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SUMMARY:Perovskite nanocrystals: tuneable future for display industry - Ka
 iwen Zhang\, PhD student in Department of Chemical Engineering and Biotech
 nology
DTSTART:20191010T121000Z
DTEND:20191010T130000Z
UID:TALK132415@talks.cam.ac.uk
CONTACT:Dr. Jotis Baronas
DESCRIPTION:Perovskite materials have attracted tremendous research intere
 st for its outstanding optoelectronic properties. As a supernova in light-
 emitting applications\, perovskite-based LEDs have reached high efficienci
 es over 20% [1] whilst keeping the emission linewidth as narrow as 12 nm [
 2]. Thanks to its nanocrystal geometry\, light emission from lead halide p
 erovskites can be precisely tuned to display different colours\; in combin
 ation with variable halide composition\, perovskite LEDs covered the entir
 e visible spectrum\, thus providing opportunities for perovskite-based dis
 play for ultra-high definition\, flexible\, and energy efficient displays.
 \nIn this work\, a novel engineering platform is developed for synthesizin
 g perovskite nanocrystals. Flow chemistry has been widely applied as a ver
 satile tool for nanoparticle synthesis\, and this engineering concept brin
 gs opportunity for controlled growth for perovskite without changing the c
 hemistry. With the help of helical coiled microreactor\, perovskite nanocr
 ystals have been synthesized as quantum dots\, which exhibited strong quan
 tum confinement effect. By altering the flow characteristics in the reacto
 r\, emission from CsPbBr3 quantum dots can be finely tuned towards blue fr
 om green which is observed in CsPbBr3 crystalline thin films. This marks a
  leap towards fully perovskite-based displays.\n\n[1]	K. Lin\, J. Xing\, L
 . N. Quan\, F. P. G. de Arquer\, X. Gong\, J. Lu\, L. Xie\, W. Zhao\, D. Z
 hang\, C. Yan\, W. Li\, X. Liu\, Y. Lu\, J. Kirman\, E. H. Sargent\, Q. Xi
 ong\, Z. Wei\, Nature 2018\, 562\, 245.\n\n[2]	L. Protesescu\, S. Yakunin\
 , M. I. Bodnarchuk\, F. Krieg\, R. Caputo\, C. H. Hendon\, R. X. Yang\, A.
  Walsh\, M. V. Kovalenko\, Nano Lett. 2015\, 15\, 3692.\n
LOCATION:The Richard King Room\, Darwin College
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