Inside Perovskites: Quantum Luminescence from Bulk Cs4PbBr6 Single Crystals

Michele de Bastiani, Ibrahim Dursun, Yuhai Zhang, Buthainah Alshankiti, Xiaohe Miao, Jun Yin, Emre Yengel, Erkki Alarousu, Bekir Turedi, Jawaher Almutlaq, Makhsud I. Saidaminov, Somak Mitra, Issam Gereige, Ahmed Alsaggaf, Yihan Zhu, Yu Han, Iman S. Roqan, Jean-Luc Bredas, Omar F. Mohammed, Osman Bakr

Research output: Contribution to journalArticlepeer-review

139 Scopus citations

Abstract

Zero-dimensional perovskite-related structures (0D-PRS) are a new frontier of perovskite-based materials. 0D-PRS, commonly synthesized in powder form, manifest distinctive optical properties such as strong photoluminescence (PL), narrow emission linewidth, and high exciton binding energy. These properties make 0D-PRS compelling for several types of optoelectronic applications, including phosphor screens and electroluminescent devices. However, it would not be possible to rationally design the chemistry and structure of these materials, without revealing the origins of their optical behaviour, which is contradictory to the well-studied APbX3 perovskites. In this work, we synthesize single crystals of Cs4PbBr6 0D-PRS, and investigated the origins of their unique optical and electronic properties. The crystals exhibit a PL quantum yield higher than 40%, the highest reported for perovskite-based single crystals. Time-resolved and temperature dependent PL studies, supported by DFT calculations, and structural analysis, elucidate an emissive behaviour reminiscent of a quantum confined structure rather than a typical bulk perovskite material.
Original languageEnglish (US)
Pages (from-to)7108-7113
Number of pages6
JournalChemistry of Materials
Volume29
Issue number17
DOIs
StatePublished - Aug 22 2017

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