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Tunable blue emitting lead halide perovskites

A perovskite and compound technology, applied in the direction of lead organic compounds, luminescent materials, alkali metal compounds, etc., can solve the problems of lead halide perovskite instability, inability to provide semiconductor materials, and drop in emission efficiency

Pending Publication Date: 2021-04-27
OXFORD UNIV INNOVATION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thus, although mixing halide ions does shift the bandgap towards the blue region of the visible spectrum, the drop in emission efficiency is too low to provide a useful semiconductor material
[0012] Furthermore, lead halide perovskites may be unstable (A. Loiudice, S. Saris, E. Oveisi, D.T.L. Alexander, R. Buonsanti, Angew. Chem. Int. Ed. 2017, 56, 10696, Bryant et al ., Energy Environ. Sci., 2016, 9, 1655-1660)

Method used

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  • Tunable blue emitting lead halide perovskites
  • Tunable blue emitting lead halide perovskites
  • Tunable blue emitting lead halide perovskites

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Embodiment

[0439] 1. Materials

[0440] CsBr(99.9%), CsCl(99.9%), RbBr(99.9%), RbCl(99.9%), PbBr 2 (≥98%), PbCl 2

[0441] (≥98%), PbI 2 (≥98%), HBr acid (48wt%, in water), N,N-dimethylformamide (DMF), anhydrous dimethyl sulfoxide (DMSO), chlorobenzene (anhydrous 99.8%), toluene ( Anhydrous 99.8%) and methyl acetate (anhydrous 99.5%) were purchased from Sigma-Ardrich. CsI ​​(99.9%) was purchased from Alfa-Aesar. Ethylammonium bromide (EABr), butylammonium bromide (BABr) and phenethylammonium bromide (PEABr) were synthesized by the following method.

[0442] Under the condition of an ice-water bath, mix and stir 1.3M amine and 30 mL ethanol (anhydrous 99.5%) in a 250 mL three-necked flask. Then, 10 mL of HBr aqueous solution was slowly added to the mixture. The mixture was stirred for 30 minutes to 60 minutes at 0°C maintained with an ice-water bath. The reaction solution was evaporated by a rotary evaporator at 55°C to 60°C to remove the solvent, and a white precipitate formed. ...

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Abstract

The invention relates to perovskite compounds which have surprisingly good emission properties, particularly photoluminescent emission properties, in the blue region of the visible spectrum. These perovskites contain a mixture of cations or a mixture of halides, or both. The invention also relates to a photoactive material containing the perovskite species of the invention; to an optoelectronic device containing the photoactive material of the invention; to a method of producing blue light; and to the use of the photoactive material of the invention to emit blue light or as a phosphor.

Description

[0001] The project for which this application was made has been awarded to Marie - Funding from the European Union's Horizon2020 Research and Innovation Framework Program with Curie Grant No. 706552. technical field [0002] The present invention provides formula [Rb x Cs (1-x) ][Pb][Br y Cl (1-y) ] 3 A perovskite where x and y are each greater than 0 and less than 1. The present invention also provides formula {[A] 2 [M][X] 4} a {[Rb b Cs (1-b) ][Pb][Br c Cl (1-c) ] 3} 1-a A mixed perovskite of which a is greater than 0 and less than 1, b and c are between 0 and 1, and at least one of b and c is greater than 0 and less than 1. The present invention further provides formula [A] comprising (a) 2 [M][X] 4 The compound and (b) formula [Rb b Cs (1-b) ][Pb][Br c Cl (1-c) ] 3 mixture of compounds. Photoactive materials and optoelectronic devices comprising the perovskites, hybrid perovskites and mixtures of the present invention are also provided. Also provid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/46C07F7/24
CPCC01P2002/34C07F7/003Y02E10/549H10K85/30H10K85/50C09K11/665C07F7/24C07B2200/13B82Y20/00H10K50/135H10K50/11C01D17/00C01P2006/60
Inventor 酒井信世伯纳德·威戈亨利·詹姆斯·施耐德
Owner OXFORD UNIV INNOVATION LTD