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15 December 2018 Efficient light-emitting diodes based on in-situ self-assembled perovskite nanocrystals
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We introduce a simple and low-cost approach—drop-coating method—for preparation of in-situ self-assembled perovskite nanocrystals for efficient light-emitting diodes (LEDs). The photoluminescence (PL) spectrum of the self-assembled NFPI4 nanocrystals thin film prepared by the drop-coating method shows blue shift compared with that of the typical NFPI4 thin film prepared by the spin-coating method. In addition, the PL spectra of these self-assembled nanocrystals are tuned from 765 to 725 nm by changing usage amounts of the perovskite precursor solution. More importantly, efficient LEDs with external quantum efficiencies up to 6.8% are achieved based on these self-assembled NFPI4 nanocrystals.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE) 1947-7988/2018/$25.00 © 2018 SPIE
Heyong Wang, Hongling Yu, Xiao-Ke Liu, and Feng Gao "Efficient light-emitting diodes based on in-situ self-assembled perovskite nanocrystals," Journal of Photonics for Energy 8(4), 046002 (15 December 2018).
Received: 8 September 2018; Accepted: 27 November 2018; Published: 15 December 2018

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