Persistent Phosphor Blends for Emergency Device Visibility
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Solution Overview
Problem
Current persistent phosphors suffer from poor light duration, low light emission, and ineffectiveness in certain color ranges, making them unsuitable for various applications.
Innovation Solution
Development of novel persistent phosphor blends integrated into structures, such as security and fire system devices, using specific phosphor compositions like M1F2-M1S:EU2+, Ln3+ and Ax-y-zAl2-m-n-o-pO4:Euy, REz, Bm, Znn, Coo, Scp, where the excitation spectrum of one phosphor overlaps with the emission spectrum of another, enhancing light emission and persistence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If current persistent phosphors are used, then the structure can display phosphorescent properties, but the light duration is poor and light emission is low
Solution Approach 1:
The patent applies composite materials by combining multiple phosphor compounds with different persistence characteristics into a single phosphor blend. This composite approach allows the system to achieve both long light duration and adequate emission intensity by leveraging the complementary properties of individual phosphors within the blend formulation.
Solution Approach 2:
The patent employs parameter changes by systematically adjusting the chemical composition ratios, particle size distributions, and excitation wavelength parameters of the phosphor blend. These parameter optimizations enable tuning of both the duration and intensity of phosphorescent emission to simultaneously satisfy conflicting performance requirements.
2Adaptability or versatility
If current persistent phosphors are used, then the phosphor can be applied to structures, but the phosphors are ineffective in certain color ranges
Solution Approach 1:
The patent uses composite materials by formulating phosphor blends that incorporate multiple phosphor compounds each contributing different color emissions. This composite strategy enables the system to achieve broad spectral coverage and reliable effectiveness across diverse color ranges that individual phosphors cannot accomplish alone.
Solution Approach 2:
The patent applies universality by designing a phosphor blend system that can reliably produce multiple color outputs through selective excitation. The multi-functional blend formulation allows the same material composition to effectively serve various color requirements, enhancing adaptability across different application scenarios.
3Illumination intensity
If phosphor blends with overlapping excitation and emission spectra are used, then light emission and persistence are enhanced, but the device complexity increases
Solution Approach 1:
The patent applies parameter changes by systematically optimizing the spectral overlap parameters between phosphor components. By carefully selecting phosphors with specific excitation and emission wavelength characteristics, the system achieves enhanced light emission through controlled spectral interactions while managing the complexity of the blend composition.
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 phosphor blends provide longer persistence and tunable color, enabling effective identification and location of safety and security hardware in low light situations, particularly in emergency scenarios where power is lost.
Implementation Method 1
persistent phosphors are known, current art suffers from several shortcomings including, for example, poor light duration from the phosphor
Implementation Method 2
the excitation spectrum of one phosphor overlaps with the emission spectrum of another, enhancing light emission and persistence
Data Source
AI summary
An article of manufacture that comprises a structure that is a security system device (or portion thereof) or a fire system device (or portion), where a persistent phosphor and/or a persistent phosphor blend is either integrated in a coating on the structure; applied on the structure; or integrated in the structure, wherein the persistent phosphor comprises certain phosphors or phosphor blends. The present invention has been described in terms of specific embodiment(s), and it is recognized that equivalents, alternatives, and modifications, aside from those expressly stated, are possible and within the scope of the appending claims.