High-efficiency light-emitting nanocrystal, preparation method thereof and LED light-emitting device

A nanocrystalline and high-efficiency technology is applied in the field of perovskite light-emitting device preparation, which can solve the problems of low efficiency of blue light devices, and achieve the effect of simple preparation process and improved device performance.

Pending Publication Date: 2020-08-14
UNIV OF SCI & TECH OF CHINA
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the long-chain characteristics of DDAB and the partial replacement of oleyl ammonium oleate, the efficiency of the prepared blue light device is still low (EQE=1.9%, the brightness is only 35cd / m 2 )

Method used

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  • High-efficiency light-emitting nanocrystal, preparation method thereof and LED light-emitting device
  • High-efficiency light-emitting nanocrystal, preparation method thereof and LED light-emitting device
  • High-efficiency light-emitting nanocrystal, preparation method thereof and LED light-emitting device

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preparation example Construction

[0035] The invention provides a highly efficient luminescent CsPbCl 3-x Br x A method for preparing nanocrystals, comprising the steps of:

[0036] A) CsPbCl 3 The nanocrystal is mixed with a solution of tributylphosphine oxide-calcium chloride, and a sedimentation agent is added to obtain a sedimentation product;

[0037] B) Add the solution of the sedimentation product and tributylphosphine oxide-calcium bromide to a sedimentation agent to obtain the treated high-efficiency luminescent CsPbCl 3-x Br x Nano crystal, x=0.2~2.8.

[0038] The present invention is to CsPbCl 3 nanocrystals are treated, wherein, the CsPbCl 3 The preparation method of the nanocrystal is not particularly limited, and the preparation method known to those skilled in the art will suffice. The CsPbCl 3 Nanocrystals are monodisperse CsPbCl synthesized by thermal injection 3 Nanocrystalline.

[0039] Wherein, the specific preparation method is:

[0040] Under an inert atmosphere, dissolve lead ...

Embodiment 1

[0083] (1) Synthesis of CsPbCl 3 Nanocrystalline and post-processing

[0084] Put 0.1mmol of cesium acetate, 0.2mmol of lead acetate, 0.3mL of oleic acid, 1.0mL of oleyl ammonium and 5.0mL of octadecene into a 25mL three-necked bottle, seal the bottle mouth, stir and heat up to 120°C, Simultaneously evacuate for 30 minutes, then pass in an inert atmosphere of nitrogen or argon until all the added drugs are dissolved until transparent, then raise the temperature to 200°C, inject 100 μl of benzoyl chloride, react for 20 seconds, and quench the reaction with an ice-water bath. The mixture was added with 5.0 mL of methyl acetate, and after separation by centrifugation (VELOCITY 14 / 14R, Dynamica) at 10000 rpm for 5 min, the resulting precipitate was dispersed in 5.0 mL of toluene to obtain CsPbCl 3 Nanocrystalline Toluene Dispersion.

[0085] Take 100 μl of a toluene solution of tributylphosphine oxide and calcium chloride (the concentration of tributylphosphine oxide is 1M; calc...

Embodiment 2

[0100] (1) Synthesis of CsPbBr 3 Nanocrystalline and post-processing

[0101] Put 0.1mmol of cesium acetate, 0.2mmol of lead acetate, 0.3mL of oleic acid, 1.0mL of oleyl ammonium and 5.0mL of octadecene into a 25mL three-necked bottle, seal the bottle mouth, stir and heat up to 120°C, Simultaneously evacuate for 30 minutes, then pass in an inert atmosphere of nitrogen or argon until all the added drugs are dissolved until transparent, then heat up to 170°C, inject 90 μl of benzoyl bromide, and quench the reaction with an ice-water bath after reacting for 5 seconds. The reaction mixture was added with 5.0 mL of methyl acetate, and after separation by centrifugation (VELOCITY14 / 14R, Dynamica) at 10000 rpm for 5 min, the resulting precipitate was dispersed in 5.0 mL of toluene to obtain CsPbBr 3 Nanocrystalline Toluene Dispersion.

[0102] Take 50 μl of a toluene solution of tributylphosphine oxide and calcium bromide (the concentration of tributylphosphine oxide is 1M; calcium...

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Abstract

The invention provides an efficient light-emitting CsPbCl3-xBrx nanocrystal preparation method which comprises the following steps of: A) mixing CsPbCl3 nanocrystals with a tributylphosphine oxide-calcium chloride solution, and adding a settling agent to obtain a settling product; and B) adding a settling agent into the settling product and a tributylphosphine oxide-calcium bromide solution to obtain the treated high-efficiency light-emitting CsPbCl3-xBrx nanocrystal (wherein x is equal to 0.2 to 2.8). The inorganic perovskite nanocrystal with high luminous efficiency is prepared through aftertreatment of the tributylphosphine oxide-calcium short-chain composite ligand, the performance of a pure blue light LED device can be remarkably improved through the nanocrystal, and the method has the advantages of simple preparation process, high efficiency, low cost and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of perovskite light-emitting devices, and in particular relates to a high-efficiency light-emitting nanocrystal, a preparation method thereof, and an LED light-emitting device. Background technique [0002] Metal halide perovskites have attracted much attention due to their excellent optical properties, such as high color purity, easy spectral tuning, and high luminous efficiency. In recent years, the efficiency of perovskite LED devices has been significantly improved by passivating defects and optimizing device structures. Among them, the external quantum efficiency (EQE) of green, red and near-infrared LED devices has been improved More than 20%. However, the efficiency of pure blue perovskite LED devices is still very low, which seriously hinders the further development of metal halide perovskite for light-emitting devices. Inorganic perovskite CsPbCl 3-x Br x Nanocrystals have been wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66C09K11/02H01L51/54B82Y30/00
CPCC09K11/665C09K11/025B82Y30/00H10K50/115
Inventor 姚宏斌姚纪松
Owner UNIV OF SCI & TECH OF CHINA
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