Quantum Dot Light-Emitting Layer with Singlet Oxygen Scavenging
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Solution Overview
Problem
Quantum dots in light-emitting elements are degraded by singlet oxygen, leading to reduced light emission characteristics and reliability when antioxidant ligands are coordinated.
Innovation Solution
Incorporating an aprotic singlet oxygen scavenger, such as tertiary amines, carotenoids, ethylenic compounds, naphthalenes, or anthracenes, within the functional layer of the light-emitting element to scavenge singlet oxygen and prevent degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antioxidant ligands are coordinated to quantum dots to prevent degradation, then quantum dot stability is improved, but dispersibility deteriorates
Solution Approach 1:
The patent introduces an aprotic singlet oxygen scavenger as an intermediary substance that mediates between the quantum dots and singlet oxygen. This scavenger prevents direct oxidation of quantum dots by singlet oxygen, providing protection without requiring coordination of antioxidant ligands to the quantum dot surface, thereby maintaining dispersibility while improving stability
Solution Approach 2:
The patent segments the protection function from the quantum dot surface by placing the singlet oxygen scavenger in a separate functional layer adjacent to the quantum dot layer. This segmentation allows the quantum dots to maintain their original surface properties and dispersibility while the separate layer provides oxidative protection
2Use of energy by moving object
If photosensitizers are present to generate singlet oxygen, then light absorption is improved, but quantum dot degradation increases
Solution Approach 1:
The patent converts the harmful effect of singlet oxygen generation into a beneficial protective mechanism by introducing an aprotic singlet oxygen scavenger. The scavenger selectively reacts with and neutralizes singlet oxygen generated by photosensitizers, protecting quantum dots from oxidation while allowing the photosensitizers to continue their light absorption and energy transfer function
Solution Approach 2:
The aprotic singlet oxygen scavenger acts as an intermediary that intercepts singlet oxygen between the photosensitizer and quantum dots. This mediator allows the photosensitizer-quantum dot energy transfer to proceed efficiently while preventing the harmful oxidation reaction
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 effectively reduces quantum dot degradation, enhancing emission efficiency and reliability of the light-emitting element.
Implementation Method 1
In order to solve the above problems, a light-emitting element according to an aspect of the present disclosure includes: a first electrode and a second electrode; and at least one functional layer provided between the first electrode and the second electrode, and containing an aprotic singlet oxygen scavenger.
Implementation Method 2
In the presence of a photosensitizer, oxygen in a ground state (triplet oxygen) is irradiated with excitation light such as ultraviolet light. Then, the triplet oxygen is excited, and singlet oxygen is generated. The quantum dots function as the photosensitizer.
Data Source
AI summary
A light-emitting element includes: an anode and a cathode; and at least one functional layer provided between the anode and the cathode, and containing a 1O2 scavenger to serve as an aprotic singlet oxygen scavenger.