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Issue 7, 2018
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Self-assembled hierarchical nanostructured perovskites enable highly efficient LEDs via an energy cascade

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Abstract

Metal halide perovskites have established themselves as extraordinary optoelectronic materials, exhibiting promise for applications in large area illumination and displays. However, low luminescence, low efficiencies of the light-emitting diodes (LEDs), and complex preparation methods currently limit further progress towards applications. Here, we report on a new and unique mesoscopic film architecture featuring the self-assembly of 3D formamidinium lead bromide (FAPbBr3) nanocrystals of graded size, coupled with microplatelets of octylammonium lead bromide perovskites, which enables an energy cascade, yielding very high-performance light-emitting diodes with emission in the green spectral region. These hierarchically structured perovskite films exhibit photoluminescence quantum yields of over 80% and LEDs associated with record high efficiencies in excess of 57.6 cd A−1 with an external quantum efficiency above 13%. Additionally, due to low turn-on voltages (∼2.2 V) the LEDs have power efficiencies exceeding 58 lumens per watt, obtained without any light-outcoupling structures.

Graphical abstract: Self-assembled hierarchical nanostructured perovskites enable highly efficient LEDs via an energy cascade

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Supplementary files

Article information


Submitted
29 Jan 2018
Accepted
12 Mar 2018
First published
12 Mar 2018

Energy Environ. Sci., 2018,11, 1770-1778
Article type
Paper

Self-assembled hierarchical nanostructured perovskites enable highly efficient LEDs via an energy cascade

X. Y. Chin, A. Perumal, A. Bruno, N. Yantara, S. A. Veldhuis, L. Martínez-Sarti, B. Chandran, V. Chirvony, A. S. Lo, J. So, C. Soci, M. Grätzel, H. J. Bolink, N. Mathews and S. G. Mhaisalkar, Energy Environ. Sci., 2018, 11, 1770
DOI: 10.1039/C8EE00293B

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