Multilayer Insulating Film for Light Emitters With Carbon Gradient
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing light emitting elements and display devices face reliability issues due to the impact of carbon content in insulating films, which affects the film quality and efficiency.
Innovation Solution
A light emitting element with a multilayer insulating film structure, where one insulating film in contact with the active layer has a carbon content of 3% to 30%, and the carbon content in outer films is lower, using oxides like ZrO2, HfO2, La2O3, Ta2O5, Y2O3, Nb2O5, and TiO2, to improve film quality and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the carbon content in insulating films is high, then the film formation is easier, but the reliability and luminance maintenance rate deteriorate
Solution Approach 1:
The insulating film is divided into multiple layers with different carbon content. The first insulating film layer has a carbon content of 3% to 30% (easier to form), while the second insulating film layer has a carbon content of 0% to 3% (higher reliability). This segmentation allows each layer to optimize for its specific function without compromising the other.
Solution Approach 2:
Different regions of the insulating film structure have different carbon content characteristics. The first insulating film layer (closer to the light emitting structure) has higher carbon content for ease of formation, while the second insulating film layer (outer layer) has lower carbon content for reliability. This local quality differentiation resolves the contradiction between ease of manufacture and reliability.
2Device complexity
If a single layer insulating film is used, then the device complexity is reduced, but the luminance maintenance rate and reliability deteriorate
Solution Approach 1:
The insulating film is segmented into two distinct layers: a first insulating film layer with carbon content of 3% to 30% and a second insulating film layer with carbon content of 0% to 3%. This segmentation enables the structure to achieve high luminance maintenance rates (90% or more after 300 hours) by combining the formation ease of higher-carbon materials with the reliability of lower-carbon materials.
Solution Approach 2:
The insulating film uses a composite structure of two different material compositions. The first layer uses materials with higher carbon content (easier to deposit), while the second layer uses materials with lower carbon content (better performance). This composite approach achieves both manufacturability and high reliability without excessive complexity.
Data Source
AI summary
A light emitting element includes a first semiconductor layer doped with an N-type dopant, a second semiconductor layer disposed on the first semiconductor layer and doped with a P-type dopant, an active layer disposed between the first semiconductor layer and the second semiconductor layer, an electrode layer disposed on the second semiconductor layer, and a multilayer insulating film surrounding at least an outer surface of the active layer and including two or more layers, wherein any one insulating film of the multilayer insulating film that is in contact with at least the outer surface of the active layer has a carbon content of about 3% to about 30%.