RepOD

The experimental data set is related to the article “Isotope Substitution and Polytype Control for Point Defects Identification: The Case of the Ultraviolet Color Center in Hexagonal Boron Nitride".

The low-temperature continuous wave emission spectra in 3.5 – 4 eV spectral region were obtained using the deep UV line (275.4 nm) of Coherent Innova 400 Ar-ion laser as an excitation source. The spectra were dispersed by a Horiba Jobin-Yvon FHR 1000 monochromator, and the signal was detected by a liquid nitrogen-cooled charge-coupled device camera. The spectra were acquired using a grating blazed at 400 nm, with 1200 gr/mm, resulting in a spectral resolution of 0.02 nm. 

The high hydrostatic pressure was obtained with the use of a low-temperature diamond anvil cell (CryoDAC LT, easyLab Technologies Ltd). Argon was used as a pressure-transmitting medium. The DAC was mounted in an Oxford Optistat CF cryostat equipped with a temperature controller for low-temperature measurements. The sample with a diameter of about 100 mm and a thickness of 30 mm was loaded into the cell along with a small ruby ball. The R₁-line ruby luminescence, excited by the second harmonic of an YAG:Nd laser (532 nm), was used for pressure calibration. The half-width of the R₁ line was also used for monitoring hydrostatic conditions in the DAC.