title: Piezochromic Carbon Dots with Two-photon Fluorescence.
abstract: Piezochromic materials, which show color changes resulting from mechanical grinding or external pressure, can be used as mechanosensors, indicators of mechano-history, security papers, optoelectronic devices, and data storage systems. A class of piezochromic materials with unprecedented two-photon absorptive and yellow emissive carbon dots (CDs) was developed for the first time. Applied pressure from 0-22.84 GPa caused a noticeable color change in the luminescence of yellow emissive CDs, shifting from yellow (557 nm) to blue-green (491 nm). Moreover, first-principles calculations support transformation of the sp2domains into sp3-hybridized domains under high pressure. The structured CDs generated were captured by quenching the high-pressure phase to ambient conditions, thus greatly increasing the choice of materials available for a variety of applications.
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University, 100 Kexue Road, Zhengzhou, 450001, China.|State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, China.
authors.forename: Siyu
authors.initials: S
authors.lastname: Lu
authors.affiliation: State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China.
authors.forename: Guanjun
authors.initials: G
authors.lastname: Xiao
authors.affiliation: Institute of Atomic and Molecular Physics, Jilin University, Changchun, 130012, China.
authors.forename: Laizhi
authors.initials: L
authors.lastname: Sui
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, China.
authors.forename: Tanglue
authors.initials: T
authors.lastname: Feng
authors.affiliation: Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, S7N5E2, Canada.
authors.forename: Xue
authors.initials: X
authors.lastname: Yong
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, China.
authors.forename: Shoujun
authors.initials: S
authors.lastname: Zhu
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University, 100 Kexue Road, Zhengzhou, 450001, China.
authors.forename: Baojun
authors.initials: B
authors.lastname: Li
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University, 100 Kexue Road, Zhengzhou, 450001, China.
authors.forename: Zhongyi
authors.initials: Z
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Zou
authors.affiliation: Institute of Atomic and Molecular Physics, Jilin University, Changchun, 130012, China.
authors.forename: Mingxing
authors.initials: M
authors.lastname: Jin
authors.affiliation: State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China.|Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, S7N5E2, Canada.
authors.forename: John S
authors.initials: JS
authors.lastname: Tse
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University, 100 Kexue Road, Zhengzhou, 450001, China.
authors.forename: Hu
authors.initials: H
authors.lastname: Yan
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, China.
authors.forename: Bai
authors.initials: B
authors.lastname: Yang
keywords: carbon dots; fluorescence mechanism; high pressure; piezochromic fluorescence; two-photon fluorescence