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Low-dimensional inorganic-organic hybrid metal halide perovskites

A perovskite and halogen technology, applied in tin organic compounds, organic chemistry, tin halide, etc., can solve the problems of material and substrate limitations, inability to achieve uniform coating with luminous quality, harsh synthesis conditions, etc.

Active Publication Date: 2020-03-06
NANYANG TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the harsh synthesis conditions (high temperature and high pressure) of the above-mentioned phosphorescent materials, there are restrictions on applicable materials and substrates
In addition, oxide-based phosphorescent materials generally cannot be processed in solution to produce uniform thin coatings, so uniform coatings that can improve the quality of light emission cannot be achieved

Method used

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  • Low-dimensional inorganic-organic hybrid metal halide perovskites
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  • Low-dimensional inorganic-organic hybrid metal halide perovskites

Examples

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preparation example Construction

[0260] As mentioned above, the conditions required for fabrication are convenient and can be performed at room temperature. In view of this, also provide a kind of preparation method of above-mentioned formula I zero-dimensional perovskite, comprise the steps:

[0261] (a) tin halide and / or pseudotin halide and formula II compound:

[0262]

[0263] mixed in a solvent, where, A, L, R 1 ~R 3 , X, n, m and p are as defined above for formula I, and y is equal to p; and

[0264] (b) adding an anti-solvent to the mixture to precipitate the zero-dimensional perovskite of formula I.

[0265] It can be understood that the perovskites of formula Ia, formula Ib, formula III and formula IV can be produced in a manner similar to the above method.

[0266] In this application, "solvent" means capable of maintaining a raw material in solution when provided in an appropriate amount (such as an economically feasible amount of solvent) readily determined by a person skilled in the art i...

Embodiment 1

[0297] Example 1: Single Crystal Growth and Structural Characterization of m-xylylenedimethylammonium tin (II) bromide (m-XDATB)

[0298] synthesis

[0299] Prepare m-xylylenedimethylammonium bromide (m-XDABr) as described above 2 ), and m-XDATB single crystals were grown by anti-solvent vapor-assisted crystallization. 1 equivalent of tin halide (SnX 2 ) and 2 equivalents of m-XDABr 2 Ammonium halide was dissolved in a minimum amount of N,N-dimethylformamide (DMF) to obtain a saturated solution. Subsequently, the vapor of dichloromethane (DCM) as an anti-solvent was diffused into the perovskite solution, resulting in the formation of m-XDATB single crystals (molecular formula (m-XDA) determined by X-ray diffraction) after several days 2 SnBr 6 ). The obtained crystals were washed with DCM and used for single crystal X-ray diffraction (XRD) measurements and ultrafast spectroscopy studies.

[0300] Single Crystal X-ray Diffraction (XRD) Characterization

[0301] m-XD...

Embodiment 2

[0312] Example 2: Oxidative stability and thermal stability of m-XDATB characterized by X-ray photoelectron spectroscopy (XPS), photoelectron spectroscopy in air (PESA), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) sex

[0313] Such as image 3 As shown in a, the oxidation stability of m-XDATB was investigated by performing full-spectrum scanning of X-ray photoelectron spectroscopy (XPS) in the binding energy range of 0 to 800 eV. As shown in the figure, since the core level peaks of Sn, Br, C, and N elements are observed, it can be confirmed that all these elements are contained in m-XDATB. snd 3 / 2 and d 5 / 2 Electron binding energy XPS narrow-spectrum scanning results prove that metal Sn( image 3 b). However, due to Sn 4+ and Sn 2+ 3d 5 / 2 The binding energies are relatively close, so the oxidation state of Sn cannot be determined clearly. The molecular formula of m-XDATB determined by single crystal X-ray crystallography is (m-XDA) 2 Sn...

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Abstract

Disclosed herein is a zero-dimensional hybrid organic-inorganic perovskite material of Formula (I) wherein A contains at least one aromatic or heteroaromatic ring, M is selected from Ge, Pb, Sn, Mn, Cu, Co, and Eu, and X is a halide or pseudohalide. Preferably, M is Sn, and the organic part is meta-xylenediammonium. Also disclosed herein is a method of preparing said materials and the use of saidmaterials for white light emitting devices.

Description

technical field [0001] The present invention relates to low-dimensional inorganic / organic hybrid metal halide perovskites and their use in white light applications. Background technique [0002] In this specification, the enumeration or discussion of prior published documents should not necessarily be regarded as an acknowledgment that such documents are part of the prior art, or are common general knowledge. [0003] Currently, a lighting technology called Solid State Lighting (SSL), in which solid state light emitting diodes (LEDs) emit light, is gaining great attention. Compared with other light sources, LEDs are generally compact in structure, and have longer service life and higher energy conversion efficiency (see, for example, Schubert, E.F. et al. Science 2005, 308, 1274; Shirasaki, Y. et al. Nat. Photonics 2013, 7, 13; Ponce, F.A. et al. Nature 1997, 386, 351). Since white light lighting is the most widely used, white light LED (WLED) is particularly important and...

Claims

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Application Information

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IPC IPC(8): C09K11/66C01G19/04C01G21/16C07C211/27H01L51/50C07F7/00C07F7/22C01G17/04
CPCC07C211/27H05B33/14Y02B20/00C09K11/06C09K2211/188C09K11/664H10K50/115H10K50/125H10K85/50
Inventor 蒂鲁马尔·克里斯那莫斯苏博德·高塔姆·马沙尔卡尼潘·马修斯苏汉昇
Owner NANYANG TECH UNIV
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