Open AccessRational Design of Multi‐Color‐Emissive Carbon Dots in a Single Reaction System by Hydrothermal
Author(s) -
Wang Boyang,
Yu Jingkun,
Sui Laizhi,
Zhu Shoujun,
Tang Zhiyong,
Yang Bai,
Lu Siyu
Publication year - 2021
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202001453
Subject(s) - materials science , carbon fibers , hydrothermal circulation , light emitting diode , optoelectronics , visible spectrum , aqueous solution , diode , fluorescence , nanotechnology , photochemistry , chemical engineering , optics , chemistry , physics , composite material , composite number , engineering
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 sp 3 ‐hybridized carbon cores with small domains of partially sp 2 ‐hybridized carbon atoms are reported. First‐principle calculations are initially used to predict that the transformation from sp 3 to sp 2 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.