Self-Adhesive Polymer for Electroluminescent Devices
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Solution Overview
Problem
Conventional self-adhesive polymers used in electroluminescent devices have limitations in luminosity and long-term stability, requiring additional functional elements and process steps, which increase device size and weight.
Innovation Solution
A self-adhesive polymer with a relative permittivity of more than 4.5, composed of (meth)acrylic acid derivatives with cyano and nitro groups, is used as a binder matrix, enhancing luminance and long-term stability by maintaining high cohesion and bond strength while allowing for efficient electroluminescence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional self-adhesive polymers are used in electroluminescent devices, then the device can be manufactured with standard materials, but the luminosity is insufficient and long-term stability is limited
Solution Approach 1:
The patent changes the dielectric constant parameter of the self-adhesive polymer from conventional values (typically 2-4) to a high dielectric constant (>4.5), which significantly enhances both luminosity and long-term stability of the electroluminescent device. This parameter modification allows the polymer to maintain high cohesion and bond strength while enabling efficient electroluminescence.
Solution Approach 2:
The patent employs composite material design by incorporating specific functional groups (cyano and nitro groups) within the polymer structure to achieve the desired high dielectric constant. The self-adhesive polymer is formulated as a composite system that integrates adhesive properties with electroluminescent functionality, eliminating the need for separate functional elements.
2Reliability
If additional functional elements are added to enhance luminosity and stability, then device performance improves, but device size and weight increase
Solution Approach 1:
The patent achieves multi-functionality by designing the self-adhesive polymer to simultaneously provide adhesive bonding, high dielectric constant for electroluminescence, and structural stability. This universal material replaces multiple separate functional elements (adhesive layer, dielectric layer, structural support), thereby reducing device weight and size while maintaining or improving performance.
Solution Approach 2:
The patent merges the functions of adhesion and electroluminescence into a single material system. The self-adhesive polymer with high dielectric constant combines the bonding capability with the electrical insulation and luminosity generation functions, eliminating the need for separate functional layers and reducing overall device complexity and weight.
3Strength
If the self-adhesive polymer has high cohesion and bond strength, then bonding reliability improves, but luminance may be reduced
Solution Approach 1:
The patent optimizes the dielectric constant parameter to a specific range (>4.5) that simultaneously achieves high bond strength and high luminance. This parameter optimization allows the polymer to maintain strong cohesive forces while enabling efficient charge storage and light emission during electroluminescence operation.
Solution Approach 2:
The patent applies local quality modification by incorporating specific functional groups (cyano and nitro groups) at strategic positions within the polymer structure. These localized functional groups provide the necessary dipole moments for high dielectric constant while maintaining overall polymer cohesion and bond strength through appropriate molecular architecture.
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 polymer achieves significantly higher luminance and longer service life in electroluminescent devices, reducing the need for additional components and process steps, and provides a compromise between high luminance and low power loss.
Implementation Method 1
The emission of light and other electromagnetic radiation that occurs here is referred to as electroluminescence.
Implementation Method 2
a self-adhesive polymer which has a relative permittivity of more than 4.5
Data Source
AI summary
Polymer with a relative permittivity of greater than 4.5, is new. Independent claims are included for: (1) a self adhesive mass with a relative permittivity of greater than 4.5; (2) a self adhesive electroluminescent composition comprising a light source and a self-adhesive mass; and (3) an electroluminescent device comprising at least substantially transparent first electrode, a second electrode and an electroluminescent composition.