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Nanometer composite material FAPbBr3/SiO2, preparation method and applications thereof

A nanocomposite material, fapbbr3 technology, applied in the field of lasers, can solve problems such as difficult control of shell thickness, instability of FAPbX3 quantum dots hindering the development of optoelectronic devices, etc.

Active Publication Date: 2019-12-06
SHENZHEN INST OF WIDE BANDGAP SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the instability of FAPbX3 QDs hinders the further development of optoelectronic devices based on FAPbX3 perovskite QDs
In the prior art, the method of encapsulating quantum dots with an inert encapsulant is generally used to isolate water and oxygen and achieve the purpose of improving stability, but it is difficult to control the thickness of the shell layer in the encapsulation
On the other hand, SiO 2 Due to its good chemical stability and strong scattering of light, it can usually be used as a good laser medium to achieve low threshold and ultra-stable emission of up-conversion lasers with wavelength tunability (Advanced Optical Materials, 2018, 6 (3):1700997.) However, the preparation of lasers usually has higher requirements on the resonator and the process conditions of the preparation

Method used

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  • Nanometer composite material FAPbBr3/SiO2, preparation method and applications thereof
  • Nanometer composite material FAPbBr3/SiO2, preparation method and applications thereof
  • Nanometer composite material FAPbBr3/SiO2, preparation method and applications thereof

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Embodiment 1

[0056] 1. Preparation and amination of silicon spheres: take 20 ml of absolute ethanol, 2 ml of deionized water, 0.4 ml of ammonia water, and 0.4 ml of tetraethyl orthosilicate (TEOS). After stirring for 1 hour, the purification operation was carried out at 2000 r / s for 2 minutes, followed by three times of purification and centrifugation with ethanol at the same rotation speed and duration and drying. Take 0.5 g of nanospheres, inject 10 ml of absolute ethanol, 0.6 ml of 3-aminopropyltriethoxysilane (APTES), stir continuously for 1 hour, and purify and dry in the same way to obtain aminated SiO 2 Nanospheres.

[0057] 2. Take 10mg of FABr and 30mg of PbBr 2 Dissolve in 1 ml of DMF and stir well. Pour 45 mg of aminated SiO into the solution 2 Silicon balls, stir well.

[0058] 3. Take 1ml of precursor solution, add 100ml of oleic acid and 30ml of oleylamine, and stir for 5 minutes. Take 100 µl of FAPbBr 3 / SiO 2 The nucleation solution was added dropwise to a stirred so...

Embodiment 2

[0060] 1. Preparation and amination of silicon spheres:

[0061] Take 20 ml of absolute ethanol, 10 ml of deionized water, 1.2 ml of ammonia water, and 1.2 ml of tetraethyl orthosilicate (TEOS). After stirring for 8 hours, the purification operation was carried out at a rotation speed of 8000 r / s for 5 minutes, followed by three times of purification and centrifugation operations with ethanol at the same rotation speed and duration and drying. Take 2 grams of nanospheres, inject 20ml of absolute ethanol, 4ml of 3-aminopropyltriethoxysilane (APTES), stir continuously for 8 hours, purify and dry in the same way to obtain aminated SiO 2 Nanospheres.

[0062] 2. Take 60mg of FABr and 180mg of PbBr 2 Dissolve in 4 ml of DMF and stir well. Pour 220 mg of aminated SiO into the solution 2 Silicon balls, stir well.

[0063] 3. Take 1ml of precursor solution, add 300ml of oleic acid and 50ml of oleylamine, and stir for 5 minutes. Take 100 µl of FAPbBr 3 / SiO 2 The nucleation sol...

Embodiment 3

[0065] 1. Preparation and amination of silicon spheres:

[0066] Take 14.8 ml of absolute ethanol, 2 ml of deionized water, 0.63 ml of ammonia water, and 1.2 ml of tetraethyl orthosilicate (TEOS). After stirring for 8 hours, the purification operation was carried out at a rotation speed of 8000 r / s for 2 minutes, followed by three times of purification and centrifugation operations with ethanol at the same rotation speed and duration and drying. Take 0.6 g of nanospheres, inject 10 ml of absolute ethanol, 1 ml of 3-aminopropyltriethoxysilane (APTES), stir continuously for 8 hours, and purify and dry in the same way to obtain aminated SiO 2 Nanospheres.

[0067] 2. Take 22.4mg of FABr and 73.4mg of PbBr 2 Dissolve in 2 ml of DMF and stir well. Pour 100 mg of aminated SiO into the solution 2 Silicon balls, stir well.

[0068] 3. Take 2ml of precursor solution, add 400ml of oleic acid and 80ml of oleylamine, and stir for 5 minutes. Take 100 µl of FAPbBr 3 / SiO 2 The nucle...

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Abstract

The invention belongs to the technical field of laser, and relates to a nanometer composite material FAPbBr3 / SiO2 and a preparation method thereof, and applications in two-photon pumping nanometer random laser devices. The preparation method comprises: taking absolute alcohol, deionized water, ammonia water and tetraethyl orthosilicate (TEOS), mixing and stirring, purifying, and drying to obtain SiO2 nanospheres; injecting absolute alcohol and 3-aminopropyltriethoxysilane (APTES) into the SiO2 nanospheres, purifying, and drying to obtain aminated SiO2 nanospheres; dissolving FABr and PbBr2 into DMF, fully stirring, and pouring the aminated SiO2 nanospheres into the prepared solution to prepare a quantum dot solution A; adding oleic acid and oleylamine into the quantum dot solution A, and stirring to obtain a solution B; taking a small amount of the solution B, and adding into a trichloromethane solution in a dropwise manner; and carrying out centrifugal purification on the precipitatedproduct to obtain the nanometer composite material FAPbBr3 / SiO2.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a composite nanomaterial FAPbBr 3 / SiO 2 Applications in the field of nano-random lasers. Background technique [0002] Nanolasers have received more and more attention in the field of nanomaterials in recent years, and are widely used in super-resolution biomedical imaging, ultra-high-density data storage, and integrated optical chips. Since two-photon pump lasers do not require phase matching, they play an important role in 3D material fabrication and biological fields. [0003] Nanocrystalline quantum dots (QDs) due to size effects, quantum confinement effects, macroscopic quantum tunneling effects, and surface effects have derived low-dimensional physical properties with significant advantages, such as narrow emission peaks and facile synthesis methods, in low-threshold laser applications. Has enormous potential. [0004] The halide perovskite quantum dots that have emerge...

Claims

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Application Information

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IPC IPC(8): C01B33/14B82Y40/00B82Y30/00C07C257/12H01S3/16
CPCB82Y30/00B82Y40/00C01B33/14C01P2002/72C01P2002/80C01P2002/84C01P2004/03C07C257/12H01S3/1645
Inventor 唐孝生卞瑶杜鹃张孟叶怀宇张国旗
Owner SHENZHEN INST OF WIDE BANDGAP SEMICON
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