Light Emitting Device With Titanium Dioxide Sealing Resin
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Light-emitting devices that emit short-wavelength light, such as those used in streetlights, can attract sea turtles and are difficult to manufacture without significant increases in cost or decreases in luminous flux when attempting to attenuate these wavelengths.
Innovation Solution
A light-emitting device with LED elements emitting blue light and a sealing resin containing phosphor and titanium-dioxide particles, where the phosphor particles are excited to emit yellow light, mixing with blue light to produce white light, and titanium-dioxide particles attenuate short-wavelength light, maintaining a low intensity ratio of wavelengths 560 nm or less to all emitted light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an optical filter is used to remove short-wavelength light, then the harmful effect on sea turtles is reduced, but the manufacturing cost increases and luminous flux is attenuated
Solution Approach 1:
The patent replaces expensive optical filters with a cost-effective sealing resin containing phosphor and titanium-dioxide particles. The resin achieves wavelength attenuation through material composition rather than requiring additional filter components, significantly reducing manufacturing cost while maintaining the function of reducing short-wavelength light emission.
Solution Approach 2:
The sealing resin is formulated as a composite material containing phosphor particles and titanium-dioxide particles dispersed in a resin matrix. This composite structure enables the resin to simultaneously perform sealing, wavelength conversion, and selective light attenuation functions, eliminating the need for separate optical filter components and reducing overall device complexity and cost.
2Object-affected harmful factors
If an optical filter is used to remove short-wavelength light, then the harmful effect on sea turtles is reduced, but the luminous flux is attenuated
Solution Approach 1:
The patent applies selective attenuation properties locally within the sealing resin by dispersing titanium-dioxide particles that specifically target short-wavelength light while allowing longer wavelengths to pass through. This localized wavelength-selective interaction reduces harmful short-wavelength emission without significantly attenuating the overall luminous flux, as the attenuation is concentrated in the problematic wavelength range only.
Solution Approach 2:
The patent changes the physical and chemical parameters of the sealing resin by incorporating phosphor and titanium-dioxide particles with specific properties. The phosphor particles convert blue light to yellow light, while the titanium-dioxide particles provide wavelength-dependent attenuation. These parameter changes enable the resin to selectively modify the spectral composition of emitted light, reducing short-wavelength content while preserving overall luminous output.
3Object-affected harmful factors
If phosphor particles are dispersed in sealing resin, then short-wavelength light is attenuated, but the manufacturing complexity increases
Solution Approach 1:
The patent merges multiple functions into a single sealing resin component: sealing protection, wavelength conversion via phosphor, and selective light attenuation via titanium-dioxide particles. By combining these functions in one integrated material rather than using separate components, the overall device complexity is reduced despite the enhanced composition of the resin itself.
Solution Approach 2:
The sealing resin is designed as a multi-functional material that simultaneously performs sealing, optical filtering, and wavelength conversion. This universal approach eliminates the need for multiple separate components (sealing resin + optical filter + phosphor layer), simplifying the overall device structure and reducing manufacturing complexity despite the sophisticated composition of the resin.
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 effectively attenuates short-wavelength light with minimal increase in manufacturing cost and luminous flux loss, ensuring the intensity ratio of light 560 nm or less is less than 10%, meeting regulatory requirements for sea turtle conservation.
Implementation Method 1
phosphor particles being excited by the first light to emit second light. The first light and the second light are mixed and emitted as white light
Implementation Method 2
transmitting through the sealing resin causes the first light to be attenuated more than the second light by the titanium-dioxide particles
Data Source
AI summary
Provided is a light-emitting device wherein short-wavelength light included in emitted white light is attenuated with a small increase in manufacturing cost and a small decrease in luminous flux. The light-emitting device includes a mount board, LED elements mounted on the mount board and emitting first light which is blue light or has a shorter wavelength than blue light, and a sealing resin containing phosphor particles and titanium-dioxide particles and filled on the mount board to integrally seal the LED elements, the phosphor particles being excited by the first light to emit second light. The first light and the second light are mixed and emitted as white light, and transmitting through the sealing resin causes the first light to be attenuated more than the second light by the titanium-dioxide particles.