Silicon Composition for OLED Dark Spot Prevention
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Solution Overview
Problem
Organic light emitting devices are vulnerable to humidity due to the permeation of water molecules, leading to the formation of dark spots caused by the high reactivity and different mobility rates of the H-polymer and main polymer in the silicon composition, which affects the device's operation and lifetime.
Innovation Solution
A silicon composition comprising specific silicon compounds represented by Formulas 1 and 2, with controlled ratios of k, m, and n, is used as a filler to reduce the mobility rate of the H-polymer, preventing its reaction with the organic material and thus inhibiting the formation of dark spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the H-polymer is used in the silicon composition to seal the organic material layer, then the device reliability is improved by preventing humidity permeation, but the manufacturing precision deteriorates due to dark spot formation caused by high reactivity and different mobility rates
Solution Approach 1:
The patent changes the chemical parameters of the silicon composition by specifying exact formulas for the main polymer (Formula 1) and H-polymer (Formula 2), and controlling the ratio parameter (k:(m+n) between 1:0.001 to 1:0.2). This parameter control adjusts the reactivity and mobility rates to prevent dark spot formation while maintaining sealing effectiveness.
Solution Approach 2:
The patent uses a composite silicon composition consisting of two different polymer components with specific chemical structures (Formula 1 and Formula 2). The composite structure allows the main polymer to provide structural stability while the H-polymer provides sealing function, with their combined properties preventing both humidity permeation and dark spot formation.
2Duration of action of stationary object
If the mobility rate of H-polymer is increased to improve sealing performance, then the device lifetime is extended by better humidity protection, but the harmful factors increase due to higher reactivity with organic material
Solution Approach 1:
The patent controls the mobility rate parameter by adjusting the chemical structure parameters (k, m, n values) and their ratios in the polymer formulas. This ensures the H-polymer has sufficient mobility to reach and seal against humidity while its reactivity is moderated to prevent harmful reactions with the organic light-emitting material.
Data Source
AI summary
A silicon composition with a silicon compound represented by Formula 1 and a silicon compound represented by Formula 2:wherein,R1, R2, R3, R4, R11, R12, R13, R14, R15, R16, R17, R18, and R19 are each independently a C1-C4 alkyl group,R5, R6, R7, R8, R9, and R10 are each independently hydrogen or deuterium,k, m, and n are positive integers,and the ratio of k to the sum of m and n is from about 1:0.001 to about 1:0.2;and an organic light emitting device including the same.