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A manganese doped cspbbr 3 Perovskite quantum dot and molecular sieve composite luminescent material and its preparation method and application

A technology of luminescent materials and molecular sieves, applied in luminescent materials, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve problems such as harmfulness to human body and environment, limit further application, toxicity, etc., and achieve good application prospects , good environmental stability, and the effect of reducing the proportion of dosage

Active Publication Date: 2020-09-22
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, pure quantum dot materials are sensitive to environmental factors such as temperature and humidity, and the attenuation of luminescence under external conditions limits their further applications in white light LEDs and other fields. There are also many studies on stable quantum dot composite materials
[0003] On the other hand, the lead element in perovskite quantum dots has certain toxicity as a heavy metal, which is harmful to the human body and the environment, hindering its wider production and application. Therefore, by doping other ions in perovskite quantum dots Replacing lead has also become the latest research direction. At present, most of the research is to dope divalent manganese ions into perovskite quantum dots. Doping modulation of luminescence has been reported, but there are few studies on the modulation of luminescence by the doping of divalent manganese in green light quantum dots

Method used

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  • A manganese doped cspbbr <sub>3</sub> Perovskite quantum dot and molecular sieve composite luminescent material and its preparation method and application
  • A manganese doped cspbbr <sub>3</sub> Perovskite quantum dot and molecular sieve composite luminescent material and its preparation method and application
  • A manganese doped cspbbr <sub>3</sub> Perovskite quantum dot and molecular sieve composite luminescent material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A manganese-doped CsPbBr 3 The preparation method of the perovskite quantum dot and molecular sieve composite luminescent material specifically comprises the following steps:

[0038] (1) Accurately weigh 2.13g cesium bromide (CsBr), dissolve it in 10mL distilled water to obtain a 1mol / L cesium bromide solution; mix 1.0g Y-type molecular sieve (SiO 2 / Al 2 o 3 = 5.1, Alfa Aesar brand) into cesium bromide solution, stirred in a water bath at 60°C for 20h (stirring speed is 400r / min), centrifuged (centrifugal speed is 3500r / min) for 5min, the lower layer sample was taken, washed twice with distilled water, And after drying at 60°C for 12h, Cs was obtained + Exchanged Y-type molecular sieve;

[0039] (2) Add 5 mL of octadecene (ODE), 1 mL of oleic acid (OA), 1 mL of oleylamine (OAm), lead bromide (PbBr) 2 ) 0.012g (0.033mmol), manganese bromide (MnBr 2 ) 0.035g (0.167mmol) was mixed in a container, vacuumed at 120°C for 30min, N 2 Stir at 120°C under the atmosphere...

Embodiment 2

[0043] A manganese-doped CsPbBr 3 The preparation method of the perovskite quantum dot and molecular sieve composite luminescent material specifically comprises the following steps:

[0044] (1) Accurately weigh 0.213g cesium bromide (CsBr), dissolve it in 10mL distilled water to obtain a 0.1mol / L cesium bromide solution; mix 1.0g Y-type molecular sieve (SiO 2 / Al 2 o 3 = 5.1, Alfa Aesar brand) into cesium bromide solution, stirred in a water bath at 80°C for 20h (stirring speed is 400r / min), centrifuged (centrifugal speed is 3500r / min) for 5min, took the lower layer sample, washed twice with distilled water, And after drying at 80°C for 12h, Cs was obtained + Exchanged Y-type molecular sieve;

[0045] (2) Add 5 mL of octadecene (ODE), 1 mL of oleic acid (OA), 1 mL of oleylamine (OAm), lead bromide (PbBr) 2 ) 0.018g (0.05mmol), manganese bromide (MnBr 2 ) 0.032g (0.15mmol) mixed in a container, vacuumed at 100°C for 30min, N 2 Stir at 120°C under the atmosphere (stirri...

Embodiment 3

[0049] A manganese-doped CsPbBr 3 The preparation method of the perovskite quantum dot and molecular sieve composite luminescent material specifically comprises the following steps:

[0050] (1) Accurately weigh 1.065g cesium bromide (CsBr), dissolve it in 10mL distilled water to obtain a 0.5mol / L cesium bromide solution; mix 1.0g Y-type molecular sieve (SiO 2 / Al 2 o 3 = 5.1, Alfa Aesar brand) into the cesium bromide solution, stirred in a water bath at 25°C for 36h (the stirring speed was 400r / min), centrifuged (the centrifugation speed was 3500r / min) for 5min, the lower layer sample was taken, washed twice with distilled water, And after drying at 120°C for 5h, Cs was obtained + Exchanged Y-type molecular sieve;

[0051] (2) Add 5 mL of octadecene (ODE), 1 mL of oleic acid (OA), 1 mL of oleylamine (OAm), lead bromide (PbBr) 2 ) 0.037g (0.1mmol), manganese bromide (MnBr 2 ) 0.022g (0.1mmol) mixed in the container, vacuumed at 120°C for 30min, N 2 Stir at 150°C under ...

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Abstract

The invention discloses a manganese doped CsPbBr3 perovskite quantum dot and molecular sieve composite luminescent material as well as a preparation method and an application thereof, and belongs to the technical field of luminescent materials. The method comprises the following steps: (1) stirring, centrifugation, washing and drying are carried for molecular sieve and a cesium bromide solution in order to obtain Cs+ exchanged molecular sieve; (2) octadecene, oleic acid and oleylamine are used for lead bromide and manganous bromide in order to obtain a bromide solution; (3) under the condition of inert gas and stirring, in octadecene, the bromide solution and the Cs+ exchanged molecular sieve are reacted, and cooling, washing and drying are carried out in order obtain the manganese doped CsPbBr3 perovskite quantum dot and molecular sieve composite luminescent material. The composite luminescent material has multi-peak emission in blue light and green light zones, and luminescent peak positions and each luminescent peak intensity can be modulated according to proportion between manganese ions and lead ions; the composite luminescent material has good environmental stability, and can be applied to the field of white light LED.

Description

technical field [0001] The invention belongs to the field of luminescent materials, and in particular relates to a manganese-doped CsPbBr3 perovskite quantum dot and molecular sieve composite luminescent material and a preparation method and application thereof. Background technique [0002] In recent years' research, all-inorganic perovskite-type quantum dot materials (CsPbX 3 , X = Cl, Br, I) Due to the narrow emission peak width and high quantum yield, the stability in solution is good, and the luminescence can be adjusted in the entire visible light range by the two factors of halogen composition and particle size It has attracted widespread attention, and these advantages have made perovskite quantum dots a research focus in optoelectronic fields such as lighting and display. At the same time, pure quantum dot materials are sensitive to environmental factors such as temperature and humidity, and the attenuation of luminescence under external conditions limits their fu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/66B82Y20/00B82Y30/00B82Y40/00H01L33/26
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/666H01L33/26Y02B20/00
Inventor 叶柿孙佳奕张勤远
Owner SOUTH CHINA UNIV OF TECH
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