Related Experiment Video
Updated: May 24, 2025

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
Heteroatom Doping Effects on the Exciton Behavior in Carbonized Polymer Dots
Zhihong Wei1,2, Xin Yang3, Chengshuang Liao4
1Key Laboratory of Mesoscopic Chemistry of MOE, State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, 210023 Nanjing, China.
Abstract:
Carbonized polymer dots (CPDs) are attractive optoelectronic materials for a variety of applications, but their complex structures hinder a full understanding of their photophysical and excited-state properties. This work illustrates that heteroatom doping (N-doped, N,S-doped, and N,S,F-doped CPDs) significantly affects the exciton behavior of CPDs. It reveals unconventional photoluminescence (PL) blinking with multilevel intensity fluctuations, which depend on the doping type and excitation power density. The multilevel PL blinking is attributed to the formation of charged excitons induced by heteroatom doping, which resembles the characteristic behavior of semiconductor quantum dots. Additionally, nonradiative recombination enhances photothermal conversion efficiency, enabling effective photothermal therapy with significant cytotoxicity against cancer cells. Our results provide compelling evidence that CPDs possess quantum properties similar to those of semiconductors instead of emissive chromophores on the surface, while also highlighting their multifunctionality as photoluminescent probes and photothermal agents.
More Related Videos
Related Concept Videos
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds
π Electron Effects on Chemical Shift: Overview
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
¹³C NMR: ¹H–¹³C Decoupling
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
Variables Affecting Phosphorescence and Fluorescence

