Light-Emitting Device Metal Compound Layer Flatness
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Solution Overview
Problem
In light-emitting devices with second electrodes arranged in a stripe pattern, the thin second metal-containing layer may lack flatness due to metal separation into islands, compromising the light transmitting property.
Innovation Solution
A light-emitting device structure that includes a substrate, a first electrode, an organic layer, a plurality of first metal-containing layers with light shielding properties, a metal compound-containing layer with light transmitting properties covering the first metal-containing layers, and a second metal-containing layer with light transmitting properties, where the metal compound-containing layer improves the flatness and conductivity of the second metal-containing layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the thickness of the second metal-containing layer is made relatively thin to maintain light transmitting property, then the light transmitting property is improved, but the flatness of the second metal-containing layer deteriorates due to metal separation into islands
Solution Approach 1:
A metal compound-containing layer is introduced between the first metal-containing layer and the second metal-containing layer. This intermediary layer prevents direct contact between the second metal-containing layer and the first metal-containing layer, thereby preventing metal diffusion and island formation while still allowing voltage to be supplied to the first metal-containing layer through the metal compound-containing layer.
Solution Approach 2:
The patent uses a composite structure consisting of multiple layers with different material properties: the metal compound-containing layer combines light-transmitting properties with electrical conductivity, while the second metal-containing layer provides voltage supply capability. This composite structure allows the second metal-containing layer to be made thin for light transmission while the metal compound-containing layer ensures flatness and proper voltage distribution.
2Reliability
If a second metal-containing layer is placed over the first metal-containing layers to supply voltage, then the electrical conductivity is improved, but the light transmitting property deteriorates due to the metal layer blocking light
Solution Approach 1:
The second metal-containing layer is made with a relatively thin thickness to reduce light blocking while maintaining electrical conductivity for voltage supply. The metal compound-containing layer also functions as a thin film that allows both light transmission and electrical conduction, resolving the contradiction between these two requirements.
Solution Approach 2:
The patent changes the thickness parameter of the second metal-containing layer to optimize the balance between electrical conductivity and light transmission. By controlling the thickness to be relatively thin, the layer can supply voltage effectively while minimizing light blocking, thus resolving the contradiction between these two opposing requirements.
Data Source
AI summary
A light-emitting device (10) includes a substrate (100), a first electrode (110), an organic layer (120), a plurality of first metal-containing layers (132), a metal compound-containing layer (134), and a second metal-containing layer (136). The first electrode (110) is located over the substrate (100), and has a light transmitting property. The organic layer (120) is located over the first electrode (110). The plurality of first metal-containing layers (132) are located over the organic layer (120), and has a light shielding property. The metal compound-containing layer (134) covers the plurality of first metal-containing layers (132), and has a light transmitting property. The second metal-containing layer (136) covers the metal compound-containing layer (134), and has a light transmitting property.