Laser-Phosphor Package Layout for High-Brightness White Light
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Solution Overview
Problem
Existing lighting technologies, such as conventional light bulbs and fluorescent lighting, have limitations in efficiency, lifespan, and cost-effectiveness, while LEDs have limitations in color rendering and efficiency for white light production.
Innovation Solution
A compact, high-brightness, and highly-efficient white light source is achieved by integrating a violet, blue, or other wavelength laser diode source based on gallium and nitrogen materials with phosphor materials, specifically yellow phosphors, to convert the laser radiation into white light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional light bulbs are used, then simplicity and ease of manufacture are maintained, but efficiency and lifespan are poor
Solution Approach 1:
The patent transitions from thermal radiation (incandescent) to photoluminescence conversion by changing the fundamental operating principle and material parameters, achieving high efficiency while maintaining manufacturing simplicity through standardized LED chip and phosphor integration processes
Solution Approach 2:
The invention combines LED chips with phosphor materials to create a composite light source that converts blue/violet LED light into white light, achieving both high efficiency and long lifespan while maintaining ease of manufacture through established composite material processing techniques
2Loss of energy
If fluorescent lighting is used, then efficiency is improved compared to incandescent, but lifespan and cost-effectiveness are limited
Solution Approach 1:
The patent changes from gas discharge luminescence to solid-state photoluminescence conversion, eliminating the limitations of fluorescent lamp lifespan and mercury content while maintaining high energy efficiency through LED-phosphor integration
Solution Approach 2:
The invention uses inexpensive LED chips with long operational lifetimes combined with phosphor materials, replacing the need for expensive, short-lived fluorescent tubes while achieving both cost-effectiveness and durability
3Loss of energy
If LEDs are used for white light production, then efficiency and lifespan are improved, but color rendering is limited
Solution Approach 1:
The patent applies different phosphor materials with specific emission characteristics to different regions or layers, combining blue phosphors for high efficiency with yellow/red phosphors for improved color rendering, achieving both energy efficiency and accurate color representation
Solution Approach 2:
The invention uses composite phosphor systems combining multiple phosphor materials (yellow phosphors, red phosphors) with blue LED chips to achieve full-spectrum white light output that maintains high efficiency while improving color rendering properties
4Illumination intensity
If laser diode and phosphor materials are integrated, then brightness and efficiency are improved, but device complexity increases
Solution Approach 1:
The patent merges the laser diode chip and phosphor materials into a single integrated package, eliminating the need for separate light sources and optical components, thereby achieving high brightness while reducing overall device complexity through functional integration
Solution Approach 2:
The integrated laser-phosphor module serves multiple functions simultaneously: light generation, wavelength conversion, and color mixing, replacing what would otherwise require multiple separate components and achieving high brightness with simplified device architecture
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 integrated approach provides a cost-effective, high-brightness white light source with improved efficiency and longer lifespan compared to traditional lighting technologies, suitable for various applications including general lighting, automotive, and recreational uses.
Implementation Method 1
An LED is a two-lead semiconductor light source typically based on a p-i-n junction diode, which emits electromagnetic radiation when activated. When a suitable voltage is applied to the leads, electrons and holes recombine within the device releasing energy in the form of photons. This effect is called electroluminescence
Implementation Method 2
a wavelength conversion material coupled to the optically transparent material and configured to receive at least a portion of the electromagnetic radiation emitted into the groove and transmitted through the optically transparent material, the wavelength conversion material configured to convert at least a fraction of the electromagnetic radiation in the laser beam with a first wavelength to a second wavelength that is longer than the first wavelength
Implementation Method 3
the thermally conductive material having a top surface with a reflective coating
Data Source
AI summary
A phosphor integrated laser-based light source includes a thermally conductive material arranged on a package base adjacent to a laser diode chip and an optically transparent material coupled to the thermally conductive material. A groove extends between the thermally conductive material and the optically transport material and is aligned to receive electromagnetic radiation from the laser diode chip. A wavelength conversion material is coupled to the optically transparent material and is configured to receive at least a portion of the electromagnetic radiation emitted into the groove and transmitted through the optically transparent material. A reflective material surrounds sides of the optically transparent material and the wavelength conversion material.