he photoluminescence spectra of porous Si have been studied. Its timere-solved luminescence spectra show a red shift of luminescencc peak with increasingdelay time after exciting and a nonexponential decay. Several sp...he photoluminescence spectra of porous Si have been studied. Its timere-solved luminescence spectra show a red shift of luminescencc peak with increasingdelay time after exciting and a nonexponential decay. Several spectral bands withdifferent Gaussian center appear by means of the decomposition of a spetrum. Theresuits of our experiments show quantum confined characters in porous Si, and wespeculate that the short wavelength band at 465 nm is the direct band froni P_(15) toP_(25)展开更多
Image storage based on photoinduced alignment in azobenzene liquid-crystalline films is reported.Measurements reveal that the liquid-crystalline film possesses large photoinduced birefringence(Δ_(n)~10^(-2))and perma...Image storage based on photoinduced alignment in azobenzene liquid-crystalline films is reported.Measurements reveal that the liquid-crystalline film possesses large photoinduced birefringence(Δ_(n)~10^(-2))and permanent optical storage characteristics.The photoinduced alignment process is used for storing images.It is clearly demonstrated that the alignment of the azo chromophores as well as the stored image can be controlled by choosing the appropriate polarization of the irradiating light.展开更多
文摘he photoluminescence spectra of porous Si have been studied. Its timere-solved luminescence spectra show a red shift of luminescencc peak with increasingdelay time after exciting and a nonexponential decay. Several spectral bands withdifferent Gaussian center appear by means of the decomposition of a spetrum. Theresuits of our experiments show quantum confined characters in porous Si, and wespeculate that the short wavelength band at 465 nm is the direct band froni P_(15) toP_(25)
基金the National Natural Science Foundation of China under Grant No.59790050.
文摘Image storage based on photoinduced alignment in azobenzene liquid-crystalline films is reported.Measurements reveal that the liquid-crystalline film possesses large photoinduced birefringence(Δ_(n)~10^(-2))and permanent optical storage characteristics.The photoinduced alignment process is used for storing images.It is clearly demonstrated that the alignment of the azo chromophores as well as the stored image can be controlled by choosing the appropriate polarization of the irradiating light.
