Role of high nitrogen-vacancy concentration on the photoluminescence and Raman spectra of diamond

Abstract: 

We present a photoluminescence (PL) and Raman spectroscopy study of various diamond samples that have high concentrations of nitrogen-vacancy (NV) color centers up to multiple parts per million (ppm). With green, red, and near infrared (NIR) light excitation, we demonstrate that while for samples with a low density of NV centers the signals are primarily dominated by Raman scattering from the diamond lattice, for higher density of NVs we observe a combination of Raman scattering from the diamond lattice and fluorescence from the NV centers, while for the highest NV densities the Raman signals from diamond are completely overwhelmed by the intense NV’s fluorescence. However, under NIR excitation, Raman diamond signatures can be observed for some diamonds. These observations reveal different roles of two mechanisms of light emission and contradict the naïve belief that Raman scattering enables complete characterisation of a diamond crystalline sample.

 

 

https://doi.org/10.1002/pssa.202200299
Autorzy / Authors: 
M. Jani, M. Mrózek, A. M. Nowakowska, P. Leszczenko, W. Gawlik, A. M. Wojciechowski
Czasopismo: 
Phys. Status Solidi A, 2200299
Rok: 
2022
Tematyka badań: 
Nowe materiały
Zastosowania
Spektroskopia laserowa
Inna tematyka