In the present study sol gel silica glasses doped with rhodamine dye (Rh6G) and transition metals like silver, copper and iron were prepared at room temperature through sol gel route. The molar concentrations of dye and metal are varied and synthesized to get a uniform dye and metal doped clusters in silica matrices. Structural characterization is performed by SEM and XRD on doped silica glasses. SEM micrographs reveal the size of particles to be 10-50μm. The amorphous structures of the glasses are confirmed by XRD. The absorption spectra are monitored and analyzed. The absorption spectra of fluorescent dye doped sol gel silica glasses are found within the limit of 400-600 nm and the absorption spectra of different metal doped glasses are in the range of 250-350nm. Oscillator strengths of dye doped and metal doped glasses are calculated and compared. Oscillator strength of rhodamine dye doped silica glasses is comparatively higher than the other doped glasses. Silver is seen to have high oscillator strength among the metal doped silica glasses.
A new technique called a pentacene double layer is proposed in this paper to enhance the air stability of the pentacene-based OTFTs. A practically insulating amorphous layer of pentacene (P-II) deposited at very low substrate temperature is used as protective layer above the pentacene active layer (P-I) so that an encapsulation layer of SiO 2 can be deposited without damaging the active layer. This technique reduced the probability of interaction of O 2 and H 2 O with the active pentacene layer to zero during fabrication of the devices (multiple breakdown process), and hence can be fabricated without using nitrogen ambient chamber as a result the devices become highly cost effective.
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