LED Wavelength Conversion Structure with Dual Reflectors
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Solution Overview
Problem
The luminous efficiency of light-emitting diodes (LEDs) combined with phosphor in lighting applications is not as expected, necessitating an improvement in the luminous efficiency of phosphor used in light-emitting devices.
Innovation Solution
A light-emitting device design incorporating a light-emitting unit, a transparent covering structure, a first reflective structure, a second reflective structure, and a wavelength conversion structure, where the reflective structures surround the light-emitting unit and the transparent covering structure, and the wavelength conversion structure is disposed on both, to enhance light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional LED combined with phosphor is used for lighting applications, then the device structure is simple, but the luminous efficiency is not as expected
Solution Approach 1:
The patent divides the light extraction path into multiple segments: light from the LED chip is reflected by the first reflective structure (surrounding the LED), then reflected again by the second reflective structure (under the LED), before reaching the wavelength conversion structure. This segmentation of the optical path increases the probability of light extraction and improves luminous efficiency without significantly complicating the manufacturing process
Solution Approach 2:
The patent introduces a three-dimensional reflective structure configuration where the first reflective structure is disposed around the light-emitting unit and the second reflective structure is disposed under the light-emitting unit. This spatial arrangement in multiple dimensions enhances light extraction efficiency by utilizing both lateral and vertical reflection paths, improving luminous efficiency while maintaining reasonable structural simplicity
2Loss of energy
If a reflective structure is added to improve light extraction, then the luminous efficiency is improved, but the device complexity increases
Solution Approach 1:
The reflective structures serve multiple functions simultaneously: they reflect light to improve extraction efficiency, they provide a mounting structure for the wavelength conversion material, and they help define the optical path geometry. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving improved 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
The design improves luminous efficiency, lighting field, and color temperature by reflecting light from the light-emitting unit towards the transparent covering structure for conversion, resulting in a more efficient light-emitting device with enhanced optic characteristics.
Implementation Method 1
The first reflective structure surrounds the transparent covering structure. The second reflective structure is disposed under the first reflective structure and surrounds the first conductive electrode and the second conductive electrode
Implementation Method 2
The wavelength conversion structure is disposed on the first reflective structure and the transparent covering structure
Data Source
AI summary
An embodiment of present disclosure discloses a light-emitting device which includes a light-emitting unit, a transparent covering structure, a first reflective structure, a second reflective structure, and a wavelength conversion structure. The light-emitting unit includes a light-emitting surface, a bottom surface opposite to the light-emitting surface, a side surface, a first conductive electrode, and a second conductive electrode. The first conductive electrode and the second conductive electrode are located on the bottom surface. The transparent covering structure covers the light-emitting surface and the side surface. The first reflective structure surrounds the transparent covering structure. The second reflective structure is disposed under the first reflective structure and surrounds the first conductive electrode and the second conductive electrode. The wavelength conversion structure is disposed on the first reflective structure and the transparent covering structure.