Cesium iodide nanocrystal and its preparation method and application
A nanocrystal and cesium iodide technology, applied in the field of quantum dots, can solve the problems of poor particle uniformity, too fragility, poor luminescence performance, etc., and achieve controllable nanocrystal morphology, good optical conversion ability and efficiency, and simple process. Effect
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[0021] The example of the present invention provides a method for preparing cesium iodide nanocrystals. The preparation method at least comprises the following steps:
[0022] React the cesium source precursor solution with the iodine source precursor solution at 165-195°C for 5-12 minutes, and immediately quench the reaction to obtain cesium iodide nanocrystals;
[0023] Neither the cesium source precursor solution nor the iodine source precursor solution dissolves oxygen molecules or water molecules.
[0024] The technical scheme of the preparation method of the present invention will be further explained in detail below.
[0025] The above-mentioned cesium source precursor solution is a cesium source precursor solution of octadecene and oleic acid, that is, the solvent is a mixture of octadecene and oleic acid, and the solute is a substance containing cesium.
[0026] Preferably, in the cesium source precursor solution, the volume ratio of the mixture of octadecene and ol...
Embodiment 1
[0039] A preparation method for spherical cesium iodide nanocrystals, comprising the following steps:
[0040] (1). Solvent removal treatment: put 50mL octadecene in a single-necked round-bottomed flask, seal it with a rubber stopper, and then put it in an oil bath at 140°C. Insert a syringe needle into the rubber stopper. The double rows of tubes are connected, and the vacuum treatment is carried out under the condition of 140°C oil bath for 30 minutes. After the pumping, argon gas is introduced, and a protective balloon filled with argon gas is inserted on the rubber plug to prevent air, water or other impurities from entering. Oleic acid and oleylamine are treated in the same way for later use.
[0041] (2). Preparation of cesium source precursor solution: put 0.015g of cesium carbonate into a three-neck round bottom flask with side openings closed, and then connect it to the condenser tube, which is connected to the double-row tube, and the interface is all Lubricate with...
Embodiment 2
[0046] A preparation method for hexagonal plate cesium iodide nanocrystals, comprising the following steps:
[0047] (1). Solvent removal treatment: put 50mL octadecene in a single-necked round-bottomed flask, seal it with a rubber stopper, and then put it in an oil bath at 140°C. Insert a syringe needle into the rubber stopper. The double rows of tubes are connected, and the vacuum treatment is carried out under the condition of 140°C oil bath for 30 minutes. After the pumping, argon gas is introduced, and a protective balloon filled with argon gas is inserted on the rubber plug to prevent air, water or other impurities from entering. Oleic acid and oleylamine are treated in the same way for later use.
[0048] (2). Preparation of cesium source precursor solution: put 0.015g of cesium carbonate into a three-neck round bottom flask with side openings closed, and then connect it to the condenser tube, which is connected to the double-row tube, and the interface is all Lubricat...
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