Quantum Dot LED Packaging via Organic Solvent Mediator
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Solution Overview
Problem
Current LED backlight technologies face challenges in achieving high color gamut values due to the difficulty of mixing and agglomerating QD phosphor powder with packaging glue, leading to low excitation efficiency and high phosphor powder concentrations, which complicates packaging operations and increases product reject ratios.
Innovation Solution
A method involving the use of organic solvents to create clear QD solutions, mixing red and blue light QD solutions with packaging glue, and vacuum deaeration to produce a uniformly mixed phosphor glue, which is then combined with green light rare earth phosphor powder and applied to LED stents with ultraviolet chips to achieve high color gamut white light LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If QD phosphor powder is directly mixed with packaging glue, then high color gamut white light is achieved, but the QD phosphor powder agglomerates and fails to mix uniformly
Solution Approach 1:
The patent introduces an organic solvent as an intermediary substance to dissolve QD phosphor powder and create a stable colloidal solution. This colloidal solution serves as a mediator between the QD phosphor powder and packaging glue, enabling uniform distribution without agglomeration. The solvent molecules interact with QD surfaces to prevent aggregation, allowing the QDs to remain dispersed and stable when mixed with packaging glue.
Solution Approach 2:
The patent changes the physical and chemical parameters of QD phosphor powder by converting it from a solid powder state to a colloidal solution state through dissolution in organic solvent. This parameter change includes altering the aggregation state, surface properties, and dispersibility of QDs, transforming them from a form that agglomerates in packaging glue to a form that remains uniformly dispersed.
2Use of energy by moving object
If high concentration of phosphor powder is used to achieve high color gamut, then excitation efficiency improves, but packaging operation difficulty increases and product reject ratio increases
Solution Approach 1:
The patent changes the concentration parameter by creating colloidal solutions with optimized QD concentrations in organic solvents. This allows achieving high effective QD concentration for excitation efficiency while maintaining fluidity and workability for easy packaging operations. The colloidal form enables precise control of QD distribution without the handling difficulties associated with high-concentration solid powder mixtures.
3Illumination intensity
If QD phosphor powder is packaged directly in LED beads, then high color gamut white light is achieved, but impurities destroy packaging glue and prevent solidification
Solution Approach 1:
The organic solvent acts as a protective intermediary between QD phosphor powder and packaging glue. The solvent forms a stable colloidal environment that isolates QD particles from direct contact with packaging glue, preventing impurities from destroying the glue structure. This intermediary layer allows the packaging glue to solidify properly while still enabling high color gamut performance.
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 method significantly increases the color gamut value of LED backlight beads to above NTSC 92%, reduces packaging difficulties, and enables mass industrial production by improving the uniformity and reliability of QD phosphor powder integration.
Implementation Method 1
perform ultrasonic processing respectively for said red light QD solution and blue light QD solution to obtain clear QD solutions
Implementation Method 2
mix the mixture obtained in step d in vacuum for deaeration to remove the organic solvent from the mixed solution obtained in step d
Data Source
AI summary
A packaging method of high color gamut white light quantum dot (QD) light emitting diodes (LEDs). The method includes: a. add an organic solvent to red light QD phosphor powder and blue light QD phosphor powder, respectively; b. perform ultrasonic processing for the solutions; c. prepare a mixed QD solution; d. add mixed packaging glue to the mixed QD solution; e. remove the organic solvent; f. add green light rare earth phosphor powder; g. drip the mixed phosphor glue into an LED stent fixed with ultraviolet chips, and bake and solidify the LED stent to obtain LED beads. The method produces high gamut white light LEDs and greatly improves the color gamut value of LED backlight beads, which reaches above NTSC 92%. With an organic solvent as a connecting bridge, QDs and the packaging glue are mixed uniformly, QD phosphor powder failure resulted from agglomeration is avoided, and quality of high color gamut white light LED beads is significantly improved.