Quantum dot fluorescent material, its preparation method and LED fill/flash lamp
A fluorescent material and quantum dot technology, applied in the field of supplementary/flash lamps, can solve problems such as limited utilization of visible light energy, unsuitable for excessive exploitation, poor image color quality, etc., to achieve improved color fidelity, good light stability, and light efficiency strong effect
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preparation example Construction
[0065] When the fluorescent material is composed of quantum dots, the preparation method of the quantum dot fluorescent material comprises:
[0066] Step 1, mixing the quantum dots with different emission wavelengths by mechanical stirring or ultrasonic oscillation to obtain fluorescent materials;
[0067] Step 2, mixing the fluorescent material, resin, and filler by mechanical stirring or ultrasonic oscillation to obtain a mixture;
[0068] Step 3: Vacuumize the mixture for 5-180 min under the conditions of 20-30° C. and 0.01-0.3 MPa to obtain a quantum dot fluorescent material.
[0069] Preferably, the mixture is evacuated at 25°C and 0.1 MPa for 10-60 min to obtain the quantum dot fluorescent material.
[0070] When the fluorescent material is composed of a composite of quantum dots and non-quantum dot fluorescent materials, the preparation method of the quantum dot fluorescent material includes:
[0071] Step 1, mixing the quantum dots and non-quantum dot fluorescent mat...
Embodiment 1
[0116] According to the literature, one-step synthesis of quantum dots with chemical composition gradients (Single-step synthesis of quantum dots with chemical composition gradients, Chemistry of Materials, 2008, 20, 531-539.) was used to prepare red quantum dots with an emission wavelength of 610nm. Put 0.4mmol cadmium oxide, 4mmol zinc acetate, 17.6mmol oleic acid and 20ml 1-octadecene into a 100ml flask and mix, heat to 150°C and vacuumize for 20 minutes, then heat the mixed liquid to 310°C under nitrogen atmosphere, Inject 3ml of trioctylphosphine solution dissolved with 1mmol of selenium powder and 2.3mmol of sulfur powder into the mixed liquid in the flask, continue the reaction at 300°C for 90 minutes, add acetone after the system is cooled to room temperature, centrifuge to obtain a precipitate, and then use chloroform Dissolve the precipitate, repeat the precipitation and dissolution three times, and finally obtain the quantum dot solid, or disperse the quantum dot sol...
Embodiment 2
[0118] According to the literature, CdSeZnS high-efficiency light-emitting diodes with chemical composition gradient structure (Highly efficient green-light-emitting diodes based on CdSeZnS quantum dots with a chemical-composition gradient, Advanced Materials, 2009, 21, 1690-1694.) were prepared with an emission wavelength of 524nm green quantum dots. Put 0.1mmol of cadmium oxide, 4mmol of zinc acetate, 5ml of oleic acid, and 15ml of 1-octadecene into a 100ml flask and mix them, heat to 150°C and vacuumize for 30 minutes, then heat the mixed liquid to 300°C under a nitrogen atmosphere. 2ml of trioctylphosphine solution dissolved with 0.2mmol of selenium powder and 3mmol of sulfur powder was injected into the mixed liquid in the flask. After reacting at 300°C for 10 minutes, 0.5ml of 1-octylthiol was added, and the reaction was continued at 300°C for 2 hours. After cooling the system to room temperature, add acetone, centrifuge to obtain a precipitate, then use chloroform to di...
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