TY - JOUR

T1 - Intra-center energy transfer dynamics in Cd1-xMnxTe semi magnetic semiconductors

AU - Vasilyev, Nikolay

PY - 2012

Y1 - 2012

N2 - Intra-center luminescence of Cd1-xMnxTe semi magnetic semiconductors under low excitation density was investigated both experimentally and by Monte-Carlo simulation. Experimental time-resolved spectra of 2 eV-band under different photon energy for excitation were used. The approach revealed that Mn2+-Mn2+excitation energy transfers take place by means of resonant dipole-dipole interaction. Besides energy transfer dynamics is strongly influenced by hopping- assisted quenching. Having been intra-center excitation selective-, mixed- and non-selective types of excitation are proved to occur if photon energy for excitation is increased. This is originated from overlapping of 4T1- and 4T1-states. Under inter-band excitation it was established that Mn2+-ion excitation takes place with the aid of excitonic energy transfer, with excitation energy being centered at exciton energy. Under temperature rise the transfer rate vigorously enhances due to great increase of overlap integral of Mn2+- ions’ side-bands. The quench

AB - Intra-center luminescence of Cd1-xMnxTe semi magnetic semiconductors under low excitation density was investigated both experimentally and by Monte-Carlo simulation. Experimental time-resolved spectra of 2 eV-band under different photon energy for excitation were used. The approach revealed that Mn2+-Mn2+excitation energy transfers take place by means of resonant dipole-dipole interaction. Besides energy transfer dynamics is strongly influenced by hopping- assisted quenching. Having been intra-center excitation selective-, mixed- and non-selective types of excitation are proved to occur if photon energy for excitation is increased. This is originated from overlapping of 4T1- and 4T1-states. Under inter-band excitation it was established that Mn2+-ion excitation takes place with the aid of excitonic energy transfer, with excitation energy being centered at exciton energy. Under temperature rise the transfer rate vigorously enhances due to great increase of overlap integral of Mn2+- ions’ side-bands. The quench

KW - Cd1-xMnxTe

KW - Mn2+-luminescence

KW - energy transfer

KW - Monte-Carlo

KW - 4T1-state

U2 - 10.1016/j.jlumin.2011.12.047

DO - 10.1016/j.jlumin.2011.12.047

M3 - Article

VL - 132

SP - 1215

EP - 1219

JO - Journal of Luminescence

JF - Journal of Luminescence

SN - 0022-2313

IS - 5

ER -