Abstract
We carried out a laser spectroscopic investigation of high-pressure, high-temperature (HTHP) synthetic diamond containing NE8 defects. In the photoluminescence (PL) emission spectra the defects have a zero-phonon line (ZPL) at 794nm. Under 730nm excitation the width and position of the ZPL as well as the Debye-Waller factor showed systematic temperature dependences which were modelled in accordance of a modified model of impurity defects in solids. A strong dependence of the position of the 794nm ZPL on temperature suggests that NE8-containing diamond could be suitable for sensitive optical thermometry above 200K. Further, the PL in the NIR spectral range makes the diamond crystalline particles promising temperature sensors for biomedical applications.
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