to achieve temperature-stable amber light emission with significantly improved luminous flux at elevated temperatures.
2Reliability
If a phosphor sheet is used to convert blue light to amber light, then temperature stability is improved, but the light requires filtering to achieve saturation
Solution Approach 1:
The invention introduces a cutoff filter as an intermediary component between the phosphor sheet and the output. This filter selectively transmits the saturated amber light while blocking other wavelengths. Although this adds a component, the filter is a simple passive optical element that can be easily integrated into the light path, and it enables the system to achieve both temperature stability and color saturation simultaneously.
3Productivity
If the light source array operates at high temperature, then more light can be emitted, but traditional amber LED chips lose luminous flux
Solution Approach 1:
The invention inverts the traditional approach by not using an amber LED chip to directly emit amber light, but instead using a blue LED to excite a phosphor sheet that emits amber light. This inversion allows the system to leverage the temperature stability of blue LEDs while achieving amber light output, thereby maintaining luminous flux consistency even at high operating temperatures where traditional amber LEDs would fail.
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 light source device effectively generates saturated amber light with increased luminous flux at high temperatures, maintaining color consistency and brightness, thus addressing the temperature sensitivity issue of traditional amber LED lights.
Implementation Method 1
a phosphor sheet arranged in a propagation direction of the excitation light and configured to receive the excitation light to emit an excited unsaturated amber light
Implementation Method 2
a cutoff filter arranged along a propagation direction of the unsaturated amber light and configured to filter the unsaturated amber light to obtain a saturated amber light
Data Source
AI summary
The present disclosure discloses a light source device. The light source device comprises a light source array configured to emit an excitation light; a phosphor sheet arranged in a propagation direction of the excitation light and configured to receive the excitation light to emit an excited unsaturated amber light; and a cutoff filter arranged along a propagation direction of the unsaturated amber light and configured to filter the unsaturated amber light to obtain a saturated amber light.