Perovskite Luminescent Material with Amine-Neutralizing Silica Shell
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Solution Overview
Problem
Existing perovskite nanocrystals face issues with efficiency, stability, and scalability due to interference from amine-functionalized dispersants and ligands that affect the crystalline structure.
Innovation Solution
Formulating perovskite crystals with a di(meth)acrylate compound of Formula 1, which reacts with amine groups of aminosilane or dispersants, forming a protective silica shell and passivating the perovskite surface, allowing the use of previously incompatible dispersants to enhance photoluminescence quantum yield and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If amine-functionalized dispersants and ligands are used to formulate perovskite nanocrystals, then the nanocrystals can be dispersed and processed, but the crystalline structure is affected and performance deteriorates
Solution Approach 1:
The patent introduces a carboxylic acid compound as an intermediary substance that mediates between the amine-functionalized dispersant and the perovskite nanocrystal. The carboxylic acid reacts with the amine groups to form ammonium carboxylate salts, preventing direct interaction between the amine groups and the perovskite surface. This intermediary approach allows the dispersant to maintain its dispersing function while eliminating the harmful effect on the crystalline structure.
Solution Approach 2:
The patent converts the harmful amine groups into beneficial ammonium carboxylate salts through chemical reaction. The amine groups, which originally caused degradation of the perovskite crystalline structure, are transformed into non-harmful salt forms that maintain the dispersing functionality while eliminating the detrimental effects on phase stability and photoluminescence performance.
2Adaptability or versatility
If surface modifications are made to improve perovskite nanocrystal performance, then dispersibility is enhanced, but the crystalline structure is interfered with and efficiency is reduced
Solution Approach 1:
The carboxylic acid compound serves as a protective intermediary that prevents direct surface modification of the perovskite nanocrystals by amine-functionalized dispersants. By reacting with the amine groups beforehand, it creates a protective layer that allows dispersibility enhancement without direct interference with the crystalline structure, thereby maintaining phase stability.
Solution Approach 2:
The patent applies preliminary action by pre-reacting the carboxylic acid compound with the amine-functionalized dispersant before contacting it with the perovskite nanocrystals. This preliminary modification of the dispersant ensures that the harmful amine groups are neutralized in advance, allowing subsequent surface modification to proceed without damaging the crystalline structure.
3Ease of manufacture
If conventional dispersants are used to achieve solution processability, then manufacturing is simplified, but photoluminescence quantum yield and thermal stability are reduced
Solution Approach 1:
The carboxylic acid compound acts as a protective intermediary that enables the use of conventional amine-functionalized dispersants for solution processing while preventing them from degrading the photoluminescence quantum yield and thermal stability. The intermediary reacts with the dispersant to create a non-harmful complex that maintains solution processability without sacrificing optoelectronic performance.
Solution Approach 2:
The patent converts the harmful effect of conventional dispersants on photoluminescence quantum yield and thermal stability into a beneficial situation by transforming the amine groups into non-harmful ammonium carboxylate salts. This allows the continued use of conventional dispersants for easy solution processing while eliminating their detrimental effects on device performance.
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 improves the photoluminescence quantum yield, thermal stability, and phase stability of perovskite nanocrystals by neutralizing amine groups and forming a protective silica shell, enabling the use of previously incompatible dispersants to enhance performance.
Implementation Method 1
a di(meth)acrylate compound of Formula 1... reacts with amine groups of aminosilane or dispersants, forming a protective silica shell and passivating the perovskite surface
Implementation Method 2
high photoluminescence quantum yields... improve the photoluminescence quantum yield
Data Source
Figure 1
Figure 2~3b
Figure 4~5
AI summary
A luminescent material comprises a perovskite crystal, a di(meth)acrylate compound of Formula 1 and an aminosilane compound or dispersant: wherein each E is independently H or CH3; each G is independently a branched or unbranched C1-C10 alkanediyl or C3-C12 cycloalkanediyl, optionally substituted with 1 to 3 L5; J is phosphate [OP(=O)(OQ')O], phosphonate [[OP(=O)(OQ1)] carbonate [OC(=O)O], sulfonate [OS(=O)2] or sulfate [OS(=O)2O]; wherein Q1 is independently selected from the group consisting of H, branched or unbranched C1-C10 alkyl or C3-C12 cycloalkyl and C2-C4 alkenyl; each L5 is independently selected from the group consisting of halogen, OH, SH, C1-C4 alkyl, C2-C4 alkenyl, or -[OCH2CH2-]nOQ2; wherein n is an integer from 1 to 10, and each Q2 is independently selected from the group consisting of H, branched or unbranched C1-C10 alkyl or C3-C12 cycloalkyl and C2-C4 alkenyl.