Near-infrared emissive carbon dots with 33.96％ emission in aqueous solution for cellular sensing and light-emitting diodes

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2019,（17）
• 页码范围: 1285-1292
• 页数: 8页
• 语种: 英文

摘要

Near-infrared emissive carbon dots (CDs) were synthesized by hydrothermal method.The as-prepared CDs exhibited a relatively high quantum yield (QY) of 33.96％ in an aqueous solution,and the peak toward the near-infrared fluorescence reached 685 nm.The CDs exhibited pH-sensitive characteristics under strong acidic conditions.Even at pH =0,the as-prepared CDs retained a high fluorescence intensity,which proved that they possessed good acid resistance.More importantly,the CDs were sensitive to the Fe3+ changes in living cells.In addition,they could also be used for white and red emissive LEDs.This discovery will expand the use of aqueous-phase high QY CDs in the field of living cell sensing and imaging.