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Title: Structural Investigation of Cesium Lead Halide Perovskites for High-Efficiency Quantum Dot Light-Emitting Diodes

Abstract

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 the small- and wide-angle X-ray scattering. It is confirmed that the size of the NCs decreased as the reaction temperature decreased, resulting stronger quantum confinement. The cubic-phase perovskite NCs were formed despite the reaction temperatures increased from 140 to 180 °C. However, monodispersive NC cubes which are required for densely packing self-assembly film were only formed 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.

Authors:
 [1];  [2]; ORCiD logo [1]; ORCiD logo [3];  [2]
  1. School of Chemical Engineering and Materials Science, Integrative Research Center for Two-Dimensional Functional Materials, Institute of Interdisciplinary Convergence Research, Chung-Ang University, Seoul 06974, Republic of Korea
  2. Department of Physics, Soongsil University, Seoul 06978, Republic of Korea
  3. X-ray Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, United States
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Research Foundation of Korea (NRF); USDOE Office of Science (SC)
OSTI Identifier:
1394806
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Physical Chemistry Letters; Journal Volume: 8; Journal Issue: 17
Country of Publication:
United States
Language:
English

Citation Formats

Le, Quyet Van, Kim, Jong Beom, Kim, Soo Young, Lee, Byeongdu, and Lee, Dong Ryeol. Structural Investigation of Cesium Lead Halide Perovskites for High-Efficiency Quantum Dot Light-Emitting Diodes. United States: N. p., 2017. Web. doi:10.1021/acs.jpclett.7b01709.
Le, Quyet Van, Kim, Jong Beom, Kim, Soo Young, Lee, Byeongdu, & Lee, Dong Ryeol. Structural Investigation of Cesium Lead Halide Perovskites for High-Efficiency Quantum Dot Light-Emitting Diodes. United States. doi:10.1021/acs.jpclett.7b01709.
Le, Quyet Van, Kim, Jong Beom, Kim, Soo Young, Lee, Byeongdu, and Lee, Dong Ryeol. Tue . "Structural Investigation of Cesium Lead Halide Perovskites for High-Efficiency Quantum Dot Light-Emitting Diodes". United States. doi:10.1021/acs.jpclett.7b01709.
@article{osti_1394806,
title = {Structural Investigation of Cesium Lead Halide Perovskites for High-Efficiency Quantum Dot Light-Emitting Diodes},
author = {Le, Quyet Van and Kim, Jong Beom and Kim, Soo Young and Lee, Byeongdu and Lee, Dong Ryeol},
abstractNote = {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 the small- and wide-angle X-ray scattering. It is confirmed that the size of the NCs decreased as the reaction temperature decreased, resulting stronger quantum confinement. The cubic-phase perovskite NCs were formed despite the reaction temperatures increased from 140 to 180 °C. However, monodispersive NC cubes which are required for densely packing self-assembly film were only formed 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.},
doi = {10.1021/acs.jpclett.7b01709},
journal = {Journal of Physical Chemistry Letters},
number = 17,
volume = 8,
place = {United States},
year = {Tue Aug 15 00:00:00 EDT 2017},
month = {Tue Aug 15 00:00:00 EDT 2017}
}