@article{BrehmerFruebingHerkneretal.1995, author = {Brehmer, Ludwig and Fr{\"u}bing, Peter and Herkner, G. and Kaminorz, Yvette}, title = {Pyroelektrische Untersuchungen an d{\"u}nnen Schichten von organischen Seitenkettenpolymeren}, year = {1995}, language = {de} } @article{BrehmerGrasnickHerkneretal.1995, author = {Brehmer, Ludwig and Grasnick, G. and Herkner, G. and Kaminorz, Yvette}, title = {Organic thin film pyrosensors}, year = {1995}, language = {en} } @article{BrehmerKaminorzGrasnicketal.1996, author = {Brehmer, Ludwig and Kaminorz, Yvette and Grasnick, G. and Herkner, G.}, title = {Organic thin film pyrosensors}, year = {1996}, language = {en} } @article{HamaciucBrumaKoepnicketal.2001, author = {Hamaciuc, E. and Bruma, Maria and K{\"o}pnick, Thomas and Kaminorz, Yvette and Schulz, Burkhard}, title = {Synthesis and Study of New Silicon-containing Polyoxadiazoles}, year = {2001}, abstract = {A series of new poly-1,3,4-oxadiazoles has been synthesized by polycondensation reaction of hydrazine sulfate with a mixture of a dicarboxylic acid containing unsaturated bonds and a dicarboxylic acid containing silicon, by using methanesulfonic acid/phosphorus pentoxide as a reaction medium. These polymers were highly thermostable but they were only soluble in strong inorganic acids such as sulfuric or methanesulfonic ones. An alternative way was followed by using the corresponding dihydrazides containing unsaturated bonds and the corresponding diacid chloride containing silicon that reacted in N-methylpyrrolidinone (NMP) to give soluble silicon-containing unsaturated polyhydrazides, which were cyclodehydrated either by thermal or chemical treatment to give the corresponding polyoxadiazoles. Very thin coatings of polyhydrazides and polyoxadiazoles were deposited onto silicon wafers and they showed a very smooth surface, free of pinholes, when studied by atomic force microscopy (AFM). Some polyoxadiazole films showed strong blue photoluminescence.}, language = {en} } @article{HoepfnerFruebingNeumannetal.1996, author = {H{\"o}pfner, Ulf and Fr{\"u}bing, Peter and Neumann, Werner and Kaminorz, Yvette and Brehmer, Ludwig}, title = {Polarization Processes of poly(DMDAAC) films studied by TSD current}, year = {1996}, language = {en} } @phdthesis{Kaminorz1998, author = {Kaminorz, Yvette}, title = {Charakterisierung und Optimierung von Leuchtdioden auf der Basis niedermolekularer und polymerer Heterozyklen}, address = {Potsdam}, pages = {107 Bl. : graph. Darst.}, year = {1998}, language = {de} } @article{KaminorzSchulzBrehmer2000, author = {Kaminorz, Yvette and Schulz, Burkhard and Brehmer, Ludwig}, title = {Optical and Electrical Properties of Substituted 2,5-Diphenyl-1,3,4-Oxadiazoles}, year = {2000}, abstract = {New substituted 2,5-diphenyl-1,3,4-oxadiazoles are reported as luminescent materials in light emitting diodes LEDs . The investigated new oxadiazoles show efficient blue and green emission in single layer devices. The combination with a hole transporting and red emitting polythiophene led to a white emission with higher quantum efficiency (QE).}, language = {en} } @article{KaminorzSmelaInganaesetal.1998, author = {Kaminorz, Yvette and Smela, E. and Ingan{\"a}s, O. and Brehmer, Ludwig}, title = {Sensitivity of polythiophene planar light emitting diodes to oxygen}, year = {1998}, abstract = {Surface light emitting diodes (SLEDs) with a polymer-on-top geometry were used to study the sensitivity of light emission to oxygen. In these devices, pre-fabricated electrodes were coated with a conjugated polymer, which was thus directly exposed to the environment. Oxygen caused an immediate ten-to hundred fold decrease in electroluminescence efficiency relative to that in nitrogen or argon. Above the voltage for light emission, there was a sharp increase in current. Removing the oxygen led to recovery of the light intensity over a period of minutes, but the current returned immediately to its lower, original level. The electroluminescence and photoluminescence spectra were identical and were unaltered in shape by oxygen exposure (only decreasing in size). However, photoluminescence was unaffected by oxygen alone. This result indicates that oxygen does not affect excitons directly, but rather influences an intermediate species on the path to exciton formation, one that is significant only in electroluminescence and not in photoluminescence. Under simultaneous exposure to oxygen and UV light, the photoluminescence irreversibly decreased, presumably due to photo-oxidation}, language = {en} } @article{KaminorzSmelaJohanssonetal.2000, author = {Kaminorz, Yvette and Smela, Elisabeth and Johansson, Tomas and Brehmer, Ludwig and Andersson, Mats R. and Ingan{\"a}s, Olle}, title = {Characteristics of polythiophene surface light emitting diodes}, year = {2000}, abstract = {Surface light emitting diodes SLEDs , in which previously microfabricated electrodes were coated with a conjugated polymer, were made with greatly different electrode spacings 250 nm and 10 or 20 mm and with different electrode material combinations. The fabrication process allowed us to compare several electrode materials. The SLED structures also enabled imaging of the light emission zone with fluorescence video microscopy. Conventional sandwich structures were also made for comparison electrode separation 50 nm. In this study, the emitting layer was poly[3- (2',5'-bis(1'',4'',7''trioxaoctyl)phenyl)-2,2'-bithiophene] (EO-PT), a conjugated polymer based on polythiophene with oligo ethyleneoxide side chains. The current-voltage (I(V)) and light-voltage (L(V)) characteristics of the SLEDs were largely insensitive to electrode separation except at high voltages, at which the current in the devices with the largest separations was limited. Sandwich structures had the same light output at a given current. Light could be obtained in forward and reverse bias from indium tin oxide ITO -aluminum, gold silicide-aluminum, and gold silicide-gold SLEDs, but the turn-on voltages were lowest with the ITO-aluminum devices, and these were also the brightest and most reliable. Adding salt to the EO-PT increased the current and brightness, decreased the turn-on voltages, and made the I(V) characteristics symmetric; thus, a device with an electrode separation of 10 mm had the extraordinarily low turn-on voltage of 6 V. The location of the light emission was at the electron-injecting contact.}, language = {en} } @article{SchulzKaminorzBrehmer1997, author = {Schulz, Burkhard and Kaminorz, Yvette and Brehmer, Ludwig}, title = {New aromatic poly(1,3,4-oxadiazole)s for light emitting diodes}, year = {1997}, abstract = {New aromatic poly(1,3,4-oxadiazole)s were synthesized having excellent film forming properties due to their solubility in common organic solvents. The investigated new polyoxadiazoles can be used as emission material in single layer LED. The poly- oxadiazoles show an emission in the range of blue to yellow light. The external quantum efficiency as well as the turn-on voltage of the devices are influenced when blends of the polyoxadiazole with hole transport materials are used.}, language = {en} }