Ceramic Composition Light Scattering Phase LaAlO3
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Solution Overview
Problem
Existing white LEDs with transparent resin encapsulants face issues with uniform phosphor distribution, heat resistance, and irregular color variations due to the high directivity of blue LEDs, leading to reduced internal quantum efficiency and fluorescence wavelength variations.
Innovation Solution
A ceramic composition with a light-scattering phase comprising LaAlO3 or La2O3 at 50% or more by mass, combined with a fluorescence phase, which maintains fluorescence wavelength and internal quantum efficiency while preventing irregular color variations by diffusing light into a wide viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent resin is used to encapsulate the phosphor powder, then the blue light transmission is improved, but the heat resistance deteriorates and the transmission rate decreases due to heat degeneration
Solution Approach 1:
The invention changes the material parameter from organic transparent resin to inorganic transparent ceramic. This fundamental material parameter change enables the encapsulant to withstand high temperatures without degradation, solving the heat resistance problem while maintaining optical transmission properties.
Solution Approach 2:
The invention uses a composite ceramic material comprising multiple phases (transparent phase and light-scattering phase) to achieve both optical transmission and thermal stability. The composite structure allows the material to transmit blue light effectively while resisting heat degradation.
2Illumination intensity
If a transparent resin is used to encapsulate the phosphor powder, then the blue light transmission is improved, but the manufacturing precision deteriorates due to irregular mixing and non-uniform coating thickness
Solution Approach 1:
The invention employs a composite ceramic encapsulant with integrated light-scattering particles distributed throughout the transparent matrix. This composite structure achieves uniform optical properties and consistent light scattering throughout the encapsulant, eliminating the non-uniformity issues associated with resin-based encapsulants and phosphor powder mixing.
3Stability of the object's composition
If a light-scattering phase is added to suppress irregular colors, then the color uniformity is improved, but the internal quantum efficiency deteriorates due to unintended scattering
Solution Approach 1:
The invention applies local quality by incorporating light-scattering particles specifically within the transparent ceramic encapsulant matrix, creating localized scattering centers that uniformly diffuse light without causing excessive energy loss. The scattering particles are distributed at optimal concentrations and positions to achieve color uniformity while minimizing impact on internal quantum efficiency.
Solution Approach 2:
The composite ceramic encapsulant combines a transparent phase with a light-scattering phase in specific proportions and configurations. This composite structure achieves the dual benefit of suppressing irregular colors through controlled light scattering while maintaining high internal quantum efficiency by optimizing the scattering particle characteristics and distribution.
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 ceramic composition effectively suppresses irregular colors/variation in color, maintains high optical properties, and enhances luminous efficiency by ensuring the fluorescence wavelength is preserved and internal quantum efficiency is maintained or improved.
Implementation Method 1
a ceramic composition having a light scattering function (light scattering property)... The light-scattering phase of the ceramic composition as defined in claim 1 comprises LaAlO3 or La2O3 at 50% by mass or more relative to a total amount of the light-scattering phase
Implementation Method 2
a fluorescence phase and a light-scattering phase... the fluorescence wavelength is maintained, and an intended fluorescence wavelength and a high internal quantum efficiency can be achieved
Data Source
AI summary
Provided is a ceramic composition capable of achieving a light scattering function while maintaining optical properties at a high level. The ceramic composition comprises a fluorescence phase comprising a fluorescent material and a light-scattering phase comprising a lanthanum oxide. The lanthanum oxide may be, for example, at least one selected from LaAlO3 and La2O3. The ratio of the fluorescent material (or the fluorescence phase) to the lanthanum oxide (or the light-scattering phase), the former/the latter, may be 99.9/0.1 to 50/50 in terms of volume ratio.