Afterglow and thermally stimulated luminescence induced by UV radiation in CVD diamond

✍ Scribed by Barboza-Flores, M. ;Schreck, M. ;Preciado-Flores, S. ;Meléndrez, R. ;Pedroza-Montero, M. ;Chernov, V.

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 324 KB
• Volume: 204
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200776319

✦ Synopsis

Abstract

Afterglow (AG) and thermoluminescence (TL) of CVD diamond UV‐irradiated with wavelength of 200–260 nm at room temperature are reported. The AG curves monotonously decrease with time and are fitted well by the hyperbolic law. The decay times depends on UV wavelength and decreases with the AG intensity increasing. The TL glow curves exhibit two pronounced TL peaks with maxima at about 350 K and 513 K with unstructured signal between them and are fitted well by four TL peaks. The first, 350 K peak with the activation energy of 0.59 eV was supposed to be second kinetics order. The higher temperature peaks at 402 K, 445 K and 513 K with the activation energies of 0.46 eV, 0.49 eV and 0.68 eV, respectively were assumed to be first kinetics order. The comparison of the AG decay times with the kinetics parameters of the 350 K TL peak proved that AG is caused by thermal emptying of the traps responsible for the 350 K peak. The behaviour of AG and 350 K TL peak was described by the model, in which shallow traps, recombination centers and deep thermally disconnected traps are taken into account. The AG and TL creation spectra are practically the same and consists of a broad band, which exponentially increases from 260 nm, reaches a maximum at 240 nm and then begins decreasing. The creation spectra of the AG and TL peaks are the same and closely related with the fundamental absorption of UV light near indirect band gap of diamond. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)