Light Emitting Device Current Blocking Layer
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Solution Overview
Problem
Conventional light emitting devices suffer from reduced efficiency due to light absorption by the second electrode, leading to degraded performance.
Innovation Solution
Incorporation of a current blocking layer and a light-transmitting conductive layer with a point contact structure, where the first and second electrodes make contact with the first conductive semiconductor layer and the light-transmitting conductive layer respectively, and an insulation layer is arranged to minimize light absorption, using distributed Bragg reflector (DBR) or omnidirectional reflector (ODR) configurations to reflect light away from the electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional light emitting device structure is used with electrodes directly contacting semiconductor layers, then the device structure is simple, but light absorption by the second electrode degrades light efficiency
Solution Approach 1:
A light-transmitting conductive layer is introduced as an intermediary between the second electrode and the second conductive semiconductor layer. This intermediary layer allows light to pass through while maintaining electrical contact, thereby reducing light absorption by the electrode and improving light efficiency without significantly complicating the device structure.
Solution Approach 2:
The device is segmented into multiple functional layers including a current blocking layer and a light-transmitting conductive layer. The current blocking layer is divided into a first current blocking layer and a second current blocking layer positioned at different locations. This segmentation allows each layer to perform its specific function optimally while collectively improving overall light efficiency.
2Loss of energy
If current blocking layers and light-transmitting conductive layers are added to reduce light absorption, then light efficiency is improved, but the device structure becomes more complex
Solution Approach 1:
The light-transmitting conductive layer serves multiple functions simultaneously: it acts as an electrical contact layer for current extraction, a light-transmitting window for light output, and a structural support layer. This multi-functionality reduces the need for separate dedicated layers, thereby improving light efficiency without proportionally increasing device complexity.
Solution Approach 2:
The device employs composite material structures where the current blocking layer and light-transmitting conductive layer are combined in specific configurations. These composite structures are designed to achieve optimal balance between electrical performance and optical performance, reducing light absorption while maintaining manageable device complexity through integrated material design.
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
This configuration enhances light efficiency by reducing absorption of light in the blue wavelength region, maintaining similar wavelength distributions while improving optical power output compared to conventional devices.
Implementation Method 1
an insulation layer is arranged to minimize light absorption, using distributed Bragg reflector (DBR) or omnidirectional reflector (ODR) configurations to reflect light away from the electrodes
Data Source
Figure 1~2a
Figure 2b~3a
Figure 3b~3c
AI summary
Disclosed is a light emitting device which includes a light emitting structure (220) comprising a first conductive type semiconductor layer (222), an active layer (224), and a second conductive type semiconductor layer (226); a first current blocking layer (232) and a second current blocking layer (236) arranged on the light emitting structure to be separated from each other; a light-transmitting conductive layer (240) arranged on the the first current blocking layer and the second current blocking layer and the light emitting structure; a first electrode (260) and a second electrode (270) electrically coupled to the first semiconductor layer and the second conductive semiconductor layer, respectively; and an insulation layer (250) arranged between the first electrode and the first current blocking layer and between the second electrode and the second current blocking layer.