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|Title:||Self-assembled hierarchical nanostructured perovskites enable highly efficient LEDs via an energy cascade||Authors:||Veldhuis, Sjoerd Antonius
Chirvony, Vladimir S.
Lo, Alencious Shu-Zee
Bolink, Henk J.
Mhaisalkar, Subodh Gautam
Chin, Xin Yu
|Issue Date:||2018||Source:||Chin, X. Y., Perumal, A., Bruno, A., Yantara, N., Veldhuis, S. A., & Martínez‐Sarti, L., et al. (2018). Self-assembled hierarchical nanostructured perovskites enable highly efficient LEDs via an energy cascade. Energy & Environmental Science, in press.||Series/Report no.:||Energy & Environmental Science||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 that 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.||URI:||https://hdl.handle.net/10356/88171
|ISSN:||1754-5692||DOI:||10.1039/C8EE00293B||Rights:||© 2018 The Royal Society of Chemistry. This is the author created version of a work that has been peer reviewed and accepted for publication by Energy & Environmental Science, The Royal Society of Chemistry. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1039/C8EE00293B].||Fulltext Permission:||open||Fulltext Availability:||With Fulltext|
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