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Method for preparing manganese-doped perovskite quantum dots capable of emitting high-brightness white light

A perovskite, high-brightness technology, applied in the field of manganese-doped perovskite quantum dot materials and their preparation, achieves the effects of simple equipment, narrow band-edge luminescence peaks, and easy promotion

Active Publication Date: 2017-09-22
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current perovskite quantum dots that emit white light are mainly prepared by adjusting the composition of halogen anions to change the emission wavelength and then combine them. However, it has not been reported to adjust the fluorescence to form white light emission by changing the composition of cations.

Method used

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  • Method for preparing manganese-doped perovskite quantum dots capable of emitting high-brightness white light
  • Method for preparing manganese-doped perovskite quantum dots capable of emitting high-brightness white light
  • Method for preparing manganese-doped perovskite quantum dots capable of emitting high-brightness white light

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Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: Preparation of white light Mn:CsPb 2 (Br / Cl) 5 Quantum dots, comprising the steps of:

[0024] 1) Mix and stir 25mL methanol and 10mL hexylamine in an ice-water bath (0°C); add 10mL HBr dropwise; remove the ice-water bath and stir at room temperature for 2 hours; remove the solvent (rotary evaporation 70°C.); Recrystallize in a mixture of ether and ethanol, filter; collect, dry (vacuum, 60°C, 24 hours) to produce CH 3 (CH 2 ) 5 NH 3 Br; stored in glove box (H 2 O2 <0.1ppm)

[0025] 2) Add 0.5mmol PbBr 2 , 0.33mmol CH obtained in step 1 3 (CH 2 ) 5 NH 3 Br was mixed and dissolved in 10ml DMF, 2.5mmol MnCl 2 4H 2 O and 0.165mmol CsBr were dissolved in 5ml DMF and ultrasonically dissolved completely to make the required precursor solution;

[0026] 3) Add the precursor solution obtained in step 2 dropwise to the stirred 100ml toluene solution in sequence, and react for 1.5-2.5 hours to obtain the quantum dot material.

Embodiment 2

[0027] Embodiment 2: Preparation of white light Mn:CsPb 2 (Br / Cl) 5 Quantum dots, comprising the steps of:

[0028] 1) Mix and stir 25mL methanol and 10mL hexylamine in an ice-water bath (0°C); add 10mL HBr dropwise; remove the ice-water bath and stir at room temperature for 2 hours; remove the solvent (rotary evaporation 70°C.); Recrystallize in a mixture of ether and ethanol, filter; collect, dry (vacuum, 60°C, 24 hours) to produce CH 3 (CH 2 ) 5 NH 3 Br; stored in glove box (H 2 O2 <0.1ppm)

[0029] 2) 0.53mmol PbBr 2 , 0.32mmol CH obtained in Step 1 3 (CH 2 ) 5 NH 3 Br was mixed and dissolved in 6ml DMF, 2.5mmol MnCl 2 4H 2 O and 0.1mmol CsBr were dissolved in 3ml DMF and ultrasonically dissolved completely to make the required precursor solution;

[0030] 3) Add the precursor solution obtained in step 2 dropwise to the stirred 100ml toluene solution in sequence, and react for 1.5-2.5 hours to obtain the quantum dot material.

Embodiment 3

[0031] Embodiment 3: Preparation of white light Mn:CsPb 2 (Br / Cl) 5 Quantum dots, comprising the steps of:

[0032] 1) Mix and stir 25mL methanol and 10mL hexylamine in an ice-water bath (0°C); add 10mL HBr dropwise; remove the ice-water bath and stir at room temperature for 2 hours; remove the solvent (rotary evaporation 70°C.); Recrystallize in a mixture of ether and ethanol, filter; collect, dry (vacuum, 60°C, 24 hours) to produce CH 3 (CH 2 ) 5 NH 3 Br; stored in glove box (H 2 O2 <0.1ppm)

[0033] 2) Add 0.32mmol PbBr 2 , 0.23mmol CH obtained in step 1 3 (CH 2 ) 5 NH 3 Br was mixed and dissolved in 8ml DMF, 2.5mmol MnCl 2 4H 2 O and 0.12mmol CsBr were dissolved in 4ml DMF and ultrasonically dissolved completely to make the required precursor solution;

[0034] 3) Add the precursor solution obtained in step 2 dropwise to the stirred 100ml toluene solution in sequence, and react for 1.5-2.5 hours to obtain the quantum dot material.

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Abstract

The present invention discloses a method for preparing manganese-doped perovskite quantum dots capable of emitting high-brightness white light, wherein the manganese-doped perovskite quantum dots are Mn:CsPb2(Br / Cl)5. The preparation method comprises: (1) respectively dissolving PbBr2, CH3(CH2)5NH3Br, MnCl2.4H2O and CsBr in N,N-dimethylformamide (DMF) to prepare a reactant precursor solution; and (2) sequentially transferring the precursor solution into stirred toluene to form the quantum dot material, wherein the transferring method is adding at a rate of 20-60 drops / min in a dropwise manner. According to the present invention, the Mn doping can be controlled and induced without the complex thermodynamic process, the method has advantages of mild reaction condition, simple process and convenient operation, the precursor solution has good stability and can be used repeatedly a plurality of times, and the method is suitable for industrial promotion.

Description

technical field [0001] The invention relates to a manganese-doped perovskite quantum dot material emitting high-brightness white light and its preparation technology, belonging to the technical field of preparation and regulation of new materials. Background technique [0002] Inorganic perovskite quantum dots have the advantages of high quantum efficiency, narrow luminescence peak, and short fluorescence lifetime, as well as their unlimited potential as a new generation of photoelectric functional materials in the fields of lasers, LEDs, photodetection, and photoelectric conversion. It has become a hotspot in the field of quantum dot luminescent materials; and the composition and shape controllability of perovskite enables the adjustment of emission wavelength in the entire visible light region, which is very suitable for the preparation of high monochromatic WLEDs devices. The current perovskite quantum dots that emit white light are mainly prepared by adjusting the compos...

Claims

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Application Information

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IPC IPC(8): C09K11/66B82Y20/00B82Y30/00
CPCB82Y20/00B82Y30/00C09K11/665Y02B20/00
Inventor 王春雷吴浩徐淑宏崔一平
Owner SOUTHEAST UNIV
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