Multilayer Oxide Insulation for Oxygen-Resistant Light-Emitting Elements
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Solution Overview
Problem
Existing light-emitting elements and display devices face reliability issues due to oxygen ingress, which affects their performance and longevity.
Innovation Solution
A multilayer oxide insulating film structure is employed, comprising a first, second, and third insulating film with specific oxide compositions and thicknesses, designed to capture oxygen through oxygen vacancies at their interfaces, thereby enhancing the reliability of the light-emitting element and the display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single insulating film is used to protect the light-emitting element, then the structure is simple, but oxygen ingress occurs leading to reliability issues
Solution Approach 1:
The insulating film is segmented into multiple layers with different oxide compositions. The first insulating film contains an M1xOy type oxide, the second contains an M22xO(2y-1) type oxide, and the third contains an M3xOy type oxide. This segmentation allows each layer to contribute differently to oxygen barrier performance, resolving the contradiction between reliability and structural simplicity.
Solution Approach 2:
The patent employs a composite insulating film structure where layers with different oxide compositions are combined. The specific oxide combinations (M1xOy, M22xO(2y-1), M3xOy) create a composite material system with enhanced oxygen barrier properties compared to single-material films, addressing the reliability issue while maintaining reasonable structural complexity.
2Reliability
If the insulating film thickness is increased to block oxygen, then oxygen barrier performance improves, but the device size increases
Solution Approach 1:
Different regions of the insulating film structure have different oxide compositions optimized for specific functions. The first, second, and third insulating films contain different oxide types (M1xOy, M22xO(2y-1), M3xOy) that create local variations in oxygen barrier properties, allowing effective oxygen blocking with reduced overall thickness.
Solution Approach 2:
The composite oxide structure leverages the synergistic effects of different oxide materials to achieve superior oxygen barrier performance at thinner overall thickness. The specific oxide combinations create a multi-functional insulating system that blocks oxygen more effectively than single-material films of equivalent or greater thickness.
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 multilayer oxide insulating film effectively captures oxygen, improving the reliability and durability of the light-emitting element and the display device by reducing oxygen-induced deterioration.
Implementation Method 1
a first insulating film surrounding outer peripheral surfaces of the first semiconductor layer, the active layer and the second semiconductor layer and including an M1 x O y type oxide; a second insulating film surrounding the first insulating film and including an M2 2x O (2y-1) type oxide; a third insulating film surrounding the second insulating film and including an M3 x O y type oxide
Data Source
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AI summary
A light-emitting element according to an embodiment comprises: a first semiconductor layer, an active layer, and a second semiconductor layer, which are sequentially arranged in one direction; a first insulating film surrounding the outer peripheral surfaces of the first semiconductor layer, the active layer, and the second semiconductor layer and containing an M1xOy type oxide; a second insulating film surrounding the first insulating film and containing an M22xO(2y-1) type oxide; a third insulating film surrounding the second insulating film and containing an M3xOy type oxide; and a fourth insulating film surrounding the third insulating film, wherein M1, M2, and M3 may each be a metal material, and x and y may each be a natural number.