Quantum Dot Light-Emitting Diodes With Wavelength Difference Control
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Solution Overview
Problem
The variability in photoelectric properties among different batches of quantum dot materials synthesized using the same formulation leads to deviations in luminescence wavelength and full width at half-maximum, complicating the process and reducing production efficiency in quantum dot light-emitting diodes.
Innovation Solution
A quantum dot light-emitting diode and film are manufactured using quantum dots with minimal differences in photoelectric properties, specifically by combining quantum dots with photoluminescence peak wavelengths differing by no more than 10 nm, and adjusting mass fractions and full widths at half-maximum to enhance fluorescence and narrow the electroluminescence peak.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If quantum dot materials are synthesized by high-temperature thermal injection process or alternating adsorption of ion layers, then desired emission wavelength and narrow size distribution are obtained, but different batches deviate in light-emitting wavelength and size distribution, increasing process difficulty and reducing production efficiency
Solution Approach 1:
The patent controls the photoluminescence peak wavelength difference between quantum dots to be ≤10 nm, establishing a specific parameter threshold that ensures consistent photoelectric properties across batches while enabling standardized manufacturing processes
Solution Approach 2:
The patent requires quantum dots in the light-emitting layer to have homogeneous photoelectric properties with photoluminescence peak wavelengths differing by no more than 10 nm, ensuring uniform performance across different batches and eliminating the need for batch-specific process adjustments
2Adaptability or versatility
If different batches of quantum dot materials are used, then variety in photoelectric properties is achieved, but process adjustment is required for each batch, increasing process complexity
Solution Approach 1:
The patent establishes a controlled parameter range (photoluminescence peak wavelength difference ≤10 nm) that allows for acceptable photoelectric property variation while maintaining process standardization, avoiding the need for complex batch-specific adjustments
Solution Approach 2:
The patent applies different mass fractions to quantum dots with slightly different photoluminescence peak wavelengths (within 10 nm) to optimize local photoelectric properties in the light-emitting layer, achieving enhanced fluorescence and monochromaticity without increasing overall process complexity
3Illumination intensity
If quantum dots with larger photoluminescence peak wavelength differences are used, then broader emission spectrum is achieved, but color purity and monochromaticity are reduced
Solution Approach 1:
The patent strictly limits the photoluminescence peak wavelength difference to ≤10 nm, prioritizing color purity and monochromaticity over broad emission spectrum, which is appropriate for high-quality display applications requiring precise color control
Solution Approach 2:
The patent uses quantum dots with narrowly controlled photoluminescence peak wavelength differences (≤10 nm) to achieve high color purity in the light-emitting layer, ensuring that each quantum dot contributes to a monochromatic emission profile
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
This approach reduces process complexity, improves production efficiency, and achieves stable photoelectric performances with enhanced fluorescence and monochromaticity by ensuring the electroluminescence peaks of the quantum dot light-emitting layer have higher color purity and a narrower full width at half-maximum.
Implementation Method 1
an absolute value of a difference between a photoluminescence peak wavelength of the first quantum dot and a photoluminescence peak wavelength of the second quantum dot is less than or equal to 10 nm
Data Source
AI summary
The present disclosure provides a quantum dot light-emitting diode, a manufacturing method thereof, and a quantum dot film. The quantum dot light-emitting diode includes a first electrode, a second electrode, and a quantum dot light-emitting layer. The quantum dot light-emitting layer is disposed between the first electrode and the second electrode. The quantum dot light-emitting layer includes a first quantum dot and a second quantum dot, and an absolute value of a difference between a photoluminescence peak wavelength of the first quantum dot and a photoluminescence peak wavelength of the second quantum dot is less than or equal to 10 nm.