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Temperature-dependent self-trapped exciton emission in Cu(I) doped zinc-based metal halides from well-resolved excited state structures

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Nano Research 2024年第8期17卷 7768-7775页

作者： Yunlong Bai Shuai Zhang Nengneng Luo Bingsuo Zou Ruosheng Zeng State Key Laboratory of Featured metal Materials and Life-cycle Safety for Composite Structures School of Physical Science and TechnologyGuangxi UniversityNanning 530004China

Zero-dimensional metal halides are of unique structures and tunable photoluminescence properties,showing great potential applications such as light-emitting diodes(LEDs)and ***,we successfully synthesized Cu^(+)doped(MA)_(2)ZnCl_(4)metal halides by a slow evaporation solvent *** introduction of Cu^(+)results in sky-blue self-trapped exciton emission in(MA)_(2)ZnCl_(4) at 486 nm at room temperature,and a photoluminescence quantum yield is as high as 54.9%.Interestingly,at low temperatures,Cu^(+)-doped(MA)_(2)ZnCl_(4) exhibits two emission peaks located at 482 and 605 nm,*** temperaturedependent dual emission indicates two excited state structures that exist on the triplet excited-state potential energy *** addition,the temperature sensor we fitted has good performance(Sr=1.65%·K^(−1)),which is the first attempt in Cu^(+) doped Znbased metal *** work enriches the family of sky-blue metal halides and provides a promising strategy for building skyblue LEDs.

关键词： sky-blue emission self-trapped exciton metal halides excited state structures temperature sensor

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Optoelectronic and elastic properties of metal halides double perovskites Cs_(2)InBiX_(6)(X = F, Cl, Br, I)

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Chinese Optics Letters 2021年第3期19卷 17-26页

作者： Muhammad Saeed Izaz Ul Haq Shafiq Ur Rehman Akbar Ali Wajid Ali Shah Zahid Ali Qasim Khan Imad Khan State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China College of Nuclear Science and Engineering East China University of TechnologyNanchang 330013China Center for Computational Materials Science Department of PhysicsUniversity of MalakandChakdaraPakistan College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China College of Electronic Science and Technology Shenzhen UniversityShenzhen 518000China

Structural geometry, electronic band gaps, density of states, optical and mechanical properties of double perovskite halides Cs2InBiX6(X = F, Cl, Br, I) are investigated using the density functional theory. These compounds possess genuine perovskite stoichiometry, evaluated using various geometry-based indices like tolerance factor, octahedral factor, and formation energy. The fundamental electronic band gaps are direct and valued in the range 0.80–2.79 e V. These compounds have narrow band gaps(except Cs2InBiX6) due to strong orbital coupling of the cations. The valence band maximum and conduction band minimum are confirmed to be essentially of In 5 s and Bi 6 p characters, respectively. The splitting of Bi 6 p bands due to strong spin-orbit coupling causes reduction in the band gaps. These compounds have large dispersion in their bands and very low carrier effective masses. The substitution of halogen atoms has great influence on the optical properties. The mechanical properties reveal that Cs2InBiX6(X = F, Cl, Br, I) satisfy the stability criteria in cubic structures.

关键词： optical materials metal halides density functional theory perovskite stoichiometry spin-orbit coupling

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Dimensionality engineering of metal halide perovskites

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Frontiers of Optoelectronics 2020年第3期13卷 196-224页

作者： Rashad FKAHWAGI Sean TTHORNTON Ben SMITH Ghada LKOLEILAT Department of Chemical Engincering Dalhousic UniversityHalifaxNova ScotiaB3J IZ1Canada

metal halide perovskites are a class of materials that are ideal for photodetectors and solar cells due to their excellent optoelectronic *** low-cost and low temperature synthesis have made them attractive for extensive research aimed at revolutionizing the semiconductor *** rich chemistry of metal halide perovskites allows compositional engineering resulting in facile tuning of the desired optoelectronic ***,using different experimental synth-esis and deposition techniques such as solution processing,chemical vapor deposition and hot-injection methods,the dimensionality of the perovskites can be altered from 3D to 0D,each structure opening a new realm of applications due to their unique *** engineering includes both morphological engineering reducing the thickness of 3D perovskite into atomically thin films and molecular engineering--incorporating long-chain organic cations into the perovskite mixture and changing the composition at the molecular *** optoelectronic properties of the perovskite structure including its band gap,binding energy and carrier mobility depend on both its composition and *** plethora of different photodetectors and solar cells that have been made with different compositions and dimensions of perovskite will be reviewed *** will conclude our review by discussing the kinetics and dynamics of different dimen-sionalities,their inherent stability and toxicity issues,and how reaching similar performance to 3D in lower dimensionalities and their large-scale deployment can be achieved.

关键词： optoclectronics solar cells perovskite photo-detectors metal halides dimensionality

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Ionic Liquid Templated Synthesis of New Silver Iodides

Ionic Liquid Templated Synthesis of New Silver Iodides

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河南省化学会2020年学术年会

作者：宋丹娜廖水娇张仁春 Henan Province Key Laboratory of New Optoelectronic Functional Materials College of Chemistry and Chemical Engineering Anyang Normal University College of Basic Sciences Huazhong Agricultural University

metal halides have attracted increasing attention because of their diverse structures and fascinating properties,such as porosity,fluorescence,semi-conductivity,nonlinear optical,thermochromism,photochromism,and effective visible optical catalytic *** liquids consisting of pure ionic compositions,not only can afford ionic reaction medium,but also can provide designable template to aid the formation of new structures. In this work,a series of Ag-I compounds were synthesized via the solvothermal reaction of AgI and ionic *** research reveals that ionic liquids are critical for the ***,the structures are sensitive to the variation of the substitution group from C1 to C4. While,the structures are unsensitive to the variation of the substitution group from C4 to C6.

关键词： metal halides Ionic liquids Templates structural sensitivity

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