LED Chip Electron Channels Reduce Voltage and Boost Brightness
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Solution Overview
Problem
Conventional face-up LED chips with current blocking layers (CBLs) under electrodes suffer from increased driving voltages and reduced light-emitting efficiencies due to parasitic optical absorption and ineffective activation of multiple quantum wells (MQWs) underneath the electrodes.
Innovation Solution
The LED chip design includes a semiconductor material portion with a transparent conductive layer and a current blocking layer, featuring electron inflow and outflow channels that electrically interconnect electrodes across the current blocking layer, allowing for effective activation of MQWs and reducing operating voltage while enhancing brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If current blocking layers are inserted underneath the electrodes to reduce parasitic optical absorption, then optical absorption is reduced, but driving voltage increases and light-emitting efficiency decreases
Solution Approach 1:
The current blocking layer is segmented by creating electron inflow channels and outflow channels that penetrate through it. This segmentation allows the CBL to block parasitic current paths while still permitting electron transport through the channels, thereby reducing parasitic optical absorption without sacrificing light-emitting efficiency
Solution Approach 2:
The electron inflow channels and outflow channels act as intermediaries that facilitate electron transport across the current blocking layer. These channels provide dedicated pathways for electron flow, mediating between the electrode and the semiconductor layers while allowing the CBL to maintain its optical blocking function
2Object-affected harmful factors
If current blocking layers are inserted underneath the electrodes, then parasitic optical absorption is reduced, but driving voltage increases
Solution Approach 1:
The current blocking layer is segmented by creating electron inflow channels and outflow channels that penetrate through it. This segmentation allows the CBL to block parasitic current paths while still permitting electron transport through the channels, thereby reducing parasitic optical absorption without sacrificing light-emitting efficiency
Solution Approach 2:
The electron inflow channels and outflow channels act as intermediaries that facilitate electron transport across the current blocking layer. These channels provide dedicated pathways for electron flow, mediating between the electrode and the semiconductor layers while allowing the CBL to maintain its optical blocking function
3Object-affected harmful factors
If current blocking layers are inserted underneath the electrodes, then parasitic optical absorption is reduced, but light-emitting efficiency decreases
Solution Approach 1:
The current blocking layer is segmented by creating electron inflow channels and outflow channels that penetrate through it. This segmentation allows the CBL to block parasitic current paths while still permitting electron transport through the channels, thereby reducing parasitic optical absorption without sacrificing light-emitting efficiency
Solution Approach 2:
The electron inflow channels and outflow channels act as intermediaries that facilitate electron transport across the current blocking layer. These channels provide dedicated pathways for electron flow, mediating between the electrode and the semiconductor layers while allowing the CBL to maintain its optical blocking function
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 achieves a reduction in operating voltage by up to 10% and an increase in brightness by up to 10% compared to conventional LED chips, with lower current density and reduced droop effect, thereby improving light-emitting efficiency.
Implementation Method 1
a plurality of electron outflow channels that electrically interconnect at least one electrode and the semiconductor material portion across the transparent conductive layer and the current blocking layer
Implementation Method 2
Light-emitting diode (LED) chip
Implementation Method 3
light-emitting efficiencies
Data Source
AI summary
According to at least some embodiments of the present disclosure, a light-emitting diode (LED) chip includes a semiconductor material portion, a transparent conductive layer disposed above the semiconductor material portion, a current blocking layer disposed above the transparent conductive layer, one or more electrodes disposed above the current blocking layer, and a plurality of electron outflow channels that electrically interconnect at least one electrode and the semiconductor material portion across the transparent conductive layer and the current blocking layer.