Wavelength Conversion Lens with Phosphor and Emulsifier Particles
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Solution Overview
Problem
Existing LED lighting systems face challenges in achieving uniform light wavelength conversion from violet, blue, and cyan excitation to broad spectrum light due to scattering issues with phosphor particles, which affect optical distribution and color uniformity, particularly in applications requiring high color uniformity like automotive lighting.
Innovation Solution
A wavelength conversion device comprising a trillion-shaped LED chip with a conformal phosphor coating and an optically coupled lens containing phosphor particles, emulsifier particles, and quantum dots, which improves light extraction and distribution control through precise shaping and refractive index modification, enabling uniform wavelength conversion and high color rendition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If phosphor particles are used for wavelength conversion, then broad spectrum light can be produced, but light scattering occurs which degrades optical distribution control and color uniformity
Solution Approach 1:
A lens is introduced as an intermediary component between the LED chip and the phosphor particles. The lens pre-distributes and collimates the blue light from the LED chip before it reaches the phosphor conversion layer, reducing random scattering and improving optical distribution control while maintaining broad spectrum output.
Solution Approach 2:
The refractive index of the lens material is specifically selected and optimized to match and manage the optical properties of the phosphor particles. By controlling the refractive index parameter, the system minimizes scattering effects at interfaces while maintaining efficient wavelength conversion.
2Quantity of substance
If phosphor particles are used for wavelength conversion, then broad spectrum light can be produced, but color uniformity deteriorates
Solution Approach 1:
The lens performs preliminary optical conditioning by collimating and distributing the LED chip output before the light reaches the phosphor particles. This pre-distribution ensures uniform illumination across the phosphor layer, leading to consistent color output and uniformity across the illuminated area.
Solution Approach 2:
The refractive index of the lens is optimized to control light paths through the phosphor layer, ensuring uniform interaction between the blue pump light and phosphor particles. This parameter control enables consistent wavelength conversion and color uniformity across the entire optical output.
3Object-affected harmful factors
If a lens with refractive index matching is used, then light distribution control improves, but device complexity increases
Solution Approach 1:
The wavelength conversion function and the light distribution control function are merged into a single integrated lens component. The lens simultaneously performs collimation, refractive index matching, and scattering control, eliminating the need for separate optical components and reducing overall device complexity.
Solution Approach 2:
The lens is designed as a multi-functional optical element that performs multiple roles: it acts as a collimating lens, a refractive index matching layer, and a scattering control mechanism all in one component. This universality simplifies the optical system while achieving multiple performance goals.
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 achieves improved light uniformity and efficiency by reducing scattering and enhancing light distribution control, resulting in high color uniformity and luminous efficacy, suitable for automotive and other applications requiring precise illumination.
Implementation Method 1
the phosphor is what makes LED light usable... the blue light produced is not usable for many lighting applications and can be covered with a phosphor, which absorbs the blue emission from the LED and re-emits light at longer wavelengths
Implementation Method 2
A lens is optically coupled with the LED chip and including phosphor particles, emulsifier particles, and lens shaping particles each immersed within the lens... a lens with refractive index matching is used, then light distribution control improves
Data Source
AI summary
A wavelength conversion device includes an LED chip. A PCB solder mask defines an opening at least partially encompassing the LED chip. A lens is optically coupled with the LED chip and includes phosphor particles, emulsifier particles, and lens shaping particles each immersed within the lens. In various instances, the wavelength conversion device may be operably coupled with a vehicle to form various light effects.