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- Title
Structural Tunability and Diversity of Two‐Dimensional Lead Halide Benzenethiolate.
- Authors
Coffey, Aidan H.; Yoo, Pilsun; Kim, Dong Hee; Akriti; Zeller, Matthias; Avetian, Sona; Huang, Libai; Liao, Peilin; Dou, Letian
- Abstract
Two‐dimensional (2D) organic‐inorganic hybrid materials are currently of great interest for applications in electronics and optoelectronics. Here, the synthesis and optical properties of a new type of halide‐organothiolate‐mixed 2D hybrid material, Pb2X(S‐C6H5)3, are reported, in which X is a halide (I, Br, or Cl). Different from conventional lead‐based 2D layered materials, these compounds feature unusual five‐coordinated lead centers with a stereochemically active electron lone pair on the lead atoms and four‐coordinated iodine atoms. The Pb2X(S‐C6H5)3 materials feature an indirect bandgap, strongly emissive long‐lived self‐trap states, and an extremely large Stokes shift. Interestingly, the optical bandgap of the materials can be tuned through variation of the halides; however, the photoluminescence is less sensitive to the composition and is more likely dominated by lead‐sulfur lattice interactions or the lead lone‐pair electrons. Our results support that a halide–organothiolate mixed anion hybrid structure offers a unique platform for discovering new exciting 2D electronic materials.
- Subjects
LEAD halides; STOKES shift; OPTICAL materials; NONBONDING electron pairs; ELECTRON pairs; INTRAMOLECULAR proton transfer reactions; IODINE
- Publication
Chemistry - A European Journal, 2020, Vol 26, Issue 29, p6599
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201905790