Graphene Heat Dissipation Layer for Light-Emitting Device Thermal Management
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Solution Overview
Problem
Current light-emitting devices, such as LEDs and OLEDs, suffer from poor heat dissipation due to low thermal conductivity materials like sapphire and glass, which affects luminous efficiency and lifespan, and have a low color rendering index.
Innovation Solution
A light-emitting device structure incorporating a graphene heat dissipation layer, a buffer layer, and a light emission unit with a quantum dot emissive layer and indium tin oxide transparent conductive layer, enhancing heat dissipation and color displaying performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sapphire or glass substrate is used in LED or OLED, then the device structure is stable and easy to manufacture, but the thermal conductivity is low (less than 50 W/m.K) leading to poor heat dissipation
Solution Approach 1:
The patent employs a composite substrate structure combining sapphire or glass with a graphene layer. The graphene layer provides high thermal conductivity (exceeding 50 W/m.K) while the sapphire or glass substrate maintains structural stability. This composite approach allows the device to benefit from both materials' advantages, effectively resolving the contradiction between structural stability and heat dissipation performance.
2Device complexity
If blue LED with yellow YAG fluorescent powder is used, then the device structure is simple, but the color rendering index is low
Solution Approach 1:
The patent introduces quantum dot layers at specific locations within the LED structure, particularly in the light emission path. These quantum dots provide localized wavelength conversion with high color purity, enabling superior color rendering (Ra>95, R9>90) while maintaining relative structural simplicity. The quantum dots are strategically positioned to convert blue light to specific wavelengths, improving color quality without requiring complete restructuring of the LED.
3Ease of manufacture
If conventional substrate materials are used, then the manufacturing process is established and simple, but the service life is limited due to poor heat dissipation
Solution Approach 1:
The graphene layer serves as an intermediary thermal management component between the LED chip and the sapphire or glass substrate. It acts as a thermal interface material that efficiently conducts heat away from the LED chip while maintaining the ease of manufacturing associated with conventional sapphire or glass substrates. This intermediary layer extends device service life by improving heat dissipation without complicating the manufacturing process.
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 graphene heat dissipation layer effectively reduces the temperature of the device, extends its service life, and improves color saturation and displaying performance, particularly for LEDs.
Implementation Method 1
The heat dissipation layer is made of graphene
Implementation Method 2
The emissive layer is a quantum dot emissive layer
Data Source
AI summary
The present invention provides a light-emitting device and a manufacturing method thereof. The light-emitting device includes: a heat dissipation layer (2), a buffer layer (4) formed on the heat dissipation layer (2), and a light emission unit (6) formed on the buffer layer (4). The heat dissipation layer (2) is made of graphene. The manufacturing method of a light-emitting device according to the present invention makes use of a graphene-made heat dissipation layer to effectively dissipate away heat emitting from the emissive layer of the light emission unit so as to effectively reduce the temperature of the light-emitting device and extend the service life of the light-emitting device. Particularly, when the light-emitting device is a light-emitting diode, the emissive layer thereof is a quantum dot emissive layer for effectively improving color saturation of the light-emitting diode and enhancing color displaying performance of the light-emitting diode.