Formation and near-infrared emission of CsPbI3 nanoparticles embedded in Cs4PbI6 crystals

Zhen Bao, Chiao-Yin Hsiu, Mu-Huai Fang, Natalia Majewska, Weihao Sun, Shing-Jong Huang, Eric Chung-Yueh Yuan, Yu-Chun Chang, Jerry Chun Chung Chan, Sebastian Mahlik, Wuzong Zhou, Chia-Wei Yang, Kuang-Mao Lu, Ru-Shi Liu

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Abstract

Cs4PbI6, as a rarely investigated member of the Cs4PbI6(X is a halogen element) family, has been successfully synthesized at low temperatures, and the synthetic conditions have been optimized. Metal iodides such as LiI, KI, NiI2, CoI2, and ZnI2, as additives, play an important role in enhancing the formation of the Cs4PbImicrocrystals. ZnI2 with the lowest dissociation energy is the most efficient additive to supply iodide ions, and its amount of addition has also been optimized. Strong red to near-infrared (NIR) emission properties have been detected, and its optical emission centers have been identified to be numerous embedded perovskite-type α-CsPbI3 nanocrystallites (∼5 nm in diameter) based on investigations of temperature- and pressure-dependent photoluminescent properties. High-resolution transmission electron microscopy was used to detect these hidden nanoparticles, although the material was highly beam-sensitive and confirmed a “raisin bread”-like structure of the Cs4PbIcrystals. A NIR mini-LED for the biological application has been successfully fabricated using as-synthesized Cs4PbIcrystals. This work provides information for the future development of infrared fluorescent nanoscale perovskite materials.
Original languageEnglish
Pages (from-to)34742-34751
JournalACS Applied Materials & Interfaces
Volume13
Issue number29
Early online date15 Jul 2021
DOIs
Publication statusE-pub ahead of print - 15 Jul 2021

Keywords

  • Cs4PbI6
  • Perovskite
  • Crystals
  • Near-infrared
  • CsPbI3
  • Electron microscopy
  • Embedded nanoparticles

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