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0New type of fluorescence in hydrogen-terminated nanodiamond
D. Pasternak1*, A. Romshin1, R. Bagramov2, A. Galimov3, A. Toropov3, D. Kalashnikov4, V. Leong4, A. Satanin5, O. Kudryavtsev1, A. Gritsienko6, A. Chernev7, V. Filonenko2, I. Vlasov1
1- Prokhorov General Physics Institute of the Russian Academy of Sciences, 38 Vavilov str, Moscow 119991,
Russia
2- Vereshchagin Institute of High-Pressure Physics of the Russian Academy of Sciences, 14 Kaluzhskoe shosse,
Moscow, Troitsk 108840, Russia 3- Ioffe Institute, 26 Politekhnicheskaya str, 194021, St. Petersburg, Russia 4- Institute of Materials Research and Engineering (IMRE), Agency for Science Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Republic of Singapore 5- National Research University Higher School of Economics, 20 Myasnitskaya str, Moscow 101000, Russia 6- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, 53 Leninskiy pr., Moscow 119991, Russia 7- Laboratory of Nanoscale Biology, Institute of Bioengineering, Ecole Polytechnique Federale de Lausanne,
1015, Lausanne, Switzerland
* dg.pasternak@physics.msu.ru
Fluorescence spectra of nanodiamonds synthesized at high pressure and high temperature (HPHT synthesis) from adamantane and other organic compounds show narrow lines of unknown origin in a spectroscopic range from 500 to 800 nm (2.48-1.55 eV).
We have identified a connection of the narrow fluorescent lines (NFLs) with single substitutional nitrogen and a 2D layer of surface acceptors formed in the H-terminated nanodiamonds. This allowed us to conclude that the new lines originate due to the radiative recombination of donor-acceptor pairs (DAPs) consisting of nitrogen donors and surface acceptors. The next main characteristics of the single DAP fluorescence were determined at room temperature: spectral width 0.5-2 nm; fluorescence lifetime ~1 ns; highest recorded photon emission rate 1.2 million counts/s. Various spectral characteristics of the NFLs were studied within the wide temperature range 10-300 K. The new type of fluorescence found in hydrogen-terminated is promising for use both as a source of single photons and as temperature sensors.
The work was funded by the Russian Science Foundation, Grant № 23-14-00129, https://rscf.ru/project/23 -14-00129/.
