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Light Emission from Silicon Nanocrystals - Size Does Matter !
Robert G. Elliman,Andrew R. Wilkinson,Barry Luther-Davies,Marc G. Spooner,Marek Samoc,Max J. Lederer,Nathanael Smith,Tessica D.M. Weijers 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3
A brief overview of two recent Si nanocrystal studies undertaken at the Australian National University is presented: recent work on hydrogen passivation of non-radiative defects and attempts to measure optical gain in waveguide structures. In the rst study, a generalized treatment of hydrogen passivation and desorption is employed to model the in uence of hydrogen on silicon nanocrystal luminescence. Values for reaction-rate parameters are determined from the model and found to be in excellent agreement with values previously determined for paramagnetic Si danglingbond defects (Pb-type centers) found at planar Si/SiO2 interfaces. In the second study, an attempt is made to measure optical gain in silicon nanocrystals by monitoring the intensity of a probe beam propagating in a waveguide structure containing silicon nanocrystals during photo-excitation of the nanocrystals. The probe beam is shown to be attenuated by the excitation demonstrating the dominance of absorptive processes. No gain was observed.
Farman Ullah,Inamullah Khan,Hart, Robert-Spooner,Peter Bailey,Khalil, Said-Khan Korean Society of Applied Entomology 2002 Journal of Asia-Pacific Entomology Vol.5 No.1
Morphological features of the ladybird beetle Stethorus vegans (Blackburn) were studied at 25 $\pm$ $2^{\circ}$ with a photoperiod of 16L: 8D. All stages of S. vahans were examined under a stereo-zoom microscope. Newly laid eggs were translucent white, turning pale yellow after 4-5 hours. The mean egg dimension was 0.36 x 0.19 mm. Eggs laid by unmated females did not hatch or show any signs of development. Newly emerged larvae were white in color, but soon became pale creamy-white. There were four larval instars, which were differentiated from each other by the presence of exuviae and differences in head capsule size. The pre-pupa, not a distinct stage in the life cycle but a quiescent period at the end of the 4th larval instar, lasted for several hours. Pupae were oval, flattened and black-brown with (me hair like setae on their dorsal sides with a mean length and width of 1.06 x 0.74 mm. The adults were oval, convex and black with small yellow setae on their dorsal side.