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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Lead-Free Double Perovskite Cs2 AgInCl6.

Ying Liu1, Angshuman Nag2, Liberato Manna3

  • 1The Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P. R. China.

Angewandte Chemie (International Ed. in English)
|October 21, 2020
PubMed
Summary

Lead-free double perovskites like Cs2AgInCl6 offer stable alternatives to lead-based materials. Research highlights their tunable photoluminescence, stemming from self-trapped excitons and doping, for advanced optical applications.

Keywords:
Cs2AgInCl6double perovskitesluminescencephotoluminescence

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Optoelectronics

Background:

  • Lead-free halide perovskites are gaining traction as safer, more stable alternatives to lead-based perovskites.
  • Double perovskites, specifically Cs2AgInCl6, exhibit unique optical properties like self-trapped exciton (STE) emission and dopant-induced photoluminescence.
  • These materials are actively researched for their potential in various optoelectronic devices.

Purpose of the Study:

  • To review recent advancements in Cs2AgInCl6 bulk crystals and nanocrystals.
  • To explore synthesis strategies, intrinsic optical properties, and tunable photoluminescence.
  • To discuss computational studies on stability, defects, and the origin of photoluminescence.

Main Methods:

  • Literature review of synthesis approaches for Cs2AgInCl6 crystals and nanocrystals.
  • Analysis of intrinsic optical properties and photoluminescence mechanisms.
  • Summary of computational studies on thermodynamic stability and defect roles.

Main Results:

  • Cs2AgInCl6 exhibits tunable photoluminescence through alloying and doping.
  • Self-trapped excitons (STEs) and dopant emissions are key to its optical properties.
  • Computational studies provide insights into stability and the origins of luminescence.

Conclusions:

  • Cs2AgInCl6 and its alloys represent a promising class of lead-free materials for optical applications.
  • Understanding STE emission and defect physics is crucial for optimizing their performance.
  • Continued research in synthesis and computational modeling will drive future developments.