Exciton Recombination Processes in Cd1—xMnxSe/ZnSe Quantum Dots under Magnetic Fields

✍ Scribed by K. Shibata; E. Nakayama; I. Souma; A. Murayama; Y. Oka

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 412 KB
• Volume: 229
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/1521-3951(200201)229:1<473::aid-pssb473>3.0.co;2-g

✦ Synopsis

Radiative and non-radiative recombination processes of excitons were studied in quantum dots (QDs) of Cd 1--x Mn x Se. The recombination processes of excitons in the QDs were highly affected by external magnetic fields and the optical excitation power. The short lifetime of QD excitons at zero magnetic field (15 ps) was affected by the Auger recombination of the excitons by transferring the exciton energy to Mn 2+ d electrons in the QDs. The Auger process was suppressed by applying magnetic field in the low power optical excitation of 0.5 W/cm 2 . In higher power excitation of 70 W/cm 2 , the Auger process was not decreased in magnetic field due to the heating of the Mn 2+ ion spins.