Dual-Channel Heat-Conducting Encapsulation for LED Thermal Management
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Solution Overview
Problem
High-power LED light sources experience rapid junction temperature increases due to heat accumulation, leading to attenuation and reduced service life when using traditional encapsulation methods with fluorescent organic colloid, which is inadequate for heat conduction.
Innovation Solution
A dual-channel heat-conducting encapsulation structure for solid-state phosphor integrated light sources, featuring heat-conducting columns that separate and effectively conduct heat away from LED chips and phosphor, using transparent organic silica gel to isolate the phosphor and substrate, while maintaining high transmittance and reflectivity for light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transparent organic silica gel is used to isolate solid-state phosphor from LED chips, then heat superposition is prevented, but heat conduction is insufficient
Solution Approach 1:
The encapsulation structure is divided into distinct functional regions: an isolation layer (transparent organic silica gel) to prevent heat superposition, and heat-conducting columns (made of materials like aluminum nitride or silicon carbide) to provide dedicated heat conduction pathways. This segmentation allows each component to perform its specific function optimally without interference.
Solution Approach 2:
Heat-conducting columns are introduced as intermediary structures between the LED chips and the heat dissipation system. These columns act as thermal bridges that efficiently conduct heat away from the LED chips and solid-state phosphor without requiring direct contact between the phosphor and chips, thus maintaining both isolation and effective heat conduction.
2Power
If power density is increased to improve luminous output, then luminous efficiency increases, but junction temperature rises rapidly
Solution Approach 1:
The patent transitions from a single-plane encapsulation structure to a three-dimensional heat management architecture with heat-conducting columns extending vertically from the substrate. This dimensional change creates additional heat conduction pathways that efficiently manage thermal loads at high power densities without compromising junction temperature.
Solution Approach 2:
The encapsulation structure employs composite materials with different thermal properties: transparent organic silica gel for electrical isolation and moderate thermal management, and high-thermal-conductivity materials (aluminum nitride, silicon carbide) for the heat-conducting columns. This composite approach enables simultaneous achievement of electrical isolation and efficient heat conduction at high power densities.
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 dual-channel heat-conducting design significantly reduces the temperature of both LED chips and solid-state phosphor, increasing their service life and maintaining luminous efficiency, as demonstrated by reduced temperature and improved performance in tests.
Implementation Method 1
heat-conducting columns that separate and effectively conduct heat away from LED chips and phosphor
Implementation Method 2
transparent organic silica gel to isolate the phosphor and substrate
Implementation Method 3
the solid-state phosphor has the fluorescence effect of absorbing visible lights in the range of 400-500 nm or ultraviolet lights in the range of 250-400 nm, and exciting beams in the visible light band of 380-780 nm
Data Source
AI summary
A dual-channel heat-conducting encapsulation structure of a solid-state phosphor integrated light source has a solid-state phosphor, a transparent organic silica gel, LED chips and a substrate. The LED chips are arranged on the substrate. The dual-channel heat-conducting encapsulation structure also has heat-conducting columns fixed on the substrate, and the heat-conducting columns are disposed away from the LED chips; the solid-state phosphor is placed on the heat-conducting columns without contacting the LED chips; the transparent organic silica gel is filled in the gap between the solid-state phosphor and the substrate. By adopting the design of double heat-conducting channels, separates two heat sources of the LED light source to sufficiently conduct the heat, the heat of the solid-state phosphor and the LED chips reaches the substrate through the respective channels, and then is transferred from the substrate through the heat sink into the atmosphere.