Jumbo Phosphor Blend Dual Layer Fluorescent Lamp Efficacy
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Solution Overview
Problem
The industry trend of using smaller rare earth phosphors in fluorescent lamps to reduce powder weight has not effectively led to higher efficacy light sources, which are necessary to reduce energy consumption and greenhouse gas emissions, as smaller phosphors limit the achievable lumens per watt (LPW) and overall energy efficiency.
Innovation Solution
Employing very large particle size rare earth phosphors, referred to as Jumbo phosphors, in a dual layer configuration within fluorescent lamps to enhance efficacy, with a phosphor blend consisting of red, green, and blue emitting phosphors sized between 12 to 15 μm, which increases lumens per watt and overall light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If smaller phosphor particles are used, then powder weight is reduced, but lamp efficacy (lumens per watt) decreases
Solution Approach 1:
The patent changes the particle size parameter of phosphors to very large sizes (12-15 μm 50% size), which is the opposite of the industry trend. This parameter change resolves the contradiction by demonstrating that larger particles actually improve lamp efficacy while the dual-layer configuration optimizes the distribution to manage powder weight effectively
Solution Approach 2:
The patent divides the phosphor coating into two separate layers applied to the bulb interior. This segmentation allows optimization of each layer's phosphor composition and thickness, enabling the use of large particle size phosphors that improve efficacy while distributing the powder weight across two optimized layers
2Use of energy by moving object
If larger phosphor particles are used, then lamp efficacy increases, but powder weight increases
Solution Approach 1:
By dividing the phosphor coating into two layers, the patent enables the use of large particle size phosphors (12-15 μm) that improve efficacy while distributing the total powder weight across two optimized layers, thus resolving the contradiction between efficacy improvement and powder weight increase
Solution Approach 2:
The patent optimizes the particle size parameter to 12-15 μm and controls the thickness and composition of each layer, achieving higher efficacy while managing the total powder weight through precise parameter control in the dual-layer structure
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 Jumbo phosphors in a dual layer configuration achieves higher lumens per watt and light output compared to standard-sized phosphors, with gains of up to 2.5% in lumens and LPW, and maintains lumen output without the practical limitations of increased powder weight, demonstrating improved energy efficiency and reduced greenhouse gas emissions.
Implementation Method 1
The use of rare earth phosphors for general illumination fluorescent lamp applications is well known. Rare earth phosphors contain at least one rare earth element, typically as the activator ion (e.g., Eu2+, Tb3+, Ce3+).
Implementation Method 2
the increase in lamp efficacy is greater when a dual layer of Jumbo phosphors is used as compared to the increase in efficacy obtained with a single layer of Jumbo phosphors
Data Source
AI summary
A phosphor blend is described wherein the blend consists of a red-emitting rare earth phosphor, a green-emitting rare earth phosphor, and a blue-emitting rare earth phosphor wherein the 50% size of the phosphors is between about 12 to 15 μm. The phosphor blend is incorporated into a fluorescent lamp having an increased efficacy. A dual layer coating may be used to provide an additional increase in efficacy.