Wavelength Converting Element Using Low Oxygen Diffusion Polymer
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Solution Overview
Problem
Organic phosphor materials in LED lighting systems suffer from poor photo-chemical stability, limiting their application due to sensitivity to heat and oxygen, which leads to rapid degradation and reduced lifetime.
Innovation Solution
A light-emitting device with a wavelength converting element using a polymeric carrier material with an oxygen diffusion coefficient of 8 x 10^-13 cm^2/s or less at 25°C, such as polyethylene terephthalate (PET) or its copolymers, which maintains stability and reduces degradation, allowing for improved organic phosphor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If organic phosphor materials are used in LED lighting systems, then the luminescence spectrum can be easily adjusted and transparency is improved, but photo-chemical stability deteriorates due to sensitivity to heat and oxygen
Solution Approach 1:
The patent introduces a polymeric carrier material as an intermediary between the organic phosphor and the external environment (oxygen and heat). This carrier material protects the phosphor from direct exposure to harmful factors while maintaining the phosphor's optical properties and spectrum adjustment capabilities.
Solution Approach 2:
The patent creates an inert environment by encapsulating the organic phosphor within a polymeric carrier material that has low oxygen permeability. This effectively isolates the phosphor from oxygen and reduces the impact of heat, providing protection without requiring complete vacuum or inert gas filling.
2Temperature
If organic phosphor materials are used in remote configuration devices, then heat sensitivity is reduced, but lifetime is limited due to poor photo-chemical stability
Solution Approach 1:
The polymeric carrier material serves as a protective intermediary that further isolates the organic phosphor from environmental factors. Even in remote configuration where heat exposure is reduced, the carrier material provides additional protection against oxygen and residual heat, thereby extending the phosphor's lifetime.
Solution Approach 2:
The patent uses a composite structure consisting of the polymeric carrier material and the organic phosphor material. This composite provides both mechanical protection and chemical isolation, creating a stable environment that preserves the phosphor's properties over extended periods.
3Reliability
If inorganic phosphor materials are used, then quantum efficiency is limited and emission spectrum is broad, but photo-chemical stability is improved
Solution Approach 1:
The patent employs organic phosphor materials that, while having shorter inherent lifetimes compared to inorganic phosphors, can be protected and extended in life through the polymeric carrier material. This approach allows utilization of the superior optical properties of organic phosphors with improved durability.
Solution Approach 2:
The patent changes the physical and chemical parameters of the phosphor environment by embedding it in a polymeric matrix with specific oxygen permeability characteristics. This parameter change protects the phosphor's optical properties while extending its operational life, achieving both high efficiency and improved 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 use of a polymeric carrier material with a low oxygen diffusion coefficient enhances the stability and lifetime of organic phosphor materials, achieving performance comparable to an inert atmosphere without the need for complete inert conditions, thereby improving the efficiency and longevity of LED lighting systems.
Implementation Method 1
a first organic wavelength converting material adapted to convert light of a first wavelength to light of a second wavelength
Implementation Method 2
the oxygen diffusion coefficient (D) of the polymeric carrier material is 8 x 10^-13 cm^2/s or less at 25°C
Data Source
Figure 1a~1b
Figure 1c~1d
Figure 2~3
AI summary
A wavelength converting element (101, 102, 103, 110) comprising a polymeric carrier material comprising a first wavelength converting material adapted to convert light of a first wavelength to light of a second wavelength, wherein the oxygen diffusion coefficient (D) of the polymeric carrier material is 8 x 10-13 cm2/s or less at 25°C. A prolonged lifetime of the wavelength converting material is achieved by selecting a polymeric carrier material with an oxygen diffusion coefficient (D) at 8x10-13 cm2/s or less at 25°C.