Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 8, Issue 17, Pages 4140-4147Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.7b01709
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Funding
- NRF [2013R1A1A2011326, NRF-2016K1A3A7A09005585, 2015K1A3A1A59073839, 2017H1D8A1030599]
- Korea Agency for Infrastructure Technology Advancement - Ministry of Land, Infrastructure and Transport [17IFIP-B133622-01]
- DOE Office of Science [DE-AC02-06CH11357]
- National Research Foundation of Korea [2013R1A1A2011326, 2017H1D8A1030599, 2016K1A3A7A09005585] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We have investigated the effect of reaction temperature of hot-injection method on the structural properties of CsPbX3 (X: Br, I, Cl) perovskite nanocrystals (NCs) using small- and wide-angle X-ray scattering. It is confirmed that the size of the NCs decreased as the reaction temperature decreased, resulting in stronger quantum confinement. The cubic-phase perovskite NCs formed despite the fact that the reaction temperatures increased from 140 to 180 degrees C; however, monodispersive NC cubes that are required for densely packing self-assembly film were formed only at lower temperatures. From the X-ray scattering measurements, the spin-coated film from more monodispersive perovskite nanocubes synthesized at lower temperatures resulted in more preferred orientation. This dense-packing perovskite film with preferred orientation yielded efficient light-emitting diode (LED) performance. Thus the dense-packing structure of NC assemblies formed after spin-coating should be considered for high-efficient LEDs based on perovskite quantum dots in addition to quantum confinement effect of the quantum dots.
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