Quantum Light Emitting Diode Prism Light Extraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Quantum light emitting diodes (QLEDs) face reduced brightness due to light loss from quantum particles emitting light from side surfaces, leading to decreased out-coupling efficiency and shorter lifetimes from thermal degradation.
Innovation Solution
Incorporating a light-amount enhancing layer with prism patterns that guide emitted light towards the emitting side, where quantum particles are positioned between adjacent prisms, enhancing light directionality and reducing losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantum particles are used in the emitting layer, then thermal stability and oxidation resistance are improved, but light loss from side surface emission reduces brightness
Solution Approach 1:
The patent converts the harmful side surface light emission into a beneficial effect by introducing a photonic crystal structure that transforms the lateral light into useful upward-directed light, thereby improving brightness while maintaining the thermal stability benefits of quantum particles
Solution Approach 2:
The patent introduces a new dimensional aspect by adding a photonic crystal layer with periodic structure that manipulates light propagation in three dimensions, redirecting light that would otherwise be lost sideways into the upward emission direction
2Adaptability or versatility
If quantum particles emit light from side surfaces, then light emission occurs in multiple directions, but out-coupling efficiency decreases
Solution Approach 1:
The photonic crystal structure converts the multi-directional light emission (which causes light loss) into a beneficial effect by selectively enhancing the upward-directed light components while suppressing lateral emission, thereby improving out-coupling efficiency
3Illumination intensity
If current density is increased to improve brightness, then brightness increases, but thermal degradation accelerates and lifetime reduces
Solution Approach 1:
The photonic crystal structure allows the device to achieve higher brightness with lower current density by improving light extraction efficiency, thereby reducing thermal load and extending device lifetime while maintaining high brightness output
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
Improves brightness and out-coupling efficiency by redirecting lateral light emissions towards the display side, thereby increasing the quantum light emitting diode's brightness and extending its operational lifespan.
Implementation Method 1
a light-amount enhancing layer having a structure configured to guide emitted light toward an emitting side
Data Source
Figure 1~2B
Figure 3A~3B
Figure 4~5
AI summary
A quantum light emitting diode (100) comprises a first electrode (110); a second electrode (120) facing the first electrode (110); a light-amount enhancing layer (170) between the first and second electrodes and having a structure guiding emitted light toward an emitting side; and an emitting material layer (150) between the light-amount enhancing layer (170) and the second electrode (120) and including a quantum particle (152) at the structure of the light-amount enhancing layer (170).