Resonance-Field Dependence in Electrically Detected Magnetic Resonance: Effects of Exchange Interaction

✍ Scribed by Kôichi Fukui; Toshiyuki Sato; Hidekatsu Yokoyama; Hiroaki Ohya; Hitoshi Kamada

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 117 KB
• Volume: 149
• Category: Article
• ISSN: 1090-7807
• DOI: 10.1006/jmre.2000.2277

✦ Synopsis

Resonance-field dependence of signal intensity in electronically detected magnetic resonance (EDMR) has been investigated both theoretically and experimentally. Theoretical expressions presenting the field dependence of EDMR signal intensity are obtained from a quantum mechanical treatment of the Kaplan-Solomon-Mott model, where it is assumed that recombination only occurs through recombination pairs in the singlet spin state. In this study, effects of the exchange interaction in the recombination pair are explicitly taken into account. The resulting expressions show that the EDMR signal intensity is proportional to the square of the resonance field in a low-field region, whereas it becomes constant in a high-field region, which well explains literature experimental results. This paper also presents experimentally obtained variable-frequency (300-900 MHz) EDMR results for light-illuminated crystalline silicone. The experimental data have been analyzed in light of the present theoretical results, and the upper limit of the exchange interaction has been estimated.