Perovskite Color Conversion Element for High Luminance Green Light
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Solution Overview
Problem
Current color conversion elements in display devices face challenges in achieving high luminance and light conversion efficiency, particularly in emitting green light, due to limitations with InP quantum dots which require precise particle size control for high color purity and uniformity.
Innovation Solution
A color conversion element utilizing a perovskite compound, specifically represented by Formula A m B n X l, where A is Cs or Rb, B includes Cu, Sb, Ge, or Bi, and X is F, Cl, or Br, is used to convert incident blue light into green or red light, offering high luminance and light conversion efficiency without the need for precise particle size control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If InP quantum dots are used for color conversion, then color purity can be improved, but manufacturing precision requirements increase due to the need for precise particle size control
Solution Approach 1:
The patent changes the material parameter from InP quantum dots to perovskite compounds (specifically CsPbX3 where X = Cl, Br, or I). This material substitution fundamentally alters the relationship between particle size and optical properties. Perovskite compounds achieve high color purity through their intrinsic bandgap properties rather than relying on quantum confinement effects that require precise size control, thus resolving the contradiction between color purity and manufacturing precision
Solution Approach 2:
The patent employs perovskite compounds as a composite material alternative to InP quantum dots. The perovskite structure (ABX3) with specific cations and halides creates a material system where optical properties are determined by composition ratios rather than particle size, enabling high color purity without stringent size control requirements during manufacturing
2Loss of energy
If perovskite compounds are used for color conversion, then light conversion efficiency is improved, but stability may worsen due to material sensitivity
Solution Approach 1:
The patent applies local quality protection by introducing encapsulation layers and surface passivation treatments specifically for the perovskite color conversion particles. These protective measures are applied locally to the perovskite material to prevent moisture and oxygen ingress while preserving the high light conversion efficiency of the perovskite core structure
Solution Approach 2:
The patent creates a composite structure where perovskite color conversion particles are embedded in a protective matrix or encapsulated with stable shell materials. This composite approach combines the high light conversion efficiency of perovskite with the stability of protective materials, resolving the contradiction between efficiency and reliability
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 perovskite compound-based color conversion element achieves high luminance and light conversion efficiency for green light emission, outperforming InP quantum dots by emitting light with high color purity and efficiency across the desired wavelength bands without requiring precise particle size uniformity.
Implementation Method 1
the color conversion element may receive blue light from a light source and emit blue light, green light, and red light, respectively
Data Source
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AI summary
A color conversion element and a display device including the same are provided. The color conversion element includes: a base substrate in which a first region and a second region are defined; a color conversion layer on the base substrate, in the first region, and including color conversion particles configured to convert a wavelength of incident light; and a color light transmitting layer on the base substrate and in the second region; wherein each of the color conversion particles includes a compound represented by Formula 1 (AmBnXI--- (1)), where, in Formula 1, A is Cs, Rb, or an alloy thereof; B is at least one of Cu, Sb, Ge, Sn, and Bi, or an alloy thereof; m, n, and I are each an integer of 1 to 9; and X is at least one of F, CI, Br, and I, or a mixture thereof.