One-dimensional organic lead halide perovskites with efficient bluish white-light emission.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 28051092.
- Also identified by DOI 10.1038/ncomms14051 and PMC identifier 5216108.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
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, C<sub>4</sub>N<sub>2</sub>H<sub>14</sub>PbBr<sub>4</sub>, in which the edge sharing octahedral lead bromide chains [PbBr<sub>4</sub> <sup>2-</sup>]<sub>∞</sub> are surrounded by the organic cations C<sub>4</sub>N<sub>2</sub>H<sub>14</sub> <sup>2+</sup> 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.