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Method for improving stability of perovskite quantum dot

A technology of quantum dots and stability, applied in chemical instruments and methods, lead compounds, inorganic chemistry, etc., can solve problems such as instability of perovskite quantum dots

Inactive Publication Date: 2017-05-24
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But CsPbI 3 Perovskite quantum dots are not as stable as CsPbI 3 Quantum dots deteriorate after two days in the air (J. Phys. Chem. Lett., 2016, 7, 495-503)

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  • Method for improving stability of perovskite quantum dot

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Embodiment 1

[0017] Weigh 0.2035g of cesium carbonate, add 10mL of octadecene, 1.25mL of oleic acid into a 100mL flask, blow nitrogen, heat to 120°C and dry for 1 hour, then raise the temperature to 150°C until the reaction is complete. Weigh 0.087g of lead iodide, add 5mL of octadecene, 0.5mL of oleic acid, and 0.5mL of oleylamine into a 100mL flask, blow nitrogen, heat to 120°C and dry for 1 hour, then add 0.06mL of tert-dodecanethiol, and heat up to 150 ℃, inject 0.4ml of preheated cesium oleate solution, and put into ice-water bath after 10s. The reaction stopped. The resulting product was centrifuged for 5 minutes, and the centrifuged precipitate was dissolved in cyclohexane solution to obtain CsPbI 3 Colloidal solution of perovskite quantum dots. The luminous intensity of this sample dropped to 80% of the initial intensity after 30 days.

Embodiment 2

[0019] Weigh 0.2035g of cesium carbonate, add 10mL of octadecene, 1.25mL of oleic acid into a 100mL flask, pass argon, heat to 120°C and dry for 3 hours, then raise the temperature to 130°C until the reaction is complete. Weigh 0.174g lead iodide, add 20mL octadecene, 5mL oleylamine into a 100mL flask, pass argon, heat to 120°C and dry for 4 hours, then add 0.5mL tert-dodecylmercaptan, heat up to 160°C, inject pre- Heated cesium oleate solution 0.4ml, put into ice-water bath after 60s. The reaction stopped. The obtained product is centrifuged, and the centrifuged precipitate is dissolved in n-hexane solution to obtain CsPbI 3 Colloidal solution of perovskite quantum dots.

Embodiment 3

[0021] Weigh 0.4324g of cesium acetate, add 30mL of octadecene, 4.5mL of oleic acid into a 100mL flask, blow nitrogen, heat to 120°C and dry for 1 hour, then raise the temperature to 150°C until the reaction is complete. Weigh 0.147g of lead iodide, add 50mL of octadecene, 2.5mL of oleic acid, and 0.5mL of trioctylphosphine into a 100mL flask, blow with argon, heat to 120°C and dry for 1 hour, then add 0.35mL of tertiary dodecyl mercaptan , the temperature was raised to 135°C, 1.2ml of preheated cesium oleate solution was injected, and ice-water bath was carried out after 30s. The reaction stopped. The obtained product is centrifuged, and the centrifuged precipitate is dissolved in a heptane solution to obtain CsPbI 3 Colloidal solution of perovskite quantum dots.

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Abstract

The invention provides a method for improving stability of a perovskite quantum dot and relates to preparation of a quantum dot. The method comprises the following steps: (1) putting caesium into mixed solution of octadecene and oleic acid, heating, and reacting, so as to obtain a Cs precursor solution; (2) under the protection of inert protective atmosphere, adding lead iodide solid into tert-dodecyl mercaptan, reheating and dissolving at least one of organic acid, organic ammonium and organic phosphate ligand in an octadecene solvent, then adding the Cs precursor solution obtained in the step (1), reacting, then putting a reaction vessel in ice-water bath, and stopping reaction, so that mixed solution is obtained; and (3) centrifuging the mixed solution obtained in the step (2), and dissolving the obtained precipitate in cyclohexane, thus obtaining CsPbI3 quantum dot solution. Stability of the quantum dot self is improved from aspects of self composition and modification of the quantum dot, raw materials are available, and a new synthesis step is not added.

Description

technical field [0001] The invention relates to the preparation of quantum dots, in particular to a method for improving the stability of perovskite quantum dots. Background technique [0002] Quantum dots are a kind of semiconductor with a particle size of nanometer. Due to its own quantum confinement effect and surface effect, it has many excellent optical properties, and has important applications in the fields of biomedicine, solar cells, lighting and display. Since the pure inorganic perovskite quantum dots were reported by Kovalenko et al. The advantages have attracted extensive attention of researchers and have been widely used in the fields of photoluminescence, electroluminescence devices and solar cells. Among them, the red luminescence of perovskite quantum dots mainly depends on CsPbI 3 components to achieve. But CsPbI 3 Perovskite quantum dots are not as stable as CsPbI 3 Quantum dots deteriorate after two days in the air (J. Phys. Chem. Lett., 2016, 7, 495...

Claims

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Application Information

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IPC IPC(8): C09K11/66C01G21/00B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C01G21/006C01P2004/64C09K11/665
Inventor 沈旭瑶夏添李烨解荣军
Owner XIAMEN UNIV
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