Regulation of structures and optical properties inlow-dimensional metal halides: Chemical synthesisand physical high-pressure 低维金属卤化物的结构与光学调控: 化学合成与物理高压

Shen，Pengfei; Li，Qian; Luo，Zhishan; Tan，Li; Wei，Yi; Quan，Zewei

2021-09-01

10.1360/TB-2020-1685

Chinese Science Bulletin-Chinese   影响因子和分区

0023-074X

2095-9419

Metal halides possess promising application prospects in the field of light-emitting diodes (LEDs), solar cells, photoelectric detectors, lasers and so on. Metal halides offer a versatile platform to adjust optical properties, due to their abundant chemical compositions, crystal structures and different dimensionalities. Notably, these metal halides possess three-dimensional (3D), two-dimensional (2D), one-dimensional (1D) and zero-dimensional (0D) structures at the molecular level. 3D metal halides (ABX: A stands for Cs and CHNH, etc.; B stands for Pb and Sn; X stands for Cl, Br and I) consist of a framework of corner-sharing [BX] octahedra that extend in three dimensions, with small inorganic/organic cations filling into the spaces between the octahedra. Due to the outstanding carrier transport property and low exciton binding energy, 3D metal halides have emerged as one of the most promising materials for next-generation solar cells. 2D metal halides can be considered as layered structure that are ripped in a specific crystallographic direction from 3D metal halides. In 1D metal halides, the polyhedrons are connected by corner, edge or face-sharing, and the inorganic chains are surrounded by organic cations. 0D metal halides are composed of isolated polyhedrons or cluster and the individual structural units are completely surrounded by large organic cations. Low-dimensional analogs usually show more structural distortion, stronger quantum confinement effects, significantly improved exciton binding energy and better stability compared with 3D metal halides. These properties make them efficient luminescent materials in the field of lighting and display. The structure and optical properties of low-dimensional metal halides can be adjusted by traditional chemical methods as well as high pressure. Recently, traditional chemical methods (such as element doping and halogen substitution) have been used to induce diverse photoluminescence (PL) properties. Pressure, as a fundamental thermodynamic variable, can control the properties of materials through decreasing interatomic distances and tuning electronic orbitals and bonding patterns. Different from chemical methods, high-pressure technique can be used to continuously modulate the structure and properties of materials without changing the chemical composition. Especially, the soft lattice of metal halides are sensitive to pressure and possess effective tunability under mild pressure. Some prominent properties, such as pressure-induced emission/PL enhancement, are observed in metal halides. This paper firstly introduces the structures and optical properties of metal halides by traditional chemical methods. Then, the applications of high-pressure technology in the regulation of structure and optical properties in metal halides are discussed. The intrinsic relationship between the structures and optical properties is reviewed. This paper provides important ideas for the rational design and accurate synthesis of low-dimensional luminescent metal halides.

High pressure Low dimensional metal halides Optical properties Structure control

EI

中文

第一 ; 通讯

20213910941979

Binding energy ; Chemical bonds ; Crystal structure ; Excitons ; High pressure engineering ; Metal halides ; Metals ; Perovskite ; Positive ions ; Structural properties

Structural Design:408 ; Minerals:482.2 ; Light/Optics:741.1 ; Physical Chemistry:801.4 ; Chemical Products Generally:804 ; Crystal Lattice:933.1.1 ; Materials Science:951

2-s2.0-85115443986

Scopus

Shenzhen Engineering Research Center for Frontier Materials Synthesis at High Pressures,Academy for Advanced Interdisciplinary Studies,Department of Chemistry,Southern University of Science and Technology,Shenzhen,518055,China

Shen，Pengfei,Li，Qian,Luo，Zhishan,等. Regulation of structures and optical properties inlow-dimensional metal halides: Chemical synthesisand physical high-pressure 低维金属卤化物的结构与光学调控: 化学合成与物理高压[J]. Chinese Science Bulletin-Chinese,2021,66(25):3261-3271.

Shen，Pengfei,Li，Qian,Luo，Zhishan,Tan，Li,Wei，Yi,&Quan，Zewei.(2021).Regulation of structures and optical properties inlow-dimensional metal halides: Chemical synthesisand physical high-pressure 低维金属卤化物的结构与光学调控: 化学合成与物理高压.Chinese Science Bulletin-Chinese,66(25),3261-3271.

Shen，Pengfei,et al."Regulation of structures and optical properties inlow-dimensional metal halides: Chemical synthesisand physical high-pressure 低维金属卤化物的结构与光学调控: 化学合成与物理高压".Chinese Science Bulletin-Chinese 66.25(2021):3261-3271.