Single Crystal Phosphor Plate for High-Power LED Thermal Stability
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Solution Overview
Problem
High-powered light emitting devices face issues with heat generation and variations in light emission characteristics due to temperature increases, affecting both the light emitting element and phosphor properties.
Innovation Solution
A plate-shaped transparent member composed of granular-shaped single crystal phosphors with excellent quantum efficiency and temperature quenching characteristics, manufactured using methods like the Czochralski Method, is used in light emitting devices to minimize emission spectrum variation and maintain brightness across a wider temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-powered light emitting devices are used to increase brightness and output, then light emission intensity is improved, but heat generation increases causing temperature rise
Solution Approach 1:
The patent changes the material parameter from conventional phosphor to single crystal phosphor, which fundamentally alters the temperature quenching characteristics and maintains quantum efficiency across a wider temperature range, resolving the contradiction between high output and heat management
2Illumination intensity
If conventional phosphor is used in high-powered devices, then initial brightness is achieved, but quantum efficiency decreases due to temperature quenching
Solution Approach 1:
The patent changes the phosphor material parameter to single crystal structure, which fundamentally improves temperature quenching characteristics and maintains quantum efficiency at high temperatures, resolving the contradiction between brightness and energy efficiency
3Device complexity
If standard phosphor materials are used, then device simplicity is maintained, but emission spectrum varies significantly with temperature
Solution Approach 1:
The patent changes the phosphor material parameter to single crystal structure, which fundamentally stabilizes the emission spectrum across temperature variations while maintaining device simplicity, resolving the contradiction between simplicity and spectral stability
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 provides light emitting devices with higher brightness, reduced temperature-dependent fluorescence intensity loss, and smaller characteristics variations, enabling higher output and longer lifespan.
Implementation Method 1
a phosphor configured to emit a fluorescent light by receiving an excitation light so as to be excited
Implementation Method 2
manufactured using methods like the Czochralski Method
Data Source
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AI summary
One purpose of the invention is to provide a phosphor with excellent quantum efficiency, a method for manufacturing the same, and a light-emitting device that uses this phosphor. One embodiment provides a phosphor comprising monocrystals with YAG crystals as a matrix, the quantum efficiency of the phosphor at 25°C being 92% or higher at an excitation light wavelength of 460 nm.