ISSN:
1573-4846
Schlagwort(e):
phosphates
;
optical properties
;
refractive index
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract We have developed the chemical conditions to prepare highly concentrated mixtures of different metallic chlorides (Sn, Al, Cr) and phosphoric acid. We let them dry at room temperature for bulk materials, but for films the temperature of drying can reach 400°C. The structure of bulk compounds have been examined through elastic neutron diffraction experiments correlated with X ray diffraction at large angle. These compounds are amorphous and we observed, using the differential scanning calorimetry at low temperature, that T g values can be determined at more than 100 K below room temperature. This material could be considered as a “liquid glass” at room temperature. Several other metallic elements are under progress to determine if this behavior is depending on the nature of the element. Bulk materials have been codoped with a dye (oxazine) and trivalent erbium ion. By UV excitation of the dye we observed the absorption spectrum Er3+ in the emission band of oxazine, that is an evidence of the energy transfer effect. Films made by spin coating technique have been doped with Dispersed Red 1 (DR 1). We studied the effect of organic additives (hydrosolubles polymers like PVP) on the kinetics of photoisomerisation of DR 1. Films are also used as waveguide. Several modes have been observed and their refractive index values determined.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00486351
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