TY - JOUR
T1 - Modified spontaneous emission of silicon nanocrystals embedded in artificial opals
AU - Janda, Petr
AU - Valenta, Jan
AU - Rehspringer, Jean Luc
AU - Mafouana, Rodrigue R.
AU - Linnros, Jan
AU - Elliman, Robert G.
PY - 2007/10/7
Y1 - 2007/10/7
N2 - Si nanocrystals (NCs) were embedded in synthetic silica opals by means of Si-ion implantation or opal impregnation with porous-Si suspensions. In both types of sample photoluminescence (PL) is strongly Bragg-reflection attenuated (up to 75%) at the frequency of the opal stop-band in a direction perpendicular to the (1 1 1) face of the perfect hcp opal structure. Time-resolved PL shows a rich distribution of decay rates, which contains both shorter and longer decay components compared with the ordinary stretched exponential decay of Si NCs. This effect reflects changes in the spontaneous emission rate of Si NCs due to variations in the local density of states of real opal containing defects.
AB - Si nanocrystals (NCs) were embedded in synthetic silica opals by means of Si-ion implantation or opal impregnation with porous-Si suspensions. In both types of sample photoluminescence (PL) is strongly Bragg-reflection attenuated (up to 75%) at the frequency of the opal stop-band in a direction perpendicular to the (1 1 1) face of the perfect hcp opal structure. Time-resolved PL shows a rich distribution of decay rates, which contains both shorter and longer decay components compared with the ordinary stretched exponential decay of Si NCs. This effect reflects changes in the spontaneous emission rate of Si NCs due to variations in the local density of states of real opal containing defects.
UR - http://www.scopus.com/inward/record.url?scp=34748907461&partnerID=8YFLogxK
U2 - 10.1088/0022-3727/40/19/008
DO - 10.1088/0022-3727/40/19/008
M3 - Article
SN - 0022-3727
VL - 40
SP - 5847
EP - 5853
JO - Journal Physics D: Applied Physics
JF - Journal Physics D: Applied Physics
IS - 19
M1 - 008
ER -