LED Light Conversion Structure for Thermal Decoupling
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Solution Overview
Problem
Conventional LEDs require a large number of units to achieve sufficient lumen flux due to incoherent light emission, and close packing is impractical due to heat issues, limiting the ability to concentrate light optically.
Innovation Solution
A light-emitting device comprising at least one LED emitting in the 220-550 nm range, combined with a conversion structure that converts light without optical contact, featuring a refractive index of 1.5-3 and a surface area ratio of 2:1 to 50,000:1, equipped with refractive and diffractive structures to enhance light concentration and thermal decoupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple LEDs are closely packed to achieve sufficient lumen flux, then the light output increases, but heat dissipation becomes problematic and optical concentration becomes difficult
Solution Approach 1:
The patent introduces a conversion structure as an intermediary element between the LED array and the external environment. This conversion structure serves multiple functions: it converts the incoherent light from multiple LEDs into a more concentrated form, manages the thermal load by providing a thermal pathway separate from the optical path, and enables optical concentration without requiring the LEDs to be in direct contact. The conversion structure acts as a mediator that decouples the thermal and optical management requirements.
2Temperature
If LEDs are arranged with sufficient spacing for heat dissipation, then thermal management improves, but the device volume increases and light concentration becomes difficult
Solution Approach 1:
The patent merges multiple functions into the conversion structure: light conversion, thermal management interface, and optical concentration element. By combining these functions into a single integrated component, the system achieves effective heat dissipation without requiring increased spacing between LEDs, thereby maintaining a compact device volume. The conversion structure serves as a shared platform that simultaneously addresses thermal and optical requirements.
3Illumination intensity
If conventional optical means like mirrors are used to concentrate LED light, then light concentration is attempted, but it is not effective due to the incoherent nature of LED emission
Solution Approach 1:
The patent changes the fundamental parameter of light coherence by using a conversion structure that transforms incoherent LED emission into a more concentrated, quasi-coherent output. This parameter change occurs through the conversion process within the structure, which modifies the optical properties of the light without requiring complex optical systems. The conversion structure inherently performs the concentration function through its design, eliminating the need for additional mirrors or complex optical components.
4Productivity
If a large number of LEDs are used to replace halogen lamps, then sufficient lumen flux is achieved, but the device complexity and volume increase
Solution Approach 1:
The patent merges the functions of multiple LEDs into a single conversion structure that handles the light from the LED array. Instead of treating each LED as a separate optical unit requiring individual management, the conversion structure consolidates the optical processing for all LEDs into one integrated component. This merging reduces the overall system complexity while maintaining the high lumen flux output required to replace halogen lamps.
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
This configuration achieves high luminance and light flux from a small volume, maintaining efficiency across a broad temperature range and suitable for various applications.
Implementation Method 1
at least one conversion structure placed towards the at least one LED without optical contact, which converts at least partly the light from the at least one LED to light in the wavelength range of ≧300 nm to ≦1000 nm
Implementation Method 2
the at least one entrance surface has a roughness Ra of ≧1 nm and ≦500 nm, preferably ≧10 nm and ≦100 nm and more preferably ≧20 nm and≦40 nm. By virtue thereof, it is possible indeed to concentrate light at the exit surface E of the light conversion structure.
Implementation Method 3
the at least one exit surface is equipped, according to a preferred embodiment of the present invention, with a refractive and/or diffractive structure or surface. This means that the at least one exit surface is equipped with a scattering structure 200a, a pyramid-like structure 200b, a microlens structure 200c or a compound parabolic concentrator (CPC) 200d
Data Source
AI summary
The invention relates to a light-emitting device comprising a conversion structure and one or several LEDs (40), which emit light into the conversion structure. The light is then converted and emitted with a high radiant flux.