Graphyne-Doped Interface Layer for PeLED Hole Injection
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Solution Overview
Problem
Perovskite-type light-emitting diodes (PeLEDs) face poor hole injection and transport performance due to a high potential barrier between carbon electrode materials and the perovskite light-emitting layer, resulting in low luminous efficiency.
Innovation Solution
A light-emitting device with a first interface-modifying layer composed of a thiophene-based polymer doped with graphyne, featuring a doping ratio that gradually decreases from the light-emitting layer to the anode layer, along with additional interface-modifying layers to optimize hole injection and transport, is introduced. The device includes an anode and cathode layer with the thiophene-based polymer-graphyne blend layer formed under an electric field, enhancing the hole injection and transport performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If carbon electrode material is used as an electrode material for perovskite optoelectronic devices, then the device structure is simplified and manufacturing is easier, but the potential barrier between the carbon electrode and the perovskite light-emitting layer is high, resulting in poor hole injection and transport performance
Solution Approach 1:
The patent introduces an interface-modifying layer composed of thiophene-based polymer and graphyne as an intermediary between the carbon electrode and perovskite light-emitting layer. This intermediary layer reduces the potential barrier and facilitates hole injection and transport, resolving the contradiction between using simple carbon electrodes and achieving good hole injection performance.
Solution Approach 2:
The interface-modifying layer uses a composite material system combining thiophene-based polymer and graphyne. This composite structure leverages the complementary properties of both materials to optimize hole injection and transport while maintaining the simplicity of the carbon electrode structure.
2Ease of manufacture
If the doping ratio of graphyne is uniformly distributed in the interface-modifying layer, then the manufacturing process is simpler, but the hole injection barrier cannot be effectively reduced across different regions
Solution Approach 1:
The patent implements a non-uniform doping ratio distribution where the graphyne doping ratio varies across different regions of the interface-modifying layer. Specifically, the doping ratio is higher near the perovskite interface and lower near the carbon electrode, optimizing hole injection at each interface locally.
Solution Approach 2:
The patent changes the doping ratio parameter of graphyne across different regions of the interface-modifying layer. By controlling the doping ratio to decrease from the perovskite interface toward the carbon electrode, the patent optimizes the energy level alignment and hole transport properties at different locations.
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 the hole injection barrier and improves luminous efficiency by lowering the highest occupied molecular orbital energy level, thereby enhancing the performance of the light-emitting device and avoiding fluorescence quenching.
Implementation Method 1
a first interface-modifying layer disposed between the light-emitting layer and the anode layer. The first interface-modifying layer includes a thiophene-based polymer and a graphyne doped in the thiophene-based polymer
Implementation Method 2
The device includes an anode and cathode layer with the thiophene-based polymer-graphyne blend layer formed under an electric field, enhancing the hole injection and transport performance
Data Source
AI summary
Disclosed is a light-emitting device, a preparation method, and a display panel. The light-emitting device includes an anode layer and a cathode layer disposed opposite to each other, a light-emitting layer disposed between the anode layer and the cathode layer, and a first interface-modifying layer disposed between the light-emitting layer and the anode layer. The first interface-modifying layer includes a thiophene-based polymer and a graphyne doped in the thiophene-based polymer and includes a first sub-layer close to the light-emitting layer and a second sub-layer close to the anode layer, and a doping ratio of the graphyne in the first sub-layer is greater than a doping ratio of the graphyne in the second sub-layer.