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An improved manganese-doped cspbcl 3 Manganese Doping Concentration and Luminescence Efficiency of Nanocrystals

A technology of luminous efficiency and manganese doping, applied in nano optics, luminescent materials, nanotechnology, etc., to achieve the effect of improving luminous efficiency

Active Publication Date: 2022-06-24
JILIN NORMAL UNIV
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Problems solved by technology

[0003] In existing studies, at a relatively low synthesis temperature of 190 °C, CsPbCl 3 Mn in nanocrystals 2+ The doping concentration is generally at the level of 1% to 7%, and to obtain the highest point of 7%, the molar ratio of Mn to Pb needs to be 5:1, as shown in the literature (Chem.Mater.2017, 29, 8003-8011 ), if you want in CsPbCl 3 Achieve up to 15% Mn in nanocrystals 2+ Doping concentration, the synthesis temperature needs to be increased to 210 or 230 °C, as documented (Chem. Increased CsPbCl at a lower synthesis temperature of 190°C 3 Mn in nanocrystals 2+ CsPbCl can be achieved under the condition of doping concentration or lower synthesis temperature 3 Up to 15% Mn in nanocrystals 2+ Doping concentration has become an urgent problem for researchers to solve
[0004] In addition, in existing studies, such as those reported by Samanta et al. (Nanoscale2017, 9, 16722-16727), Pradhan et al. (J. Phys. Chem. Lett. 2019, 10, 1530-1536) and our previous experimental results show that (Chem.Mater.2017,29,8003-8011), manganese doped CsPbCl 3 The luminous efficiency of nanocrystals in orange light (600nm) and red light (620nm) is about 60% and 10%

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  • An improved manganese-doped cspbcl <sub>3</sub> Manganese Doping Concentration and Luminescence Efficiency of Nanocrystals
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[0028] The present invention provides a method by introducing NiCl 2 Enhanced Mn-doped CsPbCl 3 The preparation method of nanocrystal doping and luminous efficiency, the method comprises:

[0029] Step 1: Mix cesium carbonate, oleic acid and oil phase solvent, and under the protection of inert gas, stir and heat until the solution is clear to obtain a cesium precursor solution, which is cooled to 100 ° C for use. The molar mass of the cesium carbonate is 0.68 mmol, and the oil phase solvent is preferably one or more of octadecene amine, octadecene, and oleyl amine, more preferably octadecene; The volume ratio is preferably 1:(6~10), more preferably 1:8; the inert gas is preferably nitrogen, helium, neon or argon, more preferably argon; the heating temperature is 130 ~170°C, more preferably 150°C for 5 minutes.

[0030] Step 2: mix octadecene, oleic acid, oleylamine, trioctylphosphine, lead chloride, manganese chloride and nickel chloride, then the mixed solution obtained is...

Embodiment 1

[0035] Step 1: 0.68mmol of cesium carbonate, 1.25mL of oleic acid, 10mL of octadecene were added to the three-necked flask of 50mL at room temperature, evacuated, and passed into an inert gas to remove gas, under the protection of argon, the The mixed solution was stirred and heated to 150°C, and kept at this temperature until the solution was clear and transparent to obtain a cesium precursor solution, which was cooled to 100°C for use; the number of times of vacuuming could be multiple times, specifically 2 times, 3 times, and 4 times. Wait;

[0036] Step 2: 5mL octadecene, 1.5mL oleic acid, 1.5mL oleylamine, 1mL trioctylphosphine, 0.2mmol lead chloride, 0.2mmol manganese chloride and 0.2mmol nickel chloride were added to the 50mL three-necked flask, Evacuate, pass in inert gas to remove gas, and under the protection of argon, heat the mixed solution to 190 ° C with stirring, and keep this temperature for 10 min to fully dissolve the nickel chloride; the number of vacuuming ...

Embodiment 2

[0040] Step 1: at room temperature, 0.68mmol of cesium carbonate, 1.25mL of oleic acid, 8mL of octadecenylamine were added to the three-necked flask of 50mL, evacuated, and passed into an inert gas to remove gas, under the protection of nitrogen, the The mixed solution was stirred and heated to 130°C, and kept at this temperature until the solution was clear and transparent to obtain a cesium precursor solution, which was cooled to 100°C for use; the number of times of vacuuming could be multiple times, specifically 2 times, 3 times, and 4 times. Wait;

[0041] Step 2: 5mL octadecene, 1.5mL oleic acid, 1.5mL oleylamine, 1mL trioctylphosphine, 0.2mmol lead chloride, 0.2mmol manganese chloride and 0.2mmol nickel chloride were added to the 50mL three-necked flask, Vacuum, pass in inert gas to remove gas, under the protection of nitrogen, stir and heat the mixed solution to 190 ° C, and maintain this temperature for 10 min to fully dissolve the nickel chloride; the number of vacuu...

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Abstract

The present invention belongs to doped CsPbCl 3 The technical field of nanocrystalline material preparation, specifically related to a method of improving manganese-doped CsPbCl 3 A method for manganese doping concentration and luminous efficiency of nanocrystals, the method comprising: preparing a cesium precursor solution; mixing octadecene, oleic acid, oleylamine, trioctylphosphine, lead chloride, manganese chloride and nickel chloride Mixing; forming Ni, Mn double-doped CsPbCl 3 Nanocrystalline; obtained Ni, Mn double-doped CsPbCl 3 Nanocrystalline solution. The method by adding NiCl 2 Improved Mn-doped CsPbCl 3 Crystallinity and surface defect states of nanocrystals to improve manganese-doped CsPbCl 3 Mn doping concentration and manganese doping CsPbCl in nanocrystals 3 Luminescence efficiency of nanocrystals.

Description

technical field [0001] The invention belongs to doping CsPbCl 3 The technical field of nanocrystalline material preparation, in particular to an improved manganese-doped CsPbCl 3 Methods for manganese doping concentration and luminous efficiency of nanocrystals. Background technique [0002] Mn 2+ Doping CsPbCl 3 Nanocrystals have broad orange-red luminescence, first reported in 2016 to convert Mn 2+ Doping into perovskites makes them potentially useful in next-generation white LEDs. It is well known that Mn 2+ :CsPbCl 3 Yellow-orange emission in nanocrystals from CsPbCl-based 3 excitons in the matrix to Mn 2+ Dopant energy transfer to Mn 2+ ion 4 T 1 → 6 A 1 d~d transition. Mn 2+ :CsPbCl 3 The yellow-orange light of nanocrystals comes from isolated Mn 2+ The orange emission of the ions (~590-600 nm), exhibits high photoluminescence yields up to about 60%. And some red Mn 2+ :CsPbCl 3 The luminescence of nanocrystals comes from Mn 2+ ~Mn 2+ For the red ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/66B82Y20/00B82Y30/00B82Y40/00
CPCC09K11/665B82Y20/00B82Y30/00B82Y40/00
Inventor 袁曦赵家龙邢柯李海波
Owner JILIN NORMAL UNIV
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