LED Pre-dip Material Thermal Management via Composite Additives
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Solution Overview
Problem
As LED dies become smaller to achieve cost advantages, increased current density leads to higher heat and photon densities near the light-emitting surface, causing rapid degradation of surrounding materials and reduced light output.
Innovation Solution
The use of a pre-dip material with thermally-conductive additives like alumina and cyclo-aliphatic compositions to enhance thermal conductivity and resistance to photon exposure, thereby reducing heat and photon densities and extending the life of the illumination device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the LED die size is reduced to achieve cost advantages, then the economic cost decreases, but the heat density and photon density increase causing material degradation
Solution Approach 1:
A pre-dip material is introduced as an intermediary substance between the LED die and the surrounding environment. This pre-dip material contains thermally-conductive particles that facilitate heat dissipation and protects the materials surrounding the light-emitting surface from degradation caused by high heat density and photon density, thereby resolving the contradiction between reduced LED die size and material durability
Solution Approach 2:
The pre-dip material is formulated as a composite material containing thermally-conductive particles suspended in a protective matrix. This composite structure combines the thermal management properties of the conductive particles with the protective characteristics of the matrix material, enabling simultaneous heat dissipation and protection against photon-induced degradation
2Illumination intensity
If the current density is increased to maintain light output with smaller LED dies, then the light output is maintained, but the heat density increases causing material breakdown
Solution Approach 1:
The pre-dip material acts as a thermal intermediary that conducts heat away from the high-density region near the light-emitting surface. The thermally-conductive particles in the pre-dip material create a thermal pathway that dissipates heat more effectively, allowing the LED to operate at higher current densities without causing material breakdown
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 increases the thermal conductivity and durability of the pre-dip material, maintaining desired light output and extending the life of the illumination device by distributing heat and photons more efficiently across the reflector cup, rather than just the LED die area.
Implementation Method 1
the pre-dip material may comprise one or more thermally-conductive particles that help increase the thermal conductivity of the pre-dip material
Implementation Method 2
decreasing the heat density immediately surrounding the light-emitting surface of the light source
Data Source
AI summary
An illumination device is disclosed. The illumination device includes a light source a pre-dip material that at least partially encapsulates the light source. The pre-dip material may include one or both of thermally-conductive particles and a cyclo-aliphatic composition. The pre-dip material may further include a resin and a hardener for the resin. Methods of manufacturing an illumination device are also disclosed.