Inorganic Electroluminescent Sheet Coating Process
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Solution Overview
Problem
Existing inorganic electroluminescent sheets face challenges in achieving high productivity at low costs and maintaining desired light transmittance when no electric voltage is applied, with existing methods being complex and expensive, and lacking suitable mass production capabilities.
Innovation Solution
A luminescent composition comprising an inorganic electroluminescent substance and a binder resin, where the inorganic electroluminescent substance content is adjusted within a specific range, and a thermoplastic resin with a softening point between 30°C to 270°C is used, along with optional additives like precipitation inhibitors and color modifiers, to form an inorganic electroluminescent layer that can be extruded into a sheet shape for efficient lamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods (sintering, laser abrasion, MBE, PVD, CVD) are used to form the electroluminescent layer, then the electroluminescent sheet has good weather resistance, heat resistance, and long-term stability, but the production process becomes complicated and expensive
Solution Approach 1:
The patent changes the formation method from conventional high-energy processes (sintering, PVD, CVD) to a low-temperature coating process using luminescent paste. The paste is applied by coating techniques and dried at low temperature, fundamentally changing the processing parameters to achieve both simplicity and reliability
Solution Approach 2:
The patent uses a disposable luminescent paste formulation that can be easily applied and dried, replacing expensive and complex equipment-based methods. The paste contains inorganic electroluminescent particles suspended in a binder that forms a stable layer after drying, providing a cost-effective solution
2Reliability
If conventional methods are used to form the electroluminescent layer, then the electroluminescent sheet has good weather resistance and long-term stability, but the production cost becomes very high
Solution Approach 1:
The patent replaces expensive equipment-based formation methods with a low-cost coating process. The luminescent paste is formulated with inexpensive inorganic particles and binder, applied by simple coating techniques, and dried at low temperature, dramatically reducing production costs while maintaining reliability
Solution Approach 2:
The patent substitutes complex mechanical and thermal processes (sintering, PVD, CVD) with a simple coating and drying process. The luminescent paste is applied as a liquid or semi-liquid coating and cured by low-temperature drying, eliminating the need for expensive equipment and complex machinery
3Illumination intensity
If the inorganic electroluminescent substance content is increased to improve luminance, then the light emission intensity increases, but the light transmittance decreases
Solution Approach 1:
The patent optimizes the particle size parameters of the inorganic electroluminescent particles to achieve optimal balance between luminance and transmittance. By controlling particle size within specific ranges, the paste achieves good light emission while maintaining adequate transparency in the non-emitting state
Solution Approach 2:
The patent uses composite material formulation combining inorganic electroluminescent particles with organic binder resin. The composite structure allows the inorganic particles to provide luminance while the organic binder maintains matrix continuity and light transmittance, achieving balance between these opposing requirements
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
This approach enables the production of inorganic electroluminescent sheets with high productivity and low costs, achieving desired light transmittance and luminance, suitable for applications such as advertising media, decorating media, and privacy protection, while allowing for mass production.
Implementation Method 1
the binder resin is a thermoplastic resin having a softening point of from 30 to 270°C
Implementation Method 2
there are known electroluminescent devices capable of emitting light by applying an electric voltage thereto
Data Source
Figure 1~4
AI summary
The present invention provides a luminescent composition which is capable of providing an inorganic electroluminescent sheet with a high productivity at low costs in an efficient manner, and has a desired light transmittance (transparency) when no electric voltage is applied thereto, an inorganic electroluminescent sheet obtained from the luminescent composition which can be mass-produced, and a process for producing the inorganic electroluminescent sheet. The present invention relates to a luminescent composition including an inorganic electroluminescent substance and a binder resin, wherein a content of the inorganic electroluminescent substance is not less than 0.5 part by mass and less than 100 parts by mass on the basis of 100 parts by mass of the binder resin; and an inorganic electroluminescent sheet including at least a first transparent substrate, a first transparent electrode, an inorganic electroluminescent layer, a first transparent electrode and a second transparent substrate which are successively laminated in this order, wherein the inorganic electroluminescent layer is formed from the above luminescent composition, and the inorganic electroluminescent sheet has a light transmittance of 60% or more as measured at a wavelength of 550 nm under a non-light emitting condition.