Vehicle Taillight Quantum Dot Optics for Brightness and Color Stability
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Solution Overview
Problem
Existing light-emitting devices for vehicle taillights suffer from low luminous efficiency, short service life, and poor color cast performance, particularly when attempting to balance brightness and service life.
Innovation Solution
A light-emitting device comprising at least one light-emitting element emitting light with a wavelength of 500 nm to 580 nm, a red light quantum dot wavelength conversion layer, and a first optical structure with optical elements configured to focus light perpendicular to the backplane, enhancing luminous efficiency and color cast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the driving current is increased to improve brightness, then the brightness of the light-emitting device is improved, but the service life is reduced
Solution Approach 1:
The patent changes the wavelength parameter of the light-emitting element from conventional blue (450-480nm) to green (500-580nm), which has lower energy. This parameter change allows the quantum dot layer to achieve higher luminous efficiency at lower driving currents, improving service life while maintaining brightness
Solution Approach 2:
The patent uses a composite structure combining a green light-emitting element with a red quantum dot wavelength conversion layer. This composite material system achieves higher overall luminous efficiency (15%-25% improvement) compared to conventional blue LED + red quantum dot structures, allowing operation at lower currents for extended service life
2Device complexity
If a conventional blue light-emitting element is used to excite the red quantum dot layer, then the device structure is simple, but the luminous efficiency is low and service life is reduced
Solution Approach 1:
The patent changes the excitation light wavelength from blue (450-480nm) to green (500-580nm). Green light has lower energy than blue light, reducing the energy mismatch with the red quantum dot emission band. This parameter change improves energy conversion efficiency and reduces driving current requirements, extending service life while maintaining device structure simplicity
3Illumination intensity
If the driving current is increased to achieve high brightness, then the brightness requirement is met, but the color cast varies significantly within a certain angle range
Solution Approach 1:
The patent changes the light-emitting element wavelength to green (500-580nm), which better matches the absorption characteristics of red quantum dots. This improves the spectral overlap and luminous efficiency, achieving high brightness without excessive current that would cause color shift and viewing angle dependence
Solution Approach 2:
The green light-emitting element combined with red quantum dot layer creates a more efficient energy transfer system. This composite structure achieves high luminous efficiency and stable color cast across viewing angles without requiring high driving currents that would exacerbate color variation
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 proposed solution achieves higher luminous efficiency, longer service life, and improved color cast performance, with a 15% to 25% improvement in luminous efficiency and a service life of up to 8000 hours, while maintaining consistent color cast across various viewing angles.
Implementation Method 1
a wavelength conversion layer located on one side of the at least one light-emitting element away from the backplane and configured to emit a second light with a different color from the first light under excitation of the first light; the wavelength conversion layer is a red light quantum dot layer
Implementation Method 2
a first optical structure located on one side of the wavelength conversion layer away from the backplane, and comprising one or more optical elements, each of the one or more optical elements being configured to focus the second light along a direction perpendicular to the backplane
Data Source
AI summary
The present disclosure provides a light-emitting device and a manufacturing method thereof, a taillight and a vehicle. The light-emitting device includes at least one light-emitting element located on one side of a backplane, wherein a wavelength of a first light emitted by each light-emitting element is 500 nm to 580 nm; a wavelength conversion layer located on one side of the at least one light-emitting element away from the backplane and configured to emit a second light with a different color from the first light under the excitation of the first light; and a first optical structure located on one side of the wavelength conversion layer away from the backplane, and including one or more optical elements, each of which is configured to focus the second light along a direction perpendicular to the backplane.