Structural Investigation of Cesium Lead Halide Perovskites for High-Efficiency Quantum Dot Light-Emitting Diodes
- Authors
- Quyet Van Le; Kim, Jong Beom; Kim, Soo Young; Lee, Byeongdu; Lee, Dong Ryeol
- Issue Date
- 7-Sep-2017
- Publisher
- AMER CHEMICAL SOC
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY LETTERS, v.8, no.17, pp.4140 - 4147
- Journal Title
- JOURNAL OF PHYSICAL CHEMISTRY LETTERS
- Volume
- 8
- Number
- 17
- Start Page
- 4140
- End Page
- 4147
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/6249
- DOI
- 10.1021/acs.jpclett.7b01709
- ISSN
- 1948-7185
- 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 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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