Cd-Al Quantum Dot Core-Shell Structure for Luminescence and Lifespan
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Solution Overview
Problem
Current quantum dots used in optical members and electronic apparatuses have limitations in achieving high photoluminescence quantum yield (PLQY) and long lifespan, which are essential for high-quality optical performance.
Innovation Solution
A novel quantum dot is developed, comprising a core made of cadmium (Cd), aluminum (Al), and B1, covered by a first shell including Al, B1, and B2, with specific compositional ranges and structural configurations to enhance luminescence efficiency and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional quantum dots are used in optical members and electronic apparatuses, then the basic optical functions are achieved, but the photoluminescence quantum yield (PLQY) and lifespan are insufficient for high-quality performance
Solution Approach 1:
The patent employs composite material structures with a core-shell configuration where the core contains Cd, Al, and B1 elements, and the shell contains Al, B1, and B2 elements. This composite structure optimizes both luminescence efficiency and lifespan by combining materials with complementary properties, resolving the contradiction between reliability and productivity.
Solution Approach 2:
The patent applies local quality by creating distinct regions with different compositions - the core region optimized for luminescence generation and the shell region optimized for stability and protection. This spatial differentiation of material properties enables simultaneous achievement of high luminescence efficiency in the core and extended lifespan through the protective shell.
2Productivity
If quantum dot composition and structure are optimized for high PLQY, then luminescence efficiency improves, but achieving both high PLQY and long lifespan simultaneously remains challenging
Solution Approach 1:
The patent segments the quantum dot into functionally distinct core and shell portions. The core segment (Cd, Al, B1) is optimized for maximum luminescence efficiency, while the shell segment (Al, B1, B2) is optimized for structural stability and lifespan extension. This segmentation allows independent optimization of each region to simultaneously achieve high productivity and reliability.
Solution Approach 2:
The shell structure serves as a protective cushion that prevents degradation of the core quantum dot before failure occurs. By placing the more stable Al-containing shell around the sensitive but high-performance Cd-containing core, the structure provides beforehand protection that extends lifespan without significantly compromising luminescence efficiency.
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 novel quantum dot achieves improved luminescence efficiency and a longer lifespan, leading to the development of high-quality optical members, electronic apparatuses, and electronic devices.
Implementation Method 1
Quantum dots may be utilized as materials that perform one or more suitable optical functions (for example, a light conversion function, a light emission function)
Implementation Method 2
Quantum dots, which are semiconductor nanocrystals with a quantum confinement effect, may have different energy bandgaps by controlling the size and composition of the nanocrystals
Data Source
AI summary
A quantum dot, an optical member, an electronic apparatus, and an electronic device that include the quantum dot are provided. The quantum dot includes a core including cadmium (Cd), A1, and B1 and a first shell covering the core and including A1, B1, and B2, and is represented by Formula 1:CdxA11-xB1yB21-y Formula 1wherein, in Formula 1,A1 is a Group II element other than Cd,B1 and B2 are each independently a Group VI element,x is in a range of about 0.05 to about 0.3, andy is at least (e.g., greater than) 0.1 and at most (e.g., not more than) 0.6.