Light-Emitting Element Insulating Layer for Zn Cathode Protection
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Solution Overview
Problem
Existing light-emitting elements are prone to deterioration due to chemical reactions between the functional layer containing Zn and the cathode, which can lead to corrosion and reduced efficiency.
Innovation Solution
Incorporating an organic layer with insulating properties between the functional layer and the cathode, containing Zn and O elements, to prevent diffusion of metal elements and reduce chemical reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a functional layer containing Zn is positioned between the light-emitting layer and the cathode, then the luminous efficiency is improved, but the risk of deterioration increases due to chemical reactions between Zn and the cathode
Solution Approach 1:
An organic layer with insulating properties is introduced as an intermediary between the functional layer containing Zn and the cathode. This intermediate layer prevents direct contact and chemical reactions between Zn and the cathode, thereby reducing the risk of deterioration while maintaining the electron transport function of the functional layer.
Solution Approach 2:
The original single-layer structure between the light-emitting layer and cathode is segmented into two distinct layers: a functional layer containing Zn for electron transport and an organic insulating layer for protection. This segmentation allows each layer to perform its specific function optimally without causing deterioration.
2Device complexity
If the functional layer and cathode are in direct contact, then the device structure is simplified, but chemical reactions occur leading to corrosion and reduced efficiency
Solution Approach 1:
An organic insulating layer is positioned between the functional layer and cathode to act as a protective intermediary. This prevents harmful chemical reactions and corrosion between Zn-containing functional layer and the cathode, eliminating the harmful factors while adding only one additional layer to the structure.
Data Source
AI summary
A light-emitting element includes an anode and a cathode, a light-emitting layer positioned between the anode and the cathode, a functional layer positioned between the light-emitting layer and the cathode, and containing Zn and O as elements, and an organic layer having insulating properties and being in contact with the functional layer and the cathode. The organic layer contains a polymer having a long alkyl chain.