LED with Photonic Crystal and Diffuser for Illumination
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Solution Overview
Problem
Conventional light-emitting diodes with photonic crystals on their surfaces excel in perpendicular light emission, making it difficult to achieve diffused light suitable for indoor illumination, limiting their application in illumination systems.
Innovation Solution
A light-emitting device with a dielectric constant periodically modulated on a plane parallel to its surface and a diffusing member on the side, such as a plano-concave lens or convex mirror, to parallelize and diffuse light emitted perpendicularly, enhancing light extraction efficiency and achieving diffused light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a photonic crystal is mounted on the light-emitting surface of a light-emitting diode to improve light extraction efficiency, then light extraction efficiency is improved, but the light emission becomes perpendicular and diffused light suitable for indoor illumination cannot be obtained
Solution Approach 1:
The light-emitting device is divided into two functional parts: a light-emitting diode with photonic crystal for perpendicular light emission and high extraction efficiency, and a separate diffusing member for converting the perpendicular light into diffused light. This segmentation allows each component to optimize its specific function while working together to achieve the overall goal of providing both high efficiency and suitable illumination characteristics.
Solution Approach 2:
A diffusing member is introduced as an intermediary component between the light-emitting diode and the illumination target. This intermediary converts the perpendicular light from the LED into diffused light, enabling the system to maintain high light extraction efficiency while providing light suitable for indoor illumination applications.
2Productivity
If the light-emitting diode emits light perpendicularly to the light-emitting surface to achieve high extraction efficiency, then light extraction efficiency is improved, but it is difficult to obtain diffused light
Solution Approach 1:
The lighting system is segmented into a light-generating component (LED with photonic crystal) that produces perpendicular light for high extraction efficiency, and a light-modifying component (diffusing member) that transforms the light pattern into diffused emission. This functional segmentation resolves the contradiction between extraction efficiency and light diffusion pattern.
Solution Approach 2:
The solution transitions from a single-dimension perpendicular light emission to multi-directional diffused light emission by introducing a diffusing member. This dimensional transformation allows the system to maintain the efficient perpendicular emission mechanism while achieving the desired diffused light pattern for illumination applications.
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 significantly improves light extraction efficiency and allows for the emission of diffused light, making the device suitable for illumination applications by parallelizing and diffusing light emitted perpendicularly, thereby increasing the intensity and coverage of the emitted light.
Implementation Method 1
a portion, formed on a plane substantially parallel to a light-emitting surface of the light-emitting diode, having a dielectric constant periodically modulated with respect to the in-plane direction of the plane substantially parallel to the light-emitting surface
Implementation Method 2
a member provided on the side of the light-emitting surface of the light-emitting diode for diffusing light emitted from the light-emitting diode
Data Source
AI summary
A light-emitting device, having high light extraction efficiency, capable of obtaining diffused light is obtained. This light-emitting device comprises a light-emitting diode, a portion, formed on a plane substantially parallel to a light-emitting surface of the light-emitting diode, having a dielectric constant periodically modulated with respect to the in-plane direction of the plane substantially parallel to the light-emitting surface and a member provided on the side of the light-emitting surface of the light-emitting diode for diffusing light emitted from the light-emitting diode.