Quantum Dot Core Composition for High PLQY 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 a first semiconductor compound represented by Formula 1, CdxA1-x1B1, where A1 is a Group II element other than Cd, B1 is a Group VI element, and x is greater than 0 but not more than 0.12, covered by a first shell. This quantum dot has a core radius of 5 nm or more and is incorporated into an ink composition, optical member, electronic apparatus, and electronic device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional quantum dots are used in optical members, then the device can be manufactured, but the photoluminescence quantum yield (PLQY) is insufficient and lifespan is short
Solution Approach 1:
The patent changes the compositional parameters of the quantum dot core by using a specific formula CdxA1-x1B1 with controlled x values (0 < x ≤ 0.12), where A1 is a Group II element and B1 is a Group VI element. This parameter optimization achieves high PLQY and long lifespan while maintaining manufacturability through controlled synthesis conditions
Solution Approach 2:
The patent creates a composite quantum dot structure with a core comprising multiple elements (Cd, A1, B1) in specific ratios, where the composite composition CdxA1-x1B1 synergistically improves both PLQY and lifespan. The core may be further composite with shell layers for enhanced stability and performance
2Reliability
If the core radius is increased to 5 nm or more, then luminescence efficiency improves, but the quantum dot size increases
Solution Approach 1:
The patent optimizes the core radius parameter to be 5 nm or more, which is the critical threshold for achieving high luminescence efficiency. This parameter change balances the quantum confinement effect with radiative recombination efficiency, ensuring optimal optical performance without excessive size increase
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 excellent luminescence efficiency and a long lifespan, enhancing the quality of optical members and electronic devices by improving light emission characteristics and durability.
Implementation Method 1
quantum dots may be used as emitters... excellent or suitable photoluminescence quantum yield (PLQY)
Data Source
AI summary
A quantum dot, and an ink composition, an optical member, an electronic apparatus, and an electronic device that include the quantum dot are provided. The quantum dot includes a core including a first semiconductor compound represented by Formula 1 and a first shell covering the core and including A1, wherein a radius of the core of the quantum dot is 5 nm or more and Formula 1 is:CdxA1-x1B1 Formula 1wherein, in Formula 1, A1 may be a Group II element other than cadmium (Cd), B1 may be a Group VI element, and x may be greater than 0 but not more than 0.12.