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Ultra-wide spectrum perovskite white light material as well as preparation and application thereof

A perovskite and white light technology, which is applied in luminescent materials, chemical instruments and methods, semiconductor/solid-state device manufacturing, etc., to achieve excellent wide-spectrum white light emission characteristics, low pollution, and simple synthesis process

Active Publication Date: 2021-02-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as we know, there are no related reports on this kind of ultra-wide continuous reading spectrum (FWHM ~ 350nm) perovskite white light LED materials

Method used

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  • Ultra-wide spectrum perovskite white light material as well as preparation and application thereof
  • Ultra-wide spectrum perovskite white light material as well as preparation and application thereof
  • Ultra-wide spectrum perovskite white light material as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Ultra Broad Spectrum (2-AA) 2 PB 4 The synthesis method of white LED material is as follows: 1) Dissolve 0.1g of 2-aminoanthracene (2-AA) in 150mL of ethanol, add 5mL of hydroiodic acid (HI) solution (55-58wt%), and remove by rotary evaporation at 60°C for 30min After most of the solvent, vacuum-dry at 60°C to obtain the hydroiodide (2-AAI) of 2-aminoanthracene; 2) combine 2-AAI with lead iodide (PbI 2 ) was dissolved in N,N-dimethylformamide (DMF) under heating and stirring at 150°C at a molar ratio of 2:1, and 2-AAI and PbI were controlled 2 The total concentration of the mixed solution is 0.88g / mL; 3) Spin-coat the DMF solution in step 2) on a glass slide preheated at 150°C at a spin-coating speed of 3000rpm, heat to 140°C in air and anneal to remove residual solvent , a layer of (2-AA) can be formed on the glass surface 2 PB 4 perovskite film.

[0033] figure 1 is ultra-broad spectrum (2-AA) 2 PB 4The UV-Vis absorption spectrum (black) and fluorescence emiss...

Embodiment 2

[0039] In order to check the quality of 2-AA to Ultra Broad Spectrum (2-AA) 2 PB 4 The influence of white LED materials, except the mass of 2-AA is 0.02, 0.05, 0.2 and 0.4g, other conditions are as follows: HI volume (5mL), 2-AAI and PbI 2 Molar ratio (2:1), 2-AAI and PbI 2 Heating temperature of mixed solution (140°C), 2-AAI and PbI 2 The total concentration of the DMF mixed solution (0.88g / mL), glass preheating temperature (140°C), spin coating speed (3000rpm), annealing temperature (100°C) and other conditions are all the same as in Example 1. The results show that when the 2-AA quality is 0.02 and 0.05g, because the concentration of 2-AA in ethanol is too low, although it can react completely, the production efficiency is too low, which is about 1 / 2 of that when the amount of 2-AA is 0.1g. 5 and 1 / 2, and cause waste of solvent. When the mass of 2-AA is 0.2 and 0.4g, it is difficult to completely dissolve the excess 2-AA, resulting in incomplete subsequent acid-base neu...

Embodiment 3

[0041] To examine the volume of HI versus ultrabroad spectrum (2-AA) 2 PB 4 The influence of white LED materials, except the volume of HI is 0.2, 1.0, 20 and 50mL, other conditions are as follows: 2-AA mass (0.1g), 2-AAI and PbI 2 Molar ratio (2:1), 2-AAI and PbI 2 Heating temperature of mixed solution (140°C), 2-AAI and PbI 2 The total concentration of the DMF mixed solution (0.88g / mL), glass preheating temperature (140°C), spin coating speed (3000rpm), annealing temperature (100°C) and other conditions are all the same as in Example 1. The results show that when the volume of HI is 0.2 and 1.0mL, the 2-AA reaction is not complete due to the insufficient amount of HI, resulting in a large amount of unreacted 2-AA remaining in the synthesized 2-AAI, and the purity of the product at this time is analyzed from the spectrum Much lower than the purity when HI dosage is 5mL. When the volume of HI is 20 and 50mL, the excess of HI leads to waste of raw materials, and a large amou...

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Abstract

The invention provides a synthesis method of an ultra-wide spectrum perovskite white light LED material, which comprises the following steps: 1) dissolving 2-aminoanthracene(2-AA) in ethanol, adding hydroiodic acid (HI), carrying out rotary evaporation, and carrying out vacuum drying to obtain hydroiodate (2-AAI) of 2-aminoanthracene; 2) dissolving 2-AAI and lead iodide (PbI2) into N,N-dimethylformamide (DMF) under the condition of heating and stirring; and (3) spin-coating a DMF solution obtained in the step (2) on a glass sheet, and heating and annealing in air to remove the residual solvent, so as to form a layer of (2-AA) 2PbI4 perovskite film on the surface of the glass sheet. According to the obtained (2-AA)2PbI4 white light perovskite material, under the excitation of 375nm ultraviolet light, under the combined action of free exciton radiation, 2-AAI molecular fluorescence and self-confinement exciton luminescence, 400-750nm ultra-wide continuous spectrum white light emission isrealized. The synthesis method is simple to operate, can be applied to the construction of white-light LEDs, and is expected to produce good environmental, social and economic benefits.

Description

technical field [0001] The invention relates to a preparation technology of an ultra-wide spectrum white light LED perovskite material. [0002] technical background [0003] Lead halide perovskite materials have shown great potential for development in the fields of solar cells, photocatalysis, lasers, and light-emitting diodes (LEDs) due to their excellent photoelectric properties. Previously, relevant researchers have successfully realized the wide-spectrum fluorescence emission of perovskite by using low-dimensional perovskite self-confined exciton radiation. When this kind of material absorbs the excitation light photons to generate excitons, due to the electrostatic force of the excitons themselves, the crystal lattice near the excitons will be distorted to generate temporary defects, which will bind the excitons. Such excitons are called self-exciton. confined excitons. Since the excitons will lose a certain amount of energy after being bound, the emission wavelength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/24C09K11/06H01L51/50H01L51/54
CPCC07F7/003C09K11/06C09K2211/188H10K85/30Y02B20/00
Inventor 金盛烨孙祺田文明
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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