Red Quantum Dot Composite for Stable Display Color Conversion
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Solution Overview
Problem
Existing quantum dots used in display devices face issues with luminescence stability and reliability over time, particularly when exposed to light, leading to overshoot phenomena that affect color balance and uniformity.
Innovation Solution
A quantum dot composite is developed with a matrix containing quantum dots made of indium, zinc, phosphorous, selenium, and sulfur, optimized with specific mole ratios and a core-shell structure, which maintains luminescence efficiency and stability under light irradiation, preventing overshoot and ensuring consistent performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots are used in display devices, then luminescence properties can be controlled, but luminescence stability and reliability deteriorate over time when exposed to light
Solution Approach 1:
The patent employs a composite material structure consisting of a core quantum dot material (In-Zn-Se-S) combined with a shell material having different compositional ratios. This core-shell composite structure protects the core quantum dots from environmental degradation and light-induced damage, thereby maintaining luminescence stability and reliability over extended periods while preserving the desired luminescence properties.
Solution Approach 2:
The patent utilizes parameter changes by varying the compositional ratios of elements (In, Zn, Se, S) between the core and shell regions. The core has a specific mole ratio configuration optimized for luminescence, while the shell has different ratios optimized for stability and protection. This gradient compositional design allows simultaneous optimization of both luminescence performance and long-term reliability under light irradiation.
2Stability of the object's composition
If quantum dots are exposed to light for extended periods, then color balance and uniformity are affected, but luminescence overshoot occurs
Solution Approach 1:
The patent implements beforehand cushioning by designing a protective shell structure that anticipates and prevents light-induced degradation and overshoot phenomena. The shell acts as a buffer that absorbs and dissipates excess energy from prolonged light exposure, preventing it from reaching the core quantum dots and causing color shifts or luminescence overshoot, thereby maintaining both color balance and uniformity over time.
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 quantum dot composite effectively maintains luminescence within acceptable limits over extended periods, preventing overshoot and ensuring stable and uniform light emission, thereby improving the reliability and performance of display devices.
Implementation Method 1
the quantum dot composite is configured to maintain a luminescence of less than about 103 percent (%) relative to an initial luminescence thereof when the quantum dot composite is irradiated with light
Data Source
AI summary
A quantum dot composite includes a matrix and a plurality of quantum dots dispersed in the matrix, and a color conversion panel and a display panel including the same. The plurality of quantum dots include a metal including indium (In) and zinc and a non-metal including phosphorous (P), selenium, and sulfur, wherein the plurality of quantum dots includes a mole ratio of sulfur to indium of greater than or equal to about 3:1 and less than or equal to about 6:1, and a mole ratio of sulfur to selenium of greater than or equal about 0.69:1 and less than or equal to about 0.89, and a mole ratio of zinc to indium of greater than or equal to about 10:1 and less than or equal to about 12.4:1, and wherein the plurality of the quantum dots are configured to emit red light.