Formation and origin of multicenter photoluminescence in zeolite-based carbogenic nanodots

Nanoscale
Bolun WangJiyang Li

Abstract

Carbogenic nanodots (CNDs) are inspiring intensive research efforts owing to their excellent optical properties; however, their chemical structures and photoluminescent origins are still under study. Herein, CNDs with interesting multicenter photoluminescence (PL) have been successfully prepared by pyrolysis of organo-templated zeolites. The simultaneously observed excitation-dependent blue and excitation-independent green PL emissions as well as an uncommon ultraviolet-excited cyan emission are quite different from those of the known multicenter emissive CNDs. To get a thorough understanding of the formation of these CNDs and their PL origins, structural characterizations coupled with femtosecond transient absorption and fluorescence lifetime spectra analyses have been employed to study such PL behavior. The results show that the as-prepared CNDs consist of three main batches with different polarities, and they are composed of a combination of six small fluorophores with diverse ratios. The multicenter PL is obtained due to competition between the conjugated domain fluorophores and the surface-occupied functional group fluorophores. This study provides a comprehensive insight into the origin of multicenter photoluminescence in...Continue Reading

References

May 13, 2010·Angewandte Chemie·Haitao LiShuit-Tong Lee
Jun 10, 2011·Journal of the American Chemical Society·Vinay GuptaSuresh Chand
Dec 29, 2011·Journal of the American Chemical Society·Marta J KrysmannEmmanuel P Giannelis
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Nov 10, 2017·Small·Bart van DamKaterina Dohnalová

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Citations

Nov 1, 2018·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Lian Xiao, Handong Sun
Oct 27, 2021·Chemical Communications : Chem Comm·Evelyne BartholomeeusenEduardo Coutino-Gonzalez

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Methods Mentioned

BETA
NMR
transmission
atomic force microscopy
AFM
Fluorescence

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