Chalcogenide Perovskite Color Conversion Particles for Low Reabsorption
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Solution Overview
Problem
Conventional quantum dots face a trade-off between absorbance and light emission reabsorption loss, with chalcogenide perovskites exhibiting high absorbance but significant reabsorption losses, and other materials like InP having durability and efficiency issues.
Innovation Solution
A color conversion particle comprising a chalcogenide perovskite core and a shell with band alignment that induces a Stokes shift, allowing high absorbance and efficient light emission while minimizing reabsorption loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the particle size is reduced to suppress reabsorption loss, then light emission efficiency is improved, but absorbance decreases
Solution Approach 1:
The quantum dot is segmented into a core-shell structure where the core (chalcogenide perovskite) and shell (different material) are separated by an interface. This segmentation allows the core to absorb light while the shell emits light at a different wavelength, preventing reabsorption and resolving the contradiction between absorbance and reabsorption loss.
Solution Approach 2:
Different regions of the quantum dot are assigned different materials with specific optical properties. The core has high absorbance while the shell has different emission characteristics, creating local quality differences that enable high absorbance without corresponding reabsorption loss.
2Ease of manufacture
If conventional phosphors are used for color conversion, then manufacturing is simple, but color purity and emission wavelength controllability are insufficient
Solution Approach 1:
The emission wavelength is controlled by changing the particle size parameter of the quantum dot. As particle size decreases, the emission wavelength shifts to shorter wavelengths due to quantum confinement effects, providing precise controllability while maintaining a relatively simple core-shell synthesis process.
Solution Approach 2:
The quantum dot uses composite materials with a chalcogenide perovskite core and a shell of different material. This composite structure enables precise tuning of optical properties while maintaining manufacturability through established quantum dot synthesis methods.
3Object-affected harmful factors
If InP is used as an alternative to CdSe, then toxicity is reduced, but material durability and light emission efficiency deteriorate
Solution Approach 1:
The shell acts as an intermediary layer that protects the chalcogenide perovskite core from environmental degradation while allowing the core to maintain its superior optical properties. This shell structure provides the durability that InP lacks while avoiding the toxicity of CdSe.
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 achieves high absorbance and light emission efficiency with reduced reabsorption loss, leveraging the durability and light absorption properties of chalcogenide perovskites.
Implementation Method 1
color conversion using wavelength conversion (downconversion) of converting excitation light incident on an object from the outside into light having a longer wavelength and emitting the light
Implementation Method 2
The core and the shell have band alignment that induces a Stokes shift
Data Source
AI summary
A color conversion particle includes a core; and a shell that contains the core and absorbs excitation light, and emits light at the core or at an interface between the core and the shell upon receiving the irradiated excitation light. The core is composed of a chalcogenide perovskite, and the core and the shell have band alignment that induces a Stokes shift.