Back to Search Start Over

UV-induced charge-state conversion from the negatively to neutrally charged nitrogen-vacancy centers in diamond

UV-induced charge-state conversion from the negatively to neutrally charged nitrogen-vacancy centers in diamond

Authors :
C. X. Li
Q. Y. Zhang
N. Zhou
B. C. Hu
C. Y. Ma
C. Zhang
Z. Yi
Source :
Journal of Applied Physics. 132:215102
Publication Year :
2022
Publisher :
AIP Publishing, 2022.

Abstract

Under ultraviolet (UV) excitation with photon energy larger than 4.5 eV, a charge-state conversion from negatively to neutrally charged nitrogen-vacancy (NV− to NV0) centers in diamond samples is realized. The UV-induced charge-state conversion is found to strongly depend on the N concentration in the sample and the irradiation fluence of the electron beam. For the samples with high N concentrations, low-fluence (2.5 × 1017 cm−2) 10-MeV electron beam irradiation usually leads to UV-induced charge-state conversion efficiency higher than that of the samples irradiated with high fluences (≥2.5 × 1018 cm−2). For the samples with a few ppm N, however, the charge-state conversion efficiency is relatively low in the cases of irradiation fluences in this work. Meanwhile, UV-induced NV0 luminescence exhibits temperature dependence different from that of visible-light excited NV0 or NV− centers; that is, the photoluminescence intensity does not reach saturation at temperatures lower than 135 K but decreases with the decrease in temperature. Based on the photoluminescence excitation spectra of NV0 centers in the UV region, the UV-induced charge-state conversion is suggested to involve free-hole generation, diffusion, and the capture by ground-state NV− centers.

Subjects

Subjects :
General Physics and Astronomy

Details

ISSN :
10897550 and 00218979
Volume :
132
Database :
OpenAIRE
Journal :
Journal of Applied Physics
Accession number :
edsair.doi...........9180c00dd37511032f8f1e5ab2abe02f
Full Text :
https://doi.org/10.1063/5.0125286