Fluorescent Glue with Heat Radiation Material for LED Thermal Management
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Solution Overview
Problem
Existing LED lighting technologies face challenges with heat dissipation, particularly in 4π light-emitting configurations, where heat dissipation is poor and limited to 2π light-emitting designs, leading to reduced reliability and luminous efficiency due to increased junction temperatures affecting both LED chips and phosphors.
Innovation Solution
A fluorescent glue for LED lighting bars and bulbs comprising a phosphor, a heat radiation material with a refractive index greater than 1.4 and heat emissivity greater than 0.8, and a colloid, which converts heat into infrared waves for efficient radiation dissipation without additional heat dissipation devices, allowing for 4π light emission and improved luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional fluorescent glue is used in LED lighting bars, then the phosphor can be excited by LED light to emit long-wavelength light, but the heat dissipation performance is poor and junction temperature increases significantly
Solution Approach 1:
The patent uses a composite fluorescent glue comprising phosphor particles, heat radiation material particles (with refractive index >1.4 and heat emissivity >0.8), and colloid. This composite structure enables simultaneous phosphor excitation for light emission and heat radiation for thermal management, resolving the contradiction between maintaining phosphor functionality and improving heat dissipation.
Solution Approach 2:
The fluorescent glue is designed to perform multiple functions: (1) phosphor excitation to convert short-wavelength LED light to long-wavelength light, (2) heat radiation through materials with high heat emissivity (>0.8), and (3) light transmission with reduced reflection due to high refractive index (>1.4). This multi-functionality allows a single component to address both optical conversion and thermal management needs.
2Ease of manufacture
If heat radiation material with high refractive index is added to fluorescent glue, then heat dissipation and light transmission are improved, but the manufacturing complexity increases
Solution Approach 1:
The patent combines phosphor particles, heat radiation material particles, and colloid into a single homogeneous fluorescent glue composition. By merging these functional materials into one applicatable mixture, the patent simplifies the manufacturing process while maintaining the complex functional properties of heat radiation and light transmission enhancement.
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 provides effective heat dissipation and high luminous efficiency by converting heat into infrared waves, enhancing the heat dissipation performance of LED lighting bars and bulbs, addressing the limitations of existing technologies in both 2π and 4π light-emitting designs.
Implementation Method 1
a heat radiation material with a refractive index greater than 1.4 and a heat emissivity greater than 0.8... converts heat into infrared waves for efficient radiation dissipation
Implementation Method 2
a phosphor... a phosphor is excited by short-wavelength light emitted from LEDs to emit long-wavelength light
Data Source
AI summary
Disclosed is a fluorescent glue for an LED lighting bar, and an LED bulb lamp, the fluorescent glue comprises a phosphor, a heat radiation material having a refractive index larger than 1.4 and a heat emissivity larger than 0.8, and a colloid, the heat radiation material accounts for 0.5% to 10% by weight of the fluorescent glue, the phosphor accounts for 25% to 45% by weight of the fluorescent glue, and the colloid accounts for 45% to 74.5% by weight of the fluorescent glue. The fluorescent glue combined with the heat radiation material can directly convert heat generated by an LED chip and the fluorescent glue into infrared waves that are radiated into the surrounding environment, without additionally providing a heat dissipating device or spraying a heat dissipating coating.