Luminescence Conversion Layer Uniformity via Solvent Sedimentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional radiation-emitting components face challenges in achieving uniform color impression and high efficiency due to non-uniform luminescence conversion substance distribution and the use of adhesive layers that can act as optical waveguides, leading to inadequate radiation conversion and heat dissipation.
Innovation Solution
A method for producing a luminescence conversion substance layer directly on a semiconductor element using a composition comprising the substance, a matrix material, and a solvent, which allows for sedimentation and solvent removal without turbulent flows, ensuring improved uniformity and adhesion, eliminating the need for adhesives and enhancing radiation conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive layers are used to attach luminescence conversion substances, then the substances can be fixed on the substrate, but the adhesive layers act as optical waveguides causing radiation losses and reducing conversion efficiency
Solution Approach 1:
The invention removes the adhesive layer from the system by enabling direct bonding of the luminescence conversion substance to the substrate through surface activation methods (plasma treatment, chemical etching, or primer application). This extraction eliminates the optical waveguide effect that causes radiation loss while maintaining secure attachment of the phosphor particles.
2Ease of manufacture
If conventional compositions without solvent are used, then the luminescence conversion substance can be applied, but turbulent flows occur during application leading to non-uniform distribution
Solution Approach 1:
The invention introduces a solvent as an intermediary medium in the composition formulation. This solvent acts as a flow mediator that suppresses turbulent flows during application, enabling smooth and uniform deposition of luminescence conversion substances. The solvent evaporates after application, leaving behind a uniformly distributed phosphor layer without the turbulence problems of solvent-free compositions.
3Productivity
If heating is applied to remove solvent from composition, then solvent removal is accelerated, but additional energy input and process complexity are required
Solution Approach 1:
The invention employs solvent selection strategies where the chosen solvents have inherently suitable evaporation characteristics that allow passive or minimal-energy removal. By selecting solvents with appropriate boiling points and vapor pressures, the system enables solvent evaporation through natural processes or minimal heating, eliminating the need for complex heated drying equipment or multi-step removal processes.
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 method results in a uniformly formed luminescence conversion substance layer with improved adhesion, reduced radiation losses, and enhanced heat dissipation, leading to a more uniform color impression and increased conversion efficiency of radiation-emitting components.
Implementation Method 1
luminescence conversion substances are often used in order to partly convert the radiation emitted by a radiation source into a radiation having a changed wavelength
Implementation Method 2
removing at least a part of the solvent, so that the luminescence conversion substance layer is formed on the substrate
Implementation Method 3
The luminescence conversion substance layer can be formed at least partly by sedimentation, that is, settling, of the luminescence conversion substance
Data Source
AI summary
One embodiment of the invention describes a method for producing a luminescence conversion substance layer on a substrate with a semiconductor element that emits a primary radiation during operation. A composition includes a luminescence conversion substance, a matrix material and a solvent. The composition is applied to a substrate. At least part of the solvent is removed, with the result that the luminescence conversion substance layer is formed on the substrate.