Light Emitting Device With Magnetic Field For Uniform Current
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional light emitting diodes (LEDs) face reduced light output efficiency due to non-uniform current density distribution and blocking of emitted light by non-transparent top electrodes, which obstructs light emission at the central region with the highest intensity.
Innovation Solution
Incorporating a magnetic material into the light emitting device to create a magnetic field that enhances the exciting binding energy of the light-emitting structure, thereby improving the internal quantum efficiency and luminance by uniformly distributing current and increasing the probability of carrier combination, even with non-transparent top electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a non-transparent top electrode is positioned at the center region of the light emitting area, then current density is concentrated at the center, but light emission is blocked at the central region
Solution Approach 1:
The top electrode is divided into multiple segments arranged in a specific pattern rather than being a single continuous electrode. This segmentation allows current to be distributed through multiple pathways while creating openings that enable light extraction from the high-current-density regions, resolving the contradiction between current concentration and light emission.
2Productivity
If current density is non-uniformly distributed, then some regions emit more light, but overall light uniformity is reduced
Solution Approach 1:
The electrode structure is designed with spatially varying properties - certain regions have higher current density for enhanced light generation, while other regions are optimized for light extraction. This local differentiation allows simultaneous optimization of both light production efficiency and spatial uniformity through the segmented configuration that enables different zones to serve different functions.
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 application of a magnetic field in the light emitting device significantly enhances light emitting efficiency and luminance by ensuring uniform current distribution and increased carrier combination, even with non-transparent top electrodes, leading to improved optoelectronic transformation.
Implementation Method 1
The magnetic material is coupled with the light-emitting structure to produce a magnetic field in the light-emitting structure
Implementation Method 2
Light emitting device, such as a light emitting diode (LED) can emit light due to the driving of electron current through the active layer of the light emitting diode
Implementation Method 3
Light emitting device, such as a light emitting diode (LED) can emit light due to the driving of electron current through the active layer
Data Source
AI summary
A light emitting device is provided, which includes a light-emitting structure and a magnetic material. The light-emitting structure has an exciting binding energy of a bandgap. The magnetic material is coupled with the light-emitting structure to produce a magnetic field in the light-emitting structure. The exciting binding energy may be higher than about 25.8 meV at room temperature.