Rod-Aligned Color Conversion Layer for Polarized Light Emission
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Solution Overview
Problem
Rod-type light emitting elements emit linearly polarized light, which is absorbed and emitted in a Lambertian form by quantum dots, leading to deteriorated emission efficiency in light emitting devices.
Innovation Solution
The alignment of rod-shaped light emitting elements and color conversion elements, such as quantum rods, is parallel or intersecting at a predetermined angle, enhancing light absorption and emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If quantum dots are used as color conversion elements to convert linearly polarized light from rod-type light emitting elements, then color conversion function is achieved, but emission efficiency deteriorates due to Lambertian emission pattern
Solution Approach 1:
The patent changes the shape parameter of color conversion elements from spherical quantum dots to rod-shaped quantum rods. This geometric parameter change enables the color conversion elements to maintain directional light emission properties while performing color conversion, thereby improving emission efficiency without requiring complex alignment control mechanisms.
2Reliability
If rod-type light emitting elements are used to emit linearly polarized light, then light emission function is achieved, but color conversion efficiency deteriorates when using conventional quantum dots
Solution Approach 1:
The patent applies homogeneity by making both the light emitting elements and color conversion elements have the same rod shape. This homogeneous geometric structure ensures consistent optical properties throughout the device, allowing the rod-shaped quantum rods to efficiently convert the linearly polarized light from rod-type light emitting elements while maintaining stable light emission.
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
Improved light absorption and emission efficiency in light emitting devices by aligning rod-type color conversion elements with light emitting elements, resulting in enhanced performance.
Implementation Method 1
rod-type light emitting elements emit linearly polarized light, and quantum dots generally used as the color conversion elements absorb the linearly polarized light
Implementation Method 2
quantum dots generally used as the color conversion elements absorb the linearly polarized light and emit light in a Lambertian form
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
A light emitting device includes a substrate. A light emitting element layer is disposed on the substrate, and includes light emitting elements having a rod shape. A color conversion layer is disposed on the light emitting element layer, and includes color conversion elements having a rod shape. A second alignment direction of the color conversion elements is substantially identical to a first alignment direction of the light emitting elements.