333 results found
Anthopoulos TD, Setayesh S, Smits E, et al., 2006, Air-stable complementary-like circuits based on organic ambipolar transistors, Advanced Materials, Vol: 18, Pages: 1900-1904, ISSN: 0935-9648
Anthopoulos TD, Kooistra FB, Wondergem H, et al., 2006, Air-stable n-channel organic transistors based on a soluble C84 fullerene derivative, Advanced Materials -Deerfield Beach Then Weinheim-, Vol: 18, Pages: 1679-1684, ISSN: 0935-9648
Anthopoulos TD, Namdas EB, Ruseckas A, et al., 2005, Dendrimers: Efficient solution-processed phosphorescent OLED materials, Pages: 4-7, ISSN: 1083-1312
Dendrimers are an attractive class of solution-processible materials for organic LEDs. Two aspects of recent dendrimer research are reported, giving new insight into the operation of these materials and devices made from them. The first involves the study of triplet-triplet annihilation using intensity-dependent time-resolved luminescence measurements. The dependence of triplet-triplet annihilation on molecular size is studied and suggests annihilation is the result of a Dexter process. The second aspect of the research reported shows how the structure of the dendrimer can be modified so that a host material is not required.
Namdas EB, Markham JPJ, Anthopoulos TD, et al., 2005, Invited paper: Dendrimers - Efficient solution-processed phosphorescent OLED materials, Pages: 1862-1865, ISSN: 0097-966X
Three aspects of recent dendrimer research are reported. It is shown that highly efficient sky blue phosphorescent devices can be made (external efficiency 10.4%, 11 lm/W at 100 Cd/m2), that blending dendrimers provides a simple way of colour tuning, and finally that luminescence quenching by exciton-exciton annihilation in dendrimer films is weak and can be controlled by the dendrimer generation. These results suggest that dendrimers are very attractive solution processible materials for OLEDs. © 2005 SID.
Anthopoulos TD, De Leeuw DM, Setayesh S, et al., 2005, Integrated complementary-like circuits based on organic amblpolar transistors, Pages: 434-439, ISSN: 0272-9172
We report on an approach towards integrated complementary-like circuits based on organic ambipolar transistors. In particular, we show that ambipolar transport can be achieved within a single transistor channel using gold electrodes and a solution processable polymer-small molecule blend as the electroactive material. To demonstrate the suitability of these devices for practical utilisation in logic circuits we realise complementary-like voltage inverters comprised entirely of ambipolar transistors. Moreover, by integrating several such inverters we are able to demonstrate more complex circuits such as ring oscillators. © 2005 Materials Research Society.
Anthopoulos TD, de Leeuw DM, Cantatore E, et al., 2005, Solution processible organic transistors and circuits based on a C-70 methanofullerene, JOURNAL OF APPLIED PHYSICS, Vol: 98, ISSN: 0021-8979
Lo SC, Anthopoulos TD, Namdas EB, et al., 2005, Encapsulated cores: Host-free organic light-emitting diodes based on solution-processible electrophosphorescent dendrimers, Advanced Materials, Vol: 17, Pages: 1945-1948, ISSN: 0935-9648
A method to control the molecular structure of a single material using solution-processible conjugated dendrimers that demonstrate highly efficient, host-free, dendrimer light-emitting diodes (DLED), was presented. It was studied that a control over the intermolecular interactions can be engineered easily with the result showing zero necessity for the host material. It was also studied that the dendrimers are ideal nanomaterials for the development of high-performance phosphorescence materials for the use in electroluminescence applications. Formulation of host-free dendrimers-based organic light emitting diodes (OLED) is a significant step towards development of simple-to-fabricate, low-cost, high-performance organic light-emitting displays.
Lo SC, Anthopoulos TD, Namdas EB, et al., 2005, Encapsulated cores: Host-free organic light-emitting diodes based on solution-processible electrophosphorescent dendrimers, ADVANCED MATERIALS, Vol: 17, Pages: 1945-+, ISSN: 0935-9648
Namdas EB, Anthopoulos TD, Samuel IDW, et al., 2005, Simple color tuning of phosphorescent dendrimer light emitting diodes, APPLIED PHYSICS LETTERS, Vol: 86, ISSN: 0003-6951
Anthopoulos TD, Namdas EB, Ruseckas A, et al., 2005, Invited paper: Dendrimers: Efficient solution-processed phosphorescent OLED materials, 25th International Display Research Conference, Publisher: SOC INFORMATION DISPLAY, Pages: 4-7
Anthopoulos TD, Tanase C, Setayesh S, et al., 2004, Ambipolar organic field-effect transistors based on a solution-processed methanofullerene, ADVANCED MATERIALS, Vol: 16, Pages: 2174-+, ISSN: 0935-9648
Anthopoulos TD, de Leeuw DM, Cantatore E, et al., 2004, Organic complementary-like inverters employing methanofullerene-based ambipolar field-effect transistors, APPLIED PHYSICS LETTERS, Vol: 85, Pages: 4205-4207, ISSN: 0003-6951
