Light Emitting Element Structure for Oxygen Barrier and Light Reflection
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Solution Overview
Problem
Existing light emitting elements face challenges in reliability and light emission efficiency, particularly due to issues with oxygen diffusion and light loss.
Innovation Solution
A light emitting element design featuring semiconductor layers surrounded by a multi-insulating film, a low refractive index film, and a reflective film, with specific oxide materials and thicknesses to enhance protection and reflectivity, improving the reliability and light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single insulating film is used to surround semiconductor layers, then the structure is simple, but oxygen diffusion protection is insufficient
Solution Approach 1:
The insulating film is segmented into three distinct layers (first insulating film, second insulating film, third insulating film) with different materials and functions. Each layer provides specific protection against oxygen diffusion, with the first and third films having high dissociation energy to block oxygen and the second film providing additional insulation, collectively achieving superior oxygen barrier performance.
Solution Approach 2:
The multi-insulating film employs composite material structure combining different oxide materials (e.g., ZrO2, HfO2, Al2O3, SiO2) with complementary properties. This composite approach leverages the high dissociation energy of certain oxides for oxygen blocking while maintaining electrical insulation properties, solving the contradiction between protection effectiveness and structural simplicity.
2Productivity
If light emitting elements are used in display devices, then display functionality is achieved, but light loss reduces emission efficiency
Solution Approach 1:
The patent converts the harmful light loss into a beneficial effect by introducing a reflective film that captures lost light and redirects it through the light emitting layer. This transforms energy that would have been wasted into useful light output, effectively converting a negative factor (light loss) into a positive contribution to emission efficiency.
Solution Approach 2:
The reflective film creates a periodic light interaction pattern where light that passes through the light emitting layer is reflected back and passes through again, enabling multiple opportunities for light emission from the same energy input, thereby improving overall light emission efficiency.
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 design enhances the reliability and light emission efficiency of the light emitting elements by reducing oxygen diffusion and maximizing light reflection, leading to improved performance.
Implementation Method 1
a multi-insulating film including a first insulating film, a second insulating film, and a third insulating film sequentially surrounding side surfaces of the semiconductor layers
Implementation Method 2
a reflective film surrounding the low refractive index film and including metal
Implementation Method 3
a low refractive index film surrounding the multi-insulating film
Data Source
AI summary
A light emitting element according to an embodiment includes semiconductor layers including a first semiconductor layer, a light emitting layer, and a second semiconductor layer. The light emitting element further includes a multi-insulating film including a first insulating film, a second insulating film, and a third insulating film sequentially surrounding side surfaces of the semiconductor layers, a low refractive index film surrounding the multi-insulating film and having a thickness greater than a thickness of the multi-insulating film, and a reflective film surrounding the low refractive index film and including metal.