Manipulating efficient light emission in two-dimensional perovskite crystals by pressure-induced anisotropic deformation

Manipulating efficient light emission in two-dimensional perovskite crystals by pressure-induced anisotropic deformation
Title:
Manipulating efficient light emission in two-dimensional perovskite crystals by pressure-induced anisotropic deformation
Other Titles:
Science Advances
Publication Date:
26 July 2019
Citation:
Science Advances 26 Jul 2019: Vol. 5, no. 7, eaav9445 DOI: 10.1126/sciadv.aav9445
Abstract:
The hybrid nature and soft lattice of organolead halide perovskites render their structural changes and optical properties susceptible to external driving forces such as temperature and pressure, remarkably different from conventional semiconductors. Here, we investigate the pressure-induced optical response of a typical two-dimensional perovskite crystal, phenylethylamine lead iodide. At a moderate pressure within 3.5 GPa, its photoluminescence red-shifts continuously, exhibiting an ultrabroad energy tunability range up to 320 meV in the visible spectrum, with quantum yield remaining nearly constant. First-principles calculations suggest that an out-of-plane quasi-uniaxial compression occurs under a hydrostatic pressure, while the energy is absorbed by the reversible and elastic tilting of the benzene rings within the long-chain ligands. This anisotropic structural deformation effectively modulates the quantum confinement effect by 250 meV via barrier height lowering. The broad tunability within a relatively low pressure range will expand optoelectronic applications to a new paradigm with pressure as a tuning knob.
License type:
http://creativecommons.org/licenses/by-nc/4.0/
Funding Info:
Q.X. acknowledges the strong support from Singapore Ministry of Education via Tier 2 grant (MOE2015-T2-1-047) and Tier 1 grants (RG 113/16 and RG 194/17). S.S. acknowledges support from National Natural Science Foundation of China (nos. 11504267 and 11604243), the Natural Science Foundation of Tianjin (no. 16JCQNJC01600), and Tianjin Municipal Education Commission Scientific Research project (2018KJ151). C.K.G. thanks the National Supercomputing Center (NSCC), Singapore and A*STAR Computational Resource Center (ACRC), Singapore for computing resources. A.G.d.Á. acknowledges the financial support of the Presidential Postdoctoral Fellowship program of the Nanyang Technological University. 13-BM-C operation is supported by COMPRES through the Partnership for Extreme Crystallography (PX2) project, under NSF cooperative agreement EAR 11-57758.
Description:
ISSN:
2375-2548
Files uploaded:

File Size Format Action
eaav9445full.pdf 4.28 MB PDF Open