Organic Light Emitting Lighting Device With Quantum Dots
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Solution Overview
Problem
Conventional lighting devices produce yellow light that appears bluish under photopic vision due to inadequate color mixing of green and red lights, leading to suboptimal visual perception.
Innovation Solution
A lighting device incorporating a light emitting element with organic light emitting materials and a light converting element featuring quantum dots, which emits a light spectrum with a main peak between 520 nm and 780 nm and a sub peak between 400 nm and 470 nm, with a specific intensity ratio, to reduce blue light intensity and enhance color mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional green and red light mixing is used to produce yellow light, then the lighting device can achieve yellow color output, but the yellow light appears bluish under photopic vision condition
Solution Approach 1:
The patent changes the spectral parameters by introducing a specific sub peak in the 400-470 nm range with controlled intensity ratio (0.05%-2% relative to main peak), and adjusts the main peak position to 520-780 nm. This parameter optimization eliminates the bluish tint while maintaining yellow light output, directly resolving the technical contradiction between achieving yellow color and avoiding bluish appearance.
Solution Approach 2:
The patent employs a composite light converting element containing multiple quantum dots with different emission characteristics. This composite quantum dot structure enables precise spectral control by combining the emission properties of individual quantum dots, achieving the desired light spectrum with main peak at 520-780 nm and controlled sub peak at 400-470 nm, thus producing yellow light without bluish tint.
2Manufacturing precision
If additional yellow lighting units are added to correct color perception, then the color accuracy can be improved, but the device complexity and structure increase
Solution Approach 1:
The patent makes the light converting element multi-functional by integrating color conversion and spectral optimization functions into a single quantum dot-based component. This element simultaneously converts blue/UV light to yellow and controls the spectral distribution to eliminate bluish tint, eliminating the need for separate yellow lighting units while maintaining color accuracy.
Solution Approach 2:
The patent merges the functions of multiple lighting units into a single integrated lighting unit. By combining the light emitting element with the quantum dot light converting element, the system achieves both yellow light production and bluish tint elimination in one unified structure, reducing device complexity while maintaining color accuracy.
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 reduces the bluish tint of yellow light, improving visual perception by adjusting the color gamut and eliminating the need for additional yellow lighting units, while maintaining the yellow region of the color space for eye-protection and enhanced visual experience.
Implementation Method 1
the light emitting element includes an organic light emitting material
Implementation Method 2
the light converting element includes a plurality of quantum dots
Data Source
AI summary
A lighting device includes a lighting unit including a light emitting element and a light converting element. The light emitting element includes an organic light emitting material, and the light converting element includes quantum dots. The lighting unit emits an output light having a light spectrum, the light spectrum in a range from 520 nm to 780 nm has a main peak, and the light spectrum in a range from 400 nm to 470 nm has a sub peak with a maximum intensity at a first wavelength. A first sub peak integral is an integral of the light spectrum calculated from the first wavelength minus 20 nm to the first wavelength, an intensity integral of a main wave comprising the main peak in the light spectrum is calculated from 521 nm to 780 nm, and a ratio of the first sub peak integral to the intensity integral is in a range from 0.05% to 2%.