Rational Design of Multi‐Color‐Emissive Carbon Dots in a Single Reaction System by Hydrothermal

Advanced Science

卷:8

Boyang Wang¹  Jingkun Yu¹  Siyu Lu¹  Zhiyong Tang²  Laizhi Sui³  Shoujun Zhu⁴  Bai Yang⁴ 

[1] Green Catalysis Center and College of Chemistry Zhengzhou University Zhengzhou 450000 China;

[2] Henan Institute of Advanced Technology Zhengzhou University Zhengzhou 450000 China;

[3] State Key Lab of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China;

[4] State Key Lab of Supramolecular Structure and Materials College of Chemistry Jilin University Changchun 130012 China;

关键词: carbon dots;    fluorescence mechanism;    multi‐color‐emissive;    phosphors;    two‐photon fluorescence;   

DOI  :  10.1002/advs.202001453

来源: DOAJ

【 摘 要 】

Abstract As an emerging building unit, carbon dots (CDs) have been igniting the revolutionaries in the fields of optoelectronics, biomedicine, and bioimaging. However, the difficulty of synthesizing CDs in aqueous solution with full‐spectrum emission severely hinders further investigation of their emission mechanism and their extensive applications in white light emitting diodes (LEDs). Here, the full‐color‐emission CDs with a unique structure consisting of sp3‐hybridized carbon cores with small domains of partially sp2‐hybridized carbon atoms are reported. First‐principle calculations are initially used to predict that the transformation from sp3 to sp2 hybridization redshifts the emission of CDs. Guided by the theoretical predictions, a simple, convenient, and controllable route to hydrothermally prepare CDs in a single reaction system is developed. The prepared CDs have full‐spectrum emission with an unprecedented two‐photon emission across the whole visible color range. These full‐color‐emission CDs can be further nurtured by slight modifications of the reaction conditions (e.g., temperature, pH) to generate the emission color from blue to red. Finally a flexible LEDs with full‐color emission by using epoxy CDs films is developed, indicating that the strategy affords an industry translational potential over traditional fluorophores.

【 授权许可】

Unknown