Journal
JOURNAL OF LUMINESCENCE
Volume 208, Issue -, Pages 363-370Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2018.12.036
Keywords
h-BN; Ultraviolet luminescence; Phonon replicas; Intravalley scattering; Intervalley scattering; Carbon-oxygen complex; Point defect
Categories
Funding
- Act 211 Government of the Russian Federation [02.A03.21.0006]
- Minobrnauki initiative research project [16.5186.2017/8.9]
- Russian Science Foundation [N16-17-10283]
Ask authors/readers for more resources
The h-BN microcrystalline powder with carbon and oxygen impurities have been studied at 83 and 296 K using Raman and photoluminescence (PL) spectroscopies. The observed blue shift of Raman peaks with temperature decreasing have been discussed. Two series of phonon replicas in PL emission spectra with a zero-phonon line at 4.08 eV have been registered under 4.28 eV excitation. The energy levels model of the impurity (C-N-O-N)-complex responsible for observe luminescence was proposed. It was shown that the optically active center retains its electroneutrality in the processes of radiative recombination under subband (in 4.28 eV) or band-to-band excitation. Possible mechanisms of electron-phonon scattering and phonon replicas forming under subband excitation of (C-N-O-N)-complex were analyzed. It was substantiated that at 83 K the longitudinal optical (h omega(LO) = 174 meV) and transverse acoustic (h omega(TA) = 60 meV) phonons at the middle points of high symmetry in the first Brillouin zone participate in the processes of intravalley (M- and K-scattering) and intervalley (K -> M)-scattering, respectively.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available