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제125회 대한화학회 학술발표회 및 총회 A Relationship between Surface Composition and Spectroscopic Properties in CsPbBr3 Perovskite Nanocrystals : Focusing on the Photoluminescence Efficiency

2020년 2월 5일 13시 37분 39초
PHYS.P-231 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
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Physical Chemistry
저자 및
Jumi Park, Dongho Kim*
Department of Chemistry, Yonsei University, Korea
All-inorganic perovskite nanocrystals (NCs) have attracted significant research interest in terms of optoelectronic devices. Among them, colloidal CsPbBr3 perovskite NCs have emerged as promising materials in LED applications. And we have developed CsPbBr3 NCs exhibiting a tremendously high photoluminescence (PL) and structural stability by adding ZnBr2. However, understanding of these outstanding properties is lacking due to the absence of spectroscopic analyses, such as spectral or dynamical characteristics. In this work, we conducted a comparative analysis of photophysical properties for conventional-CsPbBr3 NCs and ZnBr2-CsPbBr3 NCs. First, we analyzed the blinking traces by comparing the single crystal PL intermittency. It has been found that the PL quantum yield for CsPbBr3 NCs is gradually decreasing at the ensemble level, resulting from a significant activation of the Auger-induced blinking. Furthermore, the time-resolved TA dynamics supports that Auger-type energy transfer accelerates the hot carrier cooling time, and thereby the Auger-induced blinking behavior in band-edge state becomes dominant over time. Here, ZnBr2-CsPbBr3 NCs showed a low multiexciton Auger amplitude and therefore had a stable PL emission compared with conventional-CsPbBr3 NCs. At last, we suggest both NCs differ in intraband spacing possibly due to capping ligands, finally leading to suppressed Auger process and higher stability for ZnBr2-CsPbBr3 NCs.