Siddique, A B and Mukhuti, K and Choudhary, S and Pramanick, A K and Hossain, S M and Ray, M (2022) Critical investigation of up-conversion and dual emission from nitrogen functionalized graphene quantum dots. Journal of Luminescence, 244 .
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Abstract
Up-conversion photoluminescence (UCPL) and dual-band photoluminescence (DBPL) are two widely-reported, exotic properties of graphene quantum dots (GQDs). However, both these phenomena can be associated with measurement artefacts. In case of excitation with monochromatic radiation derived from a white light source, the second order of the excitation or the emission signal can cause misleading impressions of UCPL and DBPL. Laser excitations can also generate spurious UCPL and/or DBPL signals due to leaking radiations. Using a spatially separated femtosecond pulsed laser, we find that in nitrogen-functionalized GQDs there is no evidence for DBPL although a real UCPL is hidden behind spurious signals.
| Item Type: | Article |
|---|---|
| Official URL/DOI: | https://10.1016/j.jlumin.2022.118763 |
| Uncontrolled Keywords: | Graphene quantum dots; Photoluminescence; Up-conversion; Dual-band emission; Measurement artefact; Carbon dots; Ultrasonic preparation; Photoluminescence; Nanodots; Photosensitizers; Nanoparticles; Luminescence; Fluorescence; Efficient; Yield |
| Divisions: | Material Science and Technology |
| ID Code: | 8449 |
| Deposited By: | Dr Mita Tarafder |
| Deposited On: | 13 Jul 2022 15:09 |
| Last Modified: | 13 Jul 2022 15:09 |
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