Delayed Fluorescence Quantum Dot Electroluminescent Diode
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The luminous efficiency of electroluminescent diodes using quantum dots is low due to difficulties in restraining excitons within the quantum dots, leading to inefficient light emission.
Innovation Solution
Incorporating a delayed fluorescence material into the electroluminescent diode structure, where the energy of the host material is transferred to the delayed fluorescence material and then to the quantum dots, enhancing the light emission efficiency by exciting more electrons into a singlet energy state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots are used as the light emitting material, then color purity and natural color display are improved, but luminous efficiency deteriorates due to difficulty in restraining excitons
Solution Approach 1:
The patent introduces a delayed fluorescence material as an intermediary between the host material and quantum dots. This mediator receives energy from the host material and transfers it to the quantum dots, enabling more effective exciton formation and light emission while maintaining the color purity benefits of quantum dots
Solution Approach 2:
The patent modifies the energy level parameters of the system by selecting a delayed fluorescence material with specific energy levels (S1 and T1) that are strategically positioned between the host material and quantum dots. This energy level tuning enables efficient energy transfer and improves luminous efficiency while preserving color quality
2Adaptability or versatility
If conventional organic materials are used in OLEDs to display different colors, then color display capability is achieved, but device complexity increases due to material changes
Solution Approach 1:
The patent makes quantum dots a universal light emitting material that can display different colors by controlling particle size rather than changing materials. The quantum dots replace multiple organic light emitting materials with a single multi-functional material system, simplifying device structure while maintaining color display capability
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
This approach significantly improves the quantum efficiency and current efficiency of the electroluminescent diode by increasing the number of excitons formed in the quantum dots, resulting in higher luminous efficiency compared to conventional OLEDs.
Implementation Method 1
a delayed fluorescence material which supplies energy to the QD
Implementation Method 2
the energy of the host material is transferred to the delayed fluorescence material and then to the quantum dots
Implementation Method 3
a quantum dot (QD) is a semiconductor material with a crystalline structure having a size of several nanometers and has a characteristic of emitting light by itself through a quantum effect
Implementation Method 4
a quantum dot (QD) is a semiconductor material with a crystalline structure having a size of several nanometers and has a characteristic of emitting light by itself through a quantum effect
Data Source
AI summary
The present invention relates to a delayed fluorescence-quantum dot (QD) electroluminescent diode, the delayed fluorescence-quantum dot electroluminescent diode includes an anode, a cathode, and a light emitting layer located between the anode and the cathode, and the light emitting layer includes a QD and a delayed fluorescence material which supplies energy to the QD.