Quantum Dot Light-Emitting Device Incident Light Scattering
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Solution Overview
Problem
Light-emitting devices with quantum dots exhibit significant in-plane variation in luminescence intensity, with higher intensity at the center and decreasing intensity towards the periphery due to the optical axis-dependent light emission from the light source.
Innovation Solution
Incorporating an incident light scattering part, which can be a light scattering material, a sintered body with grain boundaries, or an irregular surface, between the light source and the light-emitting part to scatter light uniformly across the device, reducing in-plane variation in luminescence intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light source emits light to excite quantum dots, then light emission occurs, but in-plane variation in luminescence intensity increases
Solution Approach 1:
A light scattering part is introduced as an intermediary component between the light source and the quantum dot-containing light-emitting part. This scattering part diffuses the incident light before it reaches the quantum dots, ensuring uniform excitation across the entire light-emitting area and eliminating the in-plane intensity variation caused by direct light incidence
Solution Approach 2:
The optical parameters of the light path are modified by introducing a light scattering part that changes the direction and distribution of incident light. This parameter change transforms the concentrated light distribution into a uniform distribution, achieving consistent luminescence intensity across the device surface
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 solution achieves a more uniform luminescence intensity distribution across the light-emitting device, enhancing light extraction efficiency and reducing peripheral luminescence intensity variations.
Implementation Method 1
The incident light scattering part scatters light incident on the light-emitting part
Data Source
AI summary
Provided is a light-emitting device with quantum dots that has a small in-plane variation in luminescence intensity. A light-emitting device (1) includes a light-emitting part (11), a cell (10), a light source (12), and an incident light scatting part. The light-emitting part (11) contains quantum dots. The cell (10) encapsulates the light-emitting part (11). The light source (12) emits light at a wavelength exciting the quantum dots to the light-emitting part (11). The incident light scatting part is disposed between the light source (12) and the light-emitting part (11). The incident light scatting part scatters light incident on the light-emitting part (11).