Browsing by Author "Yin, SB"

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Fabrication and raman analysis of ZnSe quantum dots in glass matrix thin films by pulsed laser evaporation
(1998-07-01)
Yin, SB
;
Chen, L
;
Hsieh, WF
;
光電工程學系
;
Department of Photonics
We have successfully fabricated ZnSe-microcrystal-doped silica-glass thin films by pulsed laser evaporation from ZnSe powder embedded in sol-gel glass targets and demonstrated that the spatial cell-elation model call be used to analyze the LO Raman mode of ZnSe semiconductor doped glass thin films. The obtained correlation lengths differ from the real sizes of the particulates observed by scanning electron microscopy which may bz due to the fact that the particulates art polycrystalline, with different orientations separated by grain boundaries, and the correlation length just provides a measure of the separated average grain dimension. The photoluminescence spectrum indicates that the carriers may tunnel through the grain walls in the polycrystalline particulates. Low temperature annealing only causes aggregate of particulates without merging the grain boundaries.
Temperature induced stress of ZnSe quantum dots in glass matrix thin films grown by pulsed laser deposition
(2001-02-01)
Jan, JC
;
Kuo, SY
;
Yin, SB
;
Hsieh, WF
;
光電工程學系
By analyzing the temperature dependent spectral shifts and broadenings of both photoluminescence (PL) and Raman modes from the ZnSe-doped glass thin films grown by pulsed laser deposition, we found that temperature induced stress causes excess shifts of the PL emission bands to higher energies when the samples were kept below 100K. The compressed stress may be a result of the different thermal expansion of the ZnSe nanocrystal and the glass matrix; it is further confirmed by the temperature dependent excess Raman shift in this quantum dot sample as compared with the crystal data in the high-pressure experiment. In addition, we found the activation energies of the nonradiative decay channels associated with the edge-emission and deep-level bands are close to 1TO and 1LO of ZnSe phonon energies.