Abstract
Diamond microcrystals containing silicon-vacancy (SiV) defects were synthesized by using a high-pressure high-temperature treatment of a mixture of pertinent organic-inorganic precursors. Photoluminescence of the SiV defects and its temperature dependence (80–400 K) was studied. A strong sharp zero-phonon line (ZPL) at 738 nm was recorded at all temperatures under 488 nm laser excitation. In particular the thermally induced shift of the ZPL was found promising for optical temperature sensing in the near infrared spectral range at biomedically relevant temperatures.
Highlights
Biomedical applications require nontoxic photoresistant optical markers absorbing and emitting in the NIR biological window of biotissues
Diamond microcrystals containing SiV defects were synthesized from a mixture of adamantane (C10H16) and tetraphenylsilane (C24H20Si) in a ratio of Si/C 0.28%
An apparatus of uniaxial compression and the high-pressure chamber of “Toroid15” type were used for the synthesis [3]
Summary
Biomedical applications require nontoxic photoresistant optical markers absorbing and emitting in the NIR biological window of biotissues. Several impurities in diamond, such as SiV and NE8 defect centres with spectrally narrow zero-phonon lines (even at room temperature), satisfy these demands [1,2]
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