Multichannel Photoluminescence of Graphene Quantum Dots Across Femtosecond to Cryogenic Timescales

Small 2026 Open access

Read full text
Authors: Hanna Song, Ha Young Lee, Seungkwon Jeon, Seungmin Jeong, Jong Bae Park, Minju Kim, Kwangseuk Kyhm, Robert A. Taylor, Heedae Kim
DOI: 10.1002/smll.202514669
Cited by: 3
References: 44

Abstract

carbon domains, surface functional groups, and structural defects. Yet the spectral overlap among these emissive channels hinders clear identification of their recombination pathways. Here, we investigate multichannel PL dynamics of commercial GQDs using time-resolved and cryogenic PL spectroscopy. PL spectra reveal three distinct peaks: Peak I (443 nm) from π-π* transitions, Peak II (520 nm) from surface-dominated contribution functional states, and Peak III (583 nm) from pyrrolic N-related defects. Time-correlated single-photon counting detects only a 460 nm emission linked to graphitic N traps, indicating that Peaks I-III decay faster than the nanosecond window. Ultrafast optical Kerr-gate measurements further resolve distinct lifetimes for hydroxyl (

Fields of Study & Subjects

Carbon and Quantum Dots Applications Graphene research and applications Silicon Nanostructures and Photoluminescence

Publication details

Journal / source
Small
Publisher
Wiley
Volume
22
Issue
24
Pages
e14669–e14669
Publication date
5 March 2026
Language
EN