Chalcogenide Perovskite Color Conversion Particles With Passivating Shells
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Solution Overview
Problem
Chalcogenide perovskite nanoparticles suffer from non-radiative recombination of carriers on the particle surface, leading to insufficient emission intensity.
Innovation Solution
A color conversion particle comprising a chalcogenide perovskite particle body covered by a semiconductor shell with a band gap greater than 2.7 eV, which transmits excitation light and inactivates surface defects to enhance emission intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chalcogenide perovskite nanoparticles are used for color conversion, then high light absorption coefficient and durability are achieved, but non-radiative recombination occurs on the particle surface resulting in insufficient emission intensity
Solution Approach 1:
A shell layer comprising a semiconductor material with a band gap of 2.7 eV or more is introduced as an intermediary between the chalcogenide perovskite particle body and the external environment. This shell layer passivates surface defects and suppresses non-radiative recombination of carriers, thereby improving emission intensity while maintaining the high durability and light absorption coefficient of the chalcogenide perovskite core material
2Use of energy by moving object
If chalcogenide perovskite nanoparticles are used for color conversion, then high light absorption coefficient is achieved, but non-radiative recombination on the particle surface reduces emission intensity
Solution Approach 1:
The shell layer acts as a mediator that preserves the high light absorption coefficient of the chalcogenide perovskite core while eliminating surface defect-induced non-radiative recombination. The shell material with band gap ≥2.7 eV allows efficient carrier confinement and radiative recombination, thereby converting the absorbed light energy into emitted light more effectively
Solution Approach 2:
The invention creates a composite structure consisting of a chalcogenide perovskite core and a semiconductor shell layer. This core-shell composite combines the advantages of both materials: the core provides high light absorption coefficient and durability, while the shell provides surface passivation and enhanced radiative emission, achieving both high light absorption and high emission intensity
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 effectively suppresses non-radiative recombination, resulting in higher emission intensity compared to conventional chalcogenide perovskite nanoparticles.
Implementation Method 1
a particle body that contains a chalcogenide perovskite and emits light in response to excitation light received
Implementation Method 2
emits light in response to excitation light received
Implementation Method 3
a shell that is formed of a semiconductor material for transmitting the excitation light
Implementation Method 4
The shell has a band gap more than 2.7 eV
Implementation Method 5
covers the particle body to inactivate defects on the surface of the particle body
Implementation Method 6
suppresses non-radiative recombination of carriers on the particle surface
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
A color conversion particle includes: a particle body that contains a chalcogenide perovskite and emits light in response to excitation light received; and a shell that is formed of a semiconductor material for transmitting the excitation light and covers the particle body to inactivate defects on the surface of the particle body. The shell has a band gap more than 2.7 eV.