期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 59, 期 28, 页码 11501-11509出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202002641
关键词
CsPbBr3; CsPbI3; nanoplatelets; nanoplates; perovskites
资金
- Sao Paulo Research Foundation (FAPESP) [465452/2014-0]
- CNPq
- CAPES
- FAPESP [2013/16911-2, 2018/15574-6, 2016/02268-9, 2017/11986-5]
- Shell
- ANP (Brazil's National Oil, Natural Gas and Biofuels Agency) through the R&D levy regulation
- INCT/INOMAT (National Institute for Complex Functional Materials) [2014/50906-9]
- National Council for Scientific and Technological Development (CNPq/MCTIC)
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [17/11986-5, 18/15574-6] Funding Source: FAPESP
CsPbX3 perovskite nanoplates (PNPLs) were formed in a synthesis driven by SnX4 (X=Cl, Br, I) salts. The role played by these hard Lewis acids in directing PNPL formation is addressed. Sn4+ disturbs the acid-base equilibrium of the system, increasing the protonation rate of oleylamine and inducing anisotropic growth of nanocrystals. Sn4+ cations influence the reaction dynamics owing to complexation with oleylamine molecules. By monitoring the photoluminescence excitation and photoluminescence (PL) spectra of the PNPLs grown at different temperatures, the influence of the thickness on their optical properties is mapped. Time-resolved and spectrally resolved PL for colloidal dispersions with different optical densities reveals that the dependence of the overall PL lifetime on the emission wavelength do not originate from energy transfer between PNPLs but from the contribution of PNPLs with distinct thickness, indicating that thicker PNPLs exhibit longer PL lifetimes.
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