Spectroscopic study of NE8 defect in synthetic diamond for optical thermometry

摘要

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 794 nm. Under 730 nm 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 794 nm ZPL on temperature suggests that NE8-containing diamond could be suitable for sensitive optical thermometry above 200 K. Further, the PL in the NIR spectral range makes the diamond crystalline particles promising temperature sensors for biomedical applications.