Manganese-Activated Fluoride Phosphor Localization in Light Emitting Devices
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Solution Overview
Problem
The fluoro complex phosphor in existing semiconductor light emitting devices has poor resistance to environmental factors, leading to degradation and reduced reliability of the light emitting device when used as the outermost layer.
Innovation Solution
A light emitting device design featuring a light transmissive member with a manganese-activated fluoride phosphor, where the wavelength conversion substances are localized to reduce exposure and degradation, and a cover member to protect against external environments, ensuring the phosphor's emission efficiency and longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the fluoro complex phosphor is used as the outermost layer to achieve wavelength conversion, then the light emitting device can emit the desired spectrum, but the phosphor degrades easily due to poor environmental resistance
Solution Approach 1:
A protective coating layer is applied over the fluoro complex phosphor to act as an intermediary barrier between the phosphor and the external environment. This coating protects the phosphor from moisture and oxygen while allowing light to pass through, thus maintaining wavelength conversion efficiency while improving durability.
Solution Approach 2:
The fluoro complex phosphor is sealed in an inert atmosphere or encapsulated in a protective housing that excludes moisture and oxygen. This creates a chemically stable environment that prevents degradation of the phosphor while maintaining its optical properties for wavelength conversion.
2Device complexity
If the phosphor is exposed to the external environment for light emission, then the device structure remains simple, but the phosphor degrades due to environmental factors
Solution Approach 1:
A thin flexible protective film or coating is applied directly over the phosphor layer. This thin barrier provides environmental protection while maintaining optical transparency and adding minimal structural complexity to the device.
Solution Approach 2:
The phosphor is integrated into a composite material matrix or protective encapsulant that provides environmental resistance. This composite structure protects the phosphor from degradation while maintaining the overall simplicity of the device design.
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 enhances the reliability and reduces degradation of the manganese-activated fluoride phosphor, maintaining emission efficiency and extending the device's lifespan.
Implementation Method 1
wavelength conversion substances contained in the base material to absorb the light from the light emitting element and emit light
Implementation Method 2
wavelength conversion substances contained in the base material to absorb the light from the light emitting element and emit light
Data Source
AI summary
A light emitting device is provided. The light emitting device includes a light emitting element, which emits blue light, and a light transmissive member having a first principal face bonded to the light emitting element and a second principal face opposite the first principal face. The light transmissive member has a light transmissive base material and wavelength conversion substances, which are contained in the base material and which absorb the light from the light emitting element and emit light. The wavelength conversion substances are localized in the base material towards the first principal face, and include a first phosphor which emits green to yellow light and a second phosphor which emits red light. The first phosphor is more localized towards the first principal face than the second phosphor. The second phosphor is a manganese-activated fluoride phosphor.