Perovskite Nanoparticle Flow Synthesis for High-Concentration Emission Control

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Solution Overview

Problem

Existing methods for producing photoresponsive nanoparticles with a perovskite-type crystalline structure face challenges in achieving high product concentration and efficient flow synthesis, particularly for display elements, due to issues like low concentration and excessive waste production, and require longer emission peak wavelengths.

Innovation Solution

A method involving continuous transport and mixing of a lead halide and fatty acid cesium raw material liquids at controlled temperatures using a heated mixer, optimizing the flow synthesis process to achieve high concentration and uniform particle sizes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If cesium carbonate is dissolved in oleic acid and octadecene to enable pumping and flow synthesis, then photoresponsive nanoparticles can be continuously synthesized by continuously feeding raw material solution, but the product concentration remains low and a large amount of waste liquid is produced

Engineering Contradiction:

Improvecontinuous synthesis capabilityVSAvoidproduct concentration

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent changes the chemical parameters of the raw materials by replacing cesium carbonate with cesium oleate and adjusting the solvent composition. This parameter change enables high-concentration flow synthesis while maintaining continuous production capability, resolving the contradiction between continuous synthesis and product concentration

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies different solvent systems to different components: using a specific mixture of oleic acid and octadecene for cesium oleate, while using oleic acid and oleylamine for lead halide. This localized optimization of solvent quality for each component enables high product concentration without compromising continuous synthesis

Inventive Principle:

Principle #3Local quality

2Ease of operation

If a larger amount of oleic acid is used to dissolve cesium carbonate, then the raw material can be pumped for flow synthesis, but the product concentration becomes low resulting in excessive waste liquid production

Engineering Contradiction:

ImprovepumpabilityVSAvoidwaste liquid volume

Core Design Contradiction:

Ease of operationVSLoss of substance

Solution Approach 1:

The patent changes the chemical form of cesium from carbonate to oleate, and adjusts the solvent ratio and composition. This parameter change maintains the liquid state and pumpability of the raw material while significantly reducing the total volume of solvent required, thereby reducing waste liquid production

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses cesium oleate which already contains the oleic acid ligand structure incorporated into the salt form, eliminating the need for excessive additional oleic acid to dissolve cesium carbonate. This structural copying approach reduces solvent volume while maintaining pumpability

Inventive Principle:

Principle #26Copying

3Productivity

If flow synthesis is used to control temperature and reaction time, then photoresponsive nanoparticles can be continuously synthesized, but the emission peak wavelength is limited to the blue region (465-488 nm) rather than achieving green (530 nm) or red (630 nm) wavelengths required for display elements

Engineering Contradiction:

Improvecontinuous productionVSAvoidemission wavelength range

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent changes multiple parameters including the anion composition (Br/I ratio), the chemical form of cesium (oleate instead of carbonate), temperature, and flow rates. These parameter changes enable continuous flow synthesis to produce nanoparticles with emission wavelengths spanning blue, green, and red regions, making the process adaptable for display element applications

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite anion systems (mixtures of bromide and iodide) to achieve intermediate emission wavelengths between the extremes of pure bromide (blue) and pure iodide (red) compounds. This composite approach enables tuning of emission color across the visible spectrum while maintaining continuous production

Inventive Principle:

Principle #40Composite materials

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

Enables the production of photoresponsive nanoparticles with perovskite-type crystalline structure at high concentration and controlled emission peak wavelengths, reducing waste and improving productivity.

Implementation Method 1

a first step of continuously transporting a first raw material liquid containing a lead halide and a second raw material liquid containing a fatty acid cesium to a heated mixer through a transport path

Methodology Applied

Scientific EffectHeating: Heating

Implementation Method 2

Methodology Applied

Scientific EffectFluid flow: Convection

Implementation Method 3

a second step of mixing the first raw material liquid and the second raw material liquid

Methodology Applied

Scientific EffectMixing: Stirring

Data Source

PatentUS12545593B2Method for producing photoresponsive nanoparticle with perovskite-type crystalline structure

Publication Date: 2026.02.10 CANON KK

AI summary

A method for producing a photoresponsive nanoparticle. The method includes a first step of continuously transporting a first raw material liquid containing a lead halide and a second raw material liquid containing a fatty acid cesium to a heated mixer through a transport path, and a second step of mixing the first raw material liquid and the second raw material liquid.