Synthesis, photophysical and electroluminescent properties of 1,3-diphenyl-1H-benzo[g]pyrazolo[3,4–b]quinoxaline

Abstract Experimental investigations of electroluminescence spectra for new azaacene derivative have been performed. Azaacene was used as dopant in {PVK} matrices in electroluminescence devices with ITO/PEDOT:PSS/active layer/Ca/Al light-emitting diode configuration. The yellow emission was obtained with the electroluminance of 1530 cd/m2 at 15.0V

Silica-Titania Films Fabricated by Sol-Gel Method for Applications in Planar Photonics

The work presents silica films produced with sol-gel method of extremely different refractive indices as well as two-component waveguide films $SiO_{2}:TiO_{2}$ of very low attenuation

Planar Optical Waveguide Sensor Structures with Grating Couplers

The paper presents optical planar waveguide sensor structures with grating couplers of groove density χ = 2400 g/mm. The waveguide films were obtained using sol-gel method, in which the grating couplers were fabricated by the embossing method. The results of theoretical analysis as well as the results of experimental research have been presented

Sensitive Films for Optical Detection of Ammonia and Nitrogen Dioxide

The sol-gel technology allows preparation of the thin silica films ranging in porosity from dense to highly porous. These films can function as matrix binding molecules of pH-sensitive indicators and can be utilized as sensitive coatings for intensity based planar evanescent wave chemical sensors. This paper is devoted to manufacturing technology and characterization of highly porous silica films deposited on soda-lime glass substrates, impregnated with bromocresole purple and cresole red. Two different methods of impregnation were used: dip coating, which entails sensitization of both silica films deposited on each side of a substrate and selective deposition of a dye solution on single side of the substrate. Manufactured sensitive films were tested toward influence of gaseous ammonia and nitrogen dioxide on their spectral characteristics of the absorption coefficient and the imaginary part of the refractive index. It was shown that bromocresole purple allows detection of both gases: $NH_3$ and $NO_2$

Single-Mode Rib Waveguides Fabricated by Means of Sol-Gel Method

Rib waveguides were fabricated with the use of selective, wet chemical etching of two-component waveguide films $SiO_2:TiO_2$ which were obtained using sol-gel method. Photoresist was applied as a mask in the process. The etching of the films $SiO_2:TiO_2$ was carried out in water solution of ammonia fluoride. The paper presents the results of theoretical analysis as well as the power distributions in the fabricated strip waveguides

Planar Evanescent Wave Ammonia Sensor - Influence of Refractive Index Profile on Sensor Properties

The paper presents the results of the investigations involving the influence of the change of launching conditions on the characteristics of the planar amplitude evanescent wave ammonia sensors. Investigated sensors are based on the channel gradient waveguides, which are produced with the application of the ion exchange in glasses. In our investigations we have tested two sensor structures of different refractive index profiles. The absorption sensitive films were produced using sol-gel technology