Light-Emitting Device Oxidation-Resistant Layer and Block Layer
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Solution Overview
Problem
Existing light-emitting devices face challenges in preventing oxidation and electrical continuity issues, particularly at high resolutions where crosstalk occurs, narrowing the displayable color gamut and affecting the reliability and convenience of light-emitting apparatuses.
Innovation Solution
A light-emitting device structure incorporating an anode and cathode with an EL layer sandwiched in between, featuring an oxidation-resistant layer and a block layer that includes heterocyclic compounds to protect the EL layer from oxidation and prevent electrical continuity between electrodes, thereby enhancing electron injection properties and structural versatility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the EL layer is exposed to the atmosphere during manufacturing, then the manufacturing process becomes simpler, but oxidation of the EL layer occurs
Solution Approach 1:
An oxidation-resistant layer is formed on the EL layer before the EL layer is exposed to the atmosphere during manufacturing. This preliminary protective action prevents oxidation from occurring when the device is exposed to air, allowing simpler manufacturing processes while maintaining reliability.
Solution Approach 2:
The oxidation-resistant layer acts as an intermediary between the EL layer and the atmosphere. It provides a protective barrier that prevents direct contact between oxygen in the air and the EL layer, thus preventing oxidation while allowing the manufacturing process to proceed with atmospheric exposure.
2Device complexity
If the second electrode is in direct contact with the side surface of the EL layer, then the device structure becomes simpler, but electrical continuity between electrodes occurs causing short circuits
Solution Approach 1:
A block layer is introduced as an intermediary between the second electrode and the side surface of the EL layer. This block layer, made of heterocyclic compounds with appropriate electrical properties, prevents direct electrical contact that would cause short circuits while maintaining a relatively simple overall device structure.
Solution Approach 2:
The block layer is applied specifically to the side surface region where electrical insulation is needed, rather than uniformly throughout the entire device. This localized approach provides the necessary electrical insulation to prevent short circuits while minimizing the overall structural complexity and material usage.
3Reliability
If a block layer with heterocyclic compounds is added to protect the EL layer side surface, then electrical insulation and protection are improved, but device complexity increases
Solution Approach 1:
The block layer is formed using heterocyclic compounds with specifically selected electrical parameters (conductivity, work function) that match the requirements for electrical insulation while maintaining good interface properties with adjacent layers. By optimizing these material parameters, the block layer provides effective protection with minimal impact on overall device complexity.
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 protects the EL layer from oxidation, prevents short circuits, and improves electron injection, resulting in a reliable and convenient light-emitting device with enhanced color gamut and resolution capabilities.
Implementation Method 1
The oxidation-resistant layer can prevent oxidation of the EL layer even in the case where the EL layer is exposed to the atmosphere
Implementation Method 2
the block layer can prevent electrical continuity between the first electrode and the second electrode
Data Source
AI summary
A novel light-emitting device that is highly convenient, useful, or reliable is provided. The light-emitting device includes an anode over a cathode with an EL layer sandwiched therebetween. The EL layer includes at least a light-emitting layer and an oxidation-resistant layer over the light-emitting layer. The EL layer has a side surface. The light-emitting device includes a block layer in contact with a top surface and the side surface of the EL layer. The cathode is in contact with the side surface of the EL layer with the block layer therebetween. The block layer includes a heterocyclic compound. In the light-emitting device with the above structure, the oxidation-resistant layer may include any one or a plurality of oxides of metals belonging to Group 4 to Group 8 of the periodic table and an organic compound having an electron-withdrawing group.