Light Emitting Device with Integrated Wavelength Conversion and Extraction
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Solution Overview
Problem
Current light emitting devices face inefficiencies in extracting light from a laser element incident on a phosphor-containing member, leading to significant light loss within the package.
Innovation Solution
A light emitting device configuration featuring a support member with a base and cap, including a light extraction window, a semiconductor laser element, a light reflecting member positioned to reflect light toward the extraction window, and a wavelength conversion member with a support surface and light incidence surface, where part of the wavelength conversion member is fitted into the extraction window, enhancing light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If light is emitted from a semiconductor laser element and incident on a wavelength conversion member, then wavelength conversion occurs, but light loss within the package increases due to inefficient light extraction
Solution Approach 1:
The wavelength conversion member is integrated with the light extraction window, forming a unified structure where the light extraction function and wavelength conversion function are combined. This eliminates the need for separate extraction optics and reduces light loss at multiple interfaces.
Solution Approach 2:
The invention utilizes the side surface of the wavelength conversion member as both a light extraction surface and a support surface for the light reflecting member. By extracting light from the side dimension rather than only from the top surface, the patent creates additional light extraction pathways and improves overall extraction efficiency.
2Productivity
If a light reflecting member is added to reflect light toward the extraction window, then light extraction efficiency improves, but device complexity increases
Solution Approach 1:
The light reflecting member is integrated with the wavelength conversion member, with the reflecting member's support surface becoming part of the wavelength conversion member's structure. This merging reduces the number of discrete components and simplifies assembly while maintaining the light reflection function.
Solution Approach 2:
The wavelength conversion member serves multiple functions: wavelength conversion, light extraction (through the integrated extraction window), and structural support (through the integrated support surface for the reflecting member). This multi-functionality reduces overall device complexity.
3Reliability
If multiple separate components are used for light extraction and wavelength conversion, then functional performance is achieved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple functions (wavelength conversion, light extraction, and structural support) into integrated components, reducing the total number of parts that need to be manufactured, handled, and assembled. This integration directly reduces manufacturing cost while maintaining functional performance.
4Productivity
If additional optical components are added to improve light extraction, then light extraction efficiency improves, but device size increases
Solution Approach 1:
By integrating the light extraction window directly into the wavelength conversion member, the patent eliminates the need for separate extraction optics and associated mounting structures, thereby improving light extraction efficiency without increasing device size.
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 improves light extraction efficiency, reduces heat dissipation concerns, allows for a more compact design by eliminating the need for additional optical components, and lowers manufacturing costs by simplifying the device structure.
Implementation Method 1
a light reflecting member disposed in the space at a position where light from the semiconductor laser element is reflected toward the light extraction window
Implementation Method 2
a wavelength conversion member disposed between the semiconductor laser element and the light reflecting member
Data Source
AI summary
A light emitting device includes a support member, a semiconductor laser element, a light reflecting member, and a wavelength conversion member. The support member has a base and a cap that includes a light extraction window from which light is extracted upward. The semiconductor laser element is disposed within a space defined by the base and the cap. The light reflecting member is disposed in the space at a position where light from the semiconductor laser element is reflected toward the light extraction window. The wavelength conversion member is disposed between the semiconductor laser element and the light reflecting member, and includes a support surface that supports the light reflecting member, and a light incidence surface on which the light emitted by the semiconductor laser element is incident. Part of the wavelength conversion member is fitted into the light extraction window.