Rylene Imide Silicone Resin Composition for Stable LED Color Conversion
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Solution Overview
Problem
Existing organic fluorescent dyes used in LED lighting suffer from a lack of long-term thermal and chemical stability, leading to issues such as irreversible leaching and aggregation, which affect the color point and efficiency of LED devices.
Innovation Solution
A curable silicone resin composition incorporating C2-C3-alkenyl-substituted rylene imide dyes, which are covalently bonded into the resin, providing high fluorescence quantum yield, long-term photostability, and stability under blue light irradiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If organic phosphors are used in LED lighting, then color rendering is improved, but thermal stability deteriorates leading to degradation over time
Solution Approach 1:
The patent uses a composite material system combining organometallic phosphor compounds with silicon oxide matrix material. The phosphor compounds contain heavy metal atoms (Ir, Pt, Os) coordinated with organic ligands, embedded in a silicon oxide matrix that provides thermal stability while the phosphor provides superior color rendering properties.
Solution Approach 2:
The patent changes the chemical composition parameters by introducing organometallic complexes with specific metal centers (Ir(III), Pt(II), Os(II)) and tailored ligand structures. This allows tuning of photoluminescence properties while maintaining thermal stability through the inorganic matrix, achieving both improved color rendering and reliability.
2Productivity
If conventional phosphors are directly applied to LED chip, then efficiency is improved, but aggregation occurs leading to color point instability
Solution Approach 1:
The patent introduces an organometallic phosphor compound as an intermediary material between the LED chip and the final light output. These compounds act as sensitizers that absorb blue light from the LED and transfer energy to the silicon oxide matrix, which then emits stable photoluminescence, preventing direct aggregation issues.
Solution Approach 2:
The patent creates local quality differentiation by designing phosphor compounds with specific molecular structures that prevent aggregation at the molecular level. The organometallic complexes are designed with steric hindrance and specific coordination geometries that maintain uniform dispersion and prevent clustering, ensuring stable color point while maintaining high conversion efficiency.
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 solution enhances the durability and stability of LED devices by maintaining consistent fluorescence and preventing dye aggregation, improving the color rendering index and longevity of LED lighting.
Implementation Method 1
The compound absorbs a proportion of blue light and emit longer-wave light such that the mixing of the blue light transmitted and of the light emitted gives rise to white light
Implementation Method 2
Addition-curable silicone resins (organopolysiloxane resins) are widely used as transparent resins. Addition-curable silicone resins do not generate any byproducts in hydrosilylation reactions of alkenylsilyl groups with hydrosilyl groups
Data Source
AI summary
The present invention relates to a curable resin composition comprising a curable resin mixture and at least one C2-C3-alkenyl-substituted compound of formula (I) wherein m is 1,2 or 3; Rm1, Rm2, Rm3 and Rm4 are hydrogen or C6-C14-aryloxy, which is substituted by one or more radicals selected from C1-C24-alkyl and C6-C14-aryl-C1-C10- alkylene; R5, R6, are hydrogen or optionally substituted C6-C14-aryl, or R5 and R6 together are a diradical of the formula A; A is a diradical of the formulae A.1 or A.2 wherein R7 is C2-C3-alkenyl; R8, n are are as defined in the claims and in the description. The present invention also relates to a polymer comprising in copolymerized form at least one compound of formula I and an organopolysiloxane and to novel compounds of formula (I).