One-dimensional organic lead halide perovskites with efficient bluish white-light emission

By Zhao Yuan, Chenkun Zhou, Yu Tian, Yu Shu, J. Messier, Jamie C Wang, L. J. van de Burgt, K. Kountouriotis, Y. Xin, E. Holt and 4 more. Nature Communications, 2017

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Organic-inorganic hybrid metal halide perovskites, an emerging class of solution processable photoactive materials, welcome a new member with a one-dimensional structure. Herein we report the synthesis, crystal structure and photophysical properties of one-dimensional organic lead bromide perovskites, C4N2H14PbBr4, in which the edge sharing octahedral lead bromide chains [PbBr4 2−]∞ are surrounded by the organic cations C4N2H14 2+ to form the bulk assembly of core-shell quantum wires. This unique one-dimensional structure enables strong quantum confinement with the formation of self-trapped excited states that give efficient bluish white-light emissions with photoluminescence quantum efficiencies of approximately 20% for the bulk single crystals and 12% for the microscale crystals. This work verifies once again that one-dimensional systems are favourable for exciton self-trapping to produce highly efficient below-gap broadband luminescence, and opens up a new route towards superior light emitters based on bulk quantum materials. Low-dimensional systems exhibit unique optical properties. Yuanet al. demonstrate one-dimensional organic-inorganic hybrid metal halide perovskites with highly efficient bluish white-light emission due to efficient exciton self-trapping in the quantum-confined structure.

Subfields: Electrical and Electronic Engineering, Materials Chemistry

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