Luminescence switching in polymerically confined carbon nanoparticles triggered by UV-light

Indrajit Srivastava, Parikshit Moitra, Dinabandhu Sar, Kevin Wang, Maha Alafeef, John Scott, Dipanjan Pan

Research output: Contribution to journalArticlepeer-review


Photo-caged carbon nanoparticles (CNPs) that are non-luminescent under typical microscopic illumination but can be activated by UV light have been synthesized in this work. Negatively charged "bare"CNPs with high luminescence can lose their photoluminescence (PL) when they are chemically crosslinked to a monomer and subsequently polymerized to form an intra-particulate "caged"network at the nanoscale surface. These caged particles could regain their PL emission upon UV irradiation for a sustained period (∼24 h) resulting in the photolytic cleavage of the polymer network, thus, freeing the nanoscale surface of CNPs, ultimately resulting in six-fold emission enhancement. This reversible "on-off-on"PL switching process was verified by spectroscopic techniques. We successfully demonstrated in this work that CNPs can be switched reversibly between fluorescent and non-fluorescent states by irradiation with light. These results further substantiate that the origin of PL in CNPs is a surface phenomenon and highly dependent on their nanoscale coverage.

Original languageEnglish (US)
Pages (from-to)16288-16295
Number of pages8
Issue number38
StatePublished - Oct 14 2021

ASJC Scopus subject areas

  • General Materials Science


Dive into the research topics of 'Luminescence switching in polymerically confined carbon nanoparticles triggered by UV-light'. Together they form a unique fingerprint.

Cite this