Organic micro/nanocrystals with polymorphic tailorability and perfect platform to modulate decode the complex relationship among molecular structures,supramolecular/noncovalent interactions,aggregates and exciton beha...Organic micro/nanocrystals with polymorphic tailorability and perfect platform to modulate decode the complex relationship among molecular structures,supramolecular/noncovalent interactions,aggregates and exciton behaviors.Herein,we precisely tune the polymorphic two-dimensional organic nanosheets(2DONs)of cyano-spirocyclic aromatic hydrocarbon(2'-CN-SFX),where the crystal growth processes are dominated by precursor concentration.The low concentration(ca.2 mmol/L)affords the rhombus-like nanosheets with monoclinic P21/c space group,in which molecules adopt antiparallel and slipped stacking mode.In contrast,the high concentration(ca.4 mmol/L)favors herringbone-like molecular packing pattern and then generates shuttle-like nanosheets with monoclinic C2/c space group.Both above polymorphic nanosheets exhibit unprecedented crystallization-induced emission en-hancement(CIEE)feature that increases the photoluminescence quantum yields(PLQYs)from 16%in solution,21%in amorphous film to 37%-39%in crystalline states.This result will offer promising opportunities for nanophotonics and organic intelligent semi-conductors.展开更多
基金supported by the National Natural Science Foundation of China(Nos.61604081,61605090,U1301243)the Natural Science Foundation of the Jiangsu Higher Education Institutions(No.16KJB430023)+6 种基金the Doctoral Fund of Ministry of Education of China(No.20133223110007)the Excellent Science and Technology Innovation Team of Jiangsu Higher Education Institutions(2013)the Natural Science Foundation of jiangsu Province(No.BM2012010)the Six Talent Peaks Project of Jiangsu Province(No.XCL-CXTD-009)the Project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions,PAPD(No.YX03002)NUPTSF(Nos.NY215055,NY215061)the Program for Postgraduates Research Innovation in University of Jiangsu Province(No.KYCX200744)。
文摘Organic micro/nanocrystals with polymorphic tailorability and perfect platform to modulate decode the complex relationship among molecular structures,supramolecular/noncovalent interactions,aggregates and exciton behaviors.Herein,we precisely tune the polymorphic two-dimensional organic nanosheets(2DONs)of cyano-spirocyclic aromatic hydrocarbon(2'-CN-SFX),where the crystal growth processes are dominated by precursor concentration.The low concentration(ca.2 mmol/L)affords the rhombus-like nanosheets with monoclinic P21/c space group,in which molecules adopt antiparallel and slipped stacking mode.In contrast,the high concentration(ca.4 mmol/L)favors herringbone-like molecular packing pattern and then generates shuttle-like nanosheets with monoclinic C2/c space group.Both above polymorphic nanosheets exhibit unprecedented crystallization-induced emission en-hancement(CIEE)feature that increases the photoluminescence quantum yields(PLQYs)from 16%in solution,21%in amorphous film to 37%-39%in crystalline states.This result will offer promising opportunities for nanophotonics and organic intelligent semi-conductors.
