Quantum Dot LED Green Amber Emission via Click Chemistry
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current light emitting diode (LED) technologies struggle to produce efficient green or amber emission without the use of downconverters, which limits their performance and efficiency.
Innovation Solution
The development of light emitting devices that incorporate an inorganic semiconductor substrate with a close-packed layer of quantum dots covalently bonded to the substrate, using linkers formed through click chemistry reactions, and an overlayer for charge carrier injection, enabling direct green or amber emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional LED structures are used for green or amber emission, then device simplicity is maintained, but efficiency and performance are insufficient
Solution Approach 1:
The patent employs a composite structure combining inorganic semiconductor substrate with organic quantum dots functionalized by linkers. This composite approach enables direct green or amber emission from the quantum dots while maintaining structural organization through the linker molecules, achieving high emission efficiency without requiring complex downconverter assemblies
Solution Approach 2:
The device structure is segmented into distinct functional layers: the inorganic semiconductor substrate provides electrical communication, the linker molecules provide chemical attachment and spacing, and the quantum dots provide light emission. This segmentation allows each component to be optimized independently while working together to achieve high efficiency emission
2Use of energy by moving object
If downconverters are used in LED structures, then green or amber emission is achieved, but additional energy loss occurs
Solution Approach 1:
The patent extracts the downconverter component entirely from the LED structure and replaces it with quantum dots that emit green or amber light directly. The quantum dots are functionalized with linkers that attach them to the inorganic semiconductor substrate, eliminating the need for blue LED + downconverter architecture and the associated energy losses
Solution Approach 2:
The patent changes the emission wavelength parameter directly at the LED active region by using quantum dots with specific bandgap energies that correspond to green or amber emission. This is achieved by controlling quantum dot size and composition, allowing direct emission without wavelength conversion and maximizing energy 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
These devices achieve enhanced efficiency and performance in emitting light in the desired wavelengths by facilitating radiative recombination of charge carriers in the quantum dots, overcoming the limitations of conventional LED structures.
Implementation Method 1
facilitating radiative recombination of charge carriers in the quantum dots
Implementation Method 2
the linkers can comprise the reaction product of a click chemistry reaction
Data Source
AI summary
In one aspect, light emitting devices are described herein. In some embodiments, a light emitting device described herein comprises an inorganic semiconductor substrate and a layer of quantum dots (QDs) covalently bonded to the inorganic semiconductor substrate. Such a device may further comprise an electrode and an overlayer positioned between the electrode and the layer of QDs. Moreover, the overlayer can be immediately adjacent to and in contact with the layer of QDs. Further, in some cases, the layer of QDs is a close-packed layer of QDs. Additionally, the light emitting device can be a green-emitting light emitting diode (LED) or an amber-emitting LED.