Reflective Side Coating for LED Heat Dissipation
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Solution Overview
Problem
LED devices face excessive thermal stress due to poor heat dissipation, leading to performance degradation, color drift, and reduced quantum efficiency, necessitating improved packaging designs for efficient heat management.
Innovation Solution
A light-emitting device package featuring a semiconductor structure with an insulating side coating and a reflective side coating, where the reflective coating is thermally coupled to the wavelength converter to enhance heat dissipation while preventing electrical shorting, and is applied using a scalable and cost-efficient capillary action process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional LED packaging is used, then the device structure is simple, but heat dissipation is poor leading to excessive thermal stress
Solution Approach 1:
The packaging structure is segmented into multiple functional layers: a substrate layer, an insulating side coating layer, and a reflective side coating layer. Each layer performs a specific function - the substrate provides mechanical support, the insulating layer prevents electrical shorting, and the reflective layer directs light and manages heat. This segmentation allows complex heat dissipation functionality to be achieved through modular, manageable components.
Solution Approach 2:
The patent employs composite material structures combining different properties: the insulating side coating provides electrical insulation while the reflective side coating provides both optical reflection and thermal management. This composite approach allows simultaneous achievement of electrical isolation and improved heat dissipation without requiring a single material to perform all functions.
2Reliability
If the reflective coating is applied to enhance heat dissipation, then thermal stress is reduced, but electrical shorting risk increases
Solution Approach 1:
The insulating side coating acts as an intermediary layer between the substrate and the reflective side coating. This intermediate layer provides electrical isolation, preventing direct contact between conductive elements while still allowing the reflective coating to perform its thermal and optical functions. The mediator resolves the contradiction by enabling heat dissipation enhancement without introducing electrical shorting risks.
Solution Approach 2:
Different regions of the packaging structure are assigned different material properties: the side coating region is made insulating to prevent shorting, while the reflective coating region is made thermally conductive and optically reflective to enhance heat dissipation. This local differentiation of material qualities allows each region to optimize its specific function without compromising overall device reliability.
3Productivity
If advanced packaging designs are implemented to improve heat dissipation, then performance is maintained, but manufacturing complexity increases
Solution Approach 1:
The capillary action process allows the insulating side coating material to automatically flow and distribute itself along the side walls of the LED chip through capillary forces, without requiring complex external application equipment. This self-service mechanism simplifies the manufacturing process while achieving uniform coating coverage, making the advanced packaging design scalable for mass production.
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 effectively prolongs the lifespan of the wavelength converter by efficiently dissipating heat, reducing the likelihood of failure and maintaining performance, while ensuring electrical insulation and maximizing light emission.
Implementation Method 1
the reflective side coating provides another path for the transfer of heat from the wavelength converter to the surrounding environment
Implementation Method 2
an insulating side coating formed around the semiconductor structure
Implementation Method 3
a reflective side coating formed around the wavelength converter
Implementation Method 4
applied using a scalable and cost-efficient capillary action process
Data Source
AI summary
A light-emitting device is disclosed that includes a substrate; a semiconductor structure on the substrate, a wavelength conversion element on the substrate, opposite the semiconductor structure; an insulating side coating around the semiconductor structure; and a reflective side coating around the wavelength conversion element and the substrate, the reflective layer being stacked over the insulating side coating, the reflective side coating having a first surface that is over a second surface of the insulating side coating.