LED Light Emitting Device with Transmissive Layer for Efficiency
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Solution Overview
Problem
Current white-light emitting devices with LEDs suffer from insufficient luminous efficiency due to energy loss in wavelength conversion processes, despite the use of stacked green and red fluorescent material layers.
Innovation Solution
A light emitting device configuration that includes a light source, a first wavelength conversion portion, a light transmitting portion, and a second wavelength conversion portion, where part of the source light is directed outside without passing through the wavelength conversion portions, reducing energy loss by minimizing absorption and re-absorption of light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple wavelength conversion layers are stacked to improve color rendering, then color quality is improved, but luminous efficiency deteriorates due to repeated absorption and energy loss
Solution Approach 1:
The device segments the light path by dividing the wavelength conversion components into separate sections (first wavelength conversion portion and second wavelength conversion portion) with a light transmitting portion in between. This allows different parts of the light spectrum to be converted at different locations, reducing repeated absorption and improving overall luminous efficiency while maintaining color rendering quality.
Solution Approach 2:
The invention introduces a spatial dimension by placing the light transmitting portion between the two wavelength conversion portions, creating a three-dimensional light path structure. This dimensional arrangement allows source light to be transmitted directly through the light transmitting portion without passing through both conversion layers, thereby reducing energy loss while still enabling color conversion where needed.
2Illumination intensity
If source light passes through multiple wavelength conversion portions to achieve desired color emission, then color quality is improved, but energy loss increases
Solution Approach 1:
The light transmitting portion acts as an intermediary element between the first and second wavelength conversion portions. It allows source light and first light to pass through without significant absorption, serving as a mediator that enables direct light transmission while still permitting wavelength conversion to occur in the adjacent conversion portions where needed for color quality.
3Illumination intensity
If all source light is converted through wavelength conversion portions, then color rendering is improved, but luminous efficiency deteriorates
Solution Approach 1:
The invention applies partial wavelength conversion by allowing some source light to pass through the light transmitting portion without conversion, while other portions are converted by the wavelength conversion layers. This partial action approach maintains sufficient color rendering quality while avoiding excessive conversion that would reduce luminous efficiency.
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 enhances luminous efficiency by reducing energy loss and maintaining desired color emission, providing a light emitting device that emits light of desired color with improved efficiency.
Implementation Method 1
a first wavelength conversion portion (10) to absorb the source light (41) and to emit first light (11) having a wavelength different from a wavelength of the source light (41)
Implementation Method 2
a second wavelength conversion portion (20) to absorb at least one of the source light (41) and the first light (11) and to emit second light (21) having a wavelength different from a wavelength of the source light (41) and also different from a wavelength of the first light (11)
Implementation Method 3
a light transmitting portion (30) provided at an opposite side of the first wavelength conversion portion (10) from the light source (40) and configured to transmit the source light (41) and the first light (11)
Data Source
AI summary
A light emitting device, includes: a light source to emit source light; a first wavelength conversion portion to absorb the source light and to emit first light having a wavelength different from a wavelength of the source light; a light transmitting portion provided at an opposite side of the first wavelength conversion portion from the light source and configured to transmit the source light and the first light; and a second wavelength conversion portion provided at an opposite side of the light transmitting portion from the first wavelength conversion portion and configured to absorb at least one of the source light and the first light to emit second light having a wavelength different from the wavelength of the source light and also different from a wavelength of the first light. Part of the source light is configured to be taken to an outside of the light emitting device without passing through at least one of the first wavelength conversion portion and the second wavelength conversion portion.