Markham JPJ, Namdas EB, Anthopoulos TD, et al., 2004, Tuning of emission color for blue dendrimer blend light-emitting diodes, APPLIED PHYSICS LETTERS, Vol: 85, Pages: 1463-1465, ISSN: 0003-6951
Anthopoulos TD, Shafai TS, 2004, Low frequency capacitance characterization of alpha-phase nickel phthalocyanine/lead interfaces: effects of temperature and oxygen doping, JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, Vol: 65, Pages: 1345-1348, ISSN: 0022-3697
Anthopoulos TD, Frampton MJ, Namdas EB, et al., 2004, Solution-processable red phosphorescent dendrimers for light-emitting device applications, ADVANCED MATERIALS, Vol: 16, Pages: 557-+, ISSN: 0935-9648
Markham JPJ, Anthopoulos TD, Namdas EB, et al., 2004, Conjugated dendrimers: A modular approach to materials for full colour displays, Conference on Organic Light-Emitting Materials and Devices VII, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, Pages: 50-56, ISSN: 0277-786X
Anthopoulos TD, Shafal TS, 2003, Influence of oxygen doping on the electrical and photovoltaic properties of Schottky type solar cells based on alpha-nickel phthalocyanine, THIN SOLID FILMS, Vol: 441, Pages: 207-213, ISSN: 0040-6090
Anthopoulos TD, Markham JPJ, Namdas EB, et al., 2003, Influence of molecular structure on the properties of dendrimer light-emitting diodes, ORGANIC ELECTRONICS, Vol: 4, Pages: 71-76, ISSN: 1566-1199
Anthopoulos TD, Shafai TS, 2003, Alternating current conduction properties of thermally evaporated alpha-nickel phthalocyanine thin films: Effects of oxygen doping and thermal annealing, JOURNAL OF APPLIED PHYSICS, Vol: 94, Pages: 2426-2433, ISSN: 0021-8979
Anthopoulos TD, Shafai TS, 2003, Electrical properties of alpha-nickel phthalocyanine/aluminium interfaces: effects of oxygen doping and thermal annealing, JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, Vol: 64, Pages: 1217-1223, ISSN: 0022-3697
Anthopoulos TD, Markham JPJ, Namdas EB, et al., 2003, Highly efficient single-layer dendrimer light-emitting diodes with balanced charge transport, APPLIED PHYSICS LETTERS, Vol: 82, Pages: 4824-4826, ISSN: 0003-6951
Markham JPJ, Lo SC, Anthopoulos TD, et al., 2003, Highly efficient solution-processible phosphorescent dendrimers for organic light-emitting diodes, Pages: 161-166, ISSN: 1071-0922
Currently, most research into organic light-emitting diodes (OLEDs) has focused on two main classes of materials: small organic molecules and conjugated polymers. An alternative approach is to use conjugated dendrimers. We show that conjugated dendrimers are a promising new class of solution-processible materials for use as the active layer in highly efficient organic LEDs. By optimizing the choice of device structure, host material, and electron transport layer, we can obtain efficiencies of 55 cd/A and power efficiencies of 40 Im/W. This is an excellent result for a spin-coated emissive laver.
Anthopoulos TD, Shafai TS, 2003, Oxygen induced p-doping of alpha-nickel phthalocyanine vacuum sublimed films: Implication for its use in organic photovoltaics, APPLIED PHYSICS LETTERS, Vol: 82, Pages: 1628-1630, ISSN: 0003-6951
Markham JPJ, Anthopoulos TD, Samuel IDW, et al., 2002, Nondispersive hole transport in a spin-coated dendrimer film measured by the charge-generation-layer time-of-flight method, APPLIED PHYSICS LETTERS, Vol: 81, Pages: 3266-3268, ISSN: 0003-6951
Anthopoulos TD, Shafai TS, 2002, Effects of temperature on electronic properties of nickel phthalocyanine thin sandwich film structures, JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS, Vol: 20, Pages: 295-298, ISSN: 0734-2101
Markham JPJ, Lo SC, Male NH, et al., 2002, Efficient electrophosphorescent dendrimer LEDs, 15th Annual Meeting of the IEEE-Lasers-and-Electro-Optics-Society, Publisher: IEEE, Pages: 195-196, ISSN: 1092-8081
Shafai TS, Anthopoulos TD, 2001, Junction properties of nickel phthalocyanine thin film devices utilising indium injecting electrodes, 28th International Conference on Metallurgical Coatings and Thin Films, Publisher: ELSEVIER SCIENCE SA, Pages: 361-367, ISSN: 0040-6090
Anthopoulos TD, Shafai TS, 2001, Junction properties of nickel phthalocyanine thin sandwich film structures using dissimilar electrodes, PHYSICA STATUS SOLIDI A-APPLIED RESEARCH, Vol: 186, Pages: 89-97, ISSN: 0031-8965
Anthopoulos TD, Shafai TS, 2001, Junction Properties of Nickel Phthalocyanine Thin Sandwich Film Structures Using Dissimilar Electrodes, Physica Status Solidi (A) Applied Research, Vol: 186, Pages: 89-97, ISSN: 0031-8965
Multilayer sandwich structures of Au/NiPc/Pb were fabricated in-situ utilising a sequential deposition technique. Electrical measurements were performed on both in-situ and oxygen-doped samples. Under forward bias conditions, at low voltages, Ohmic conduction, and at higher voltages SCLC were identified. However, in the reverse bias, a transition from electrode limited to bulk limited conduction process was evident. Depletion region width as well as the potential barrier height (φb) at the NiPc/Pb interface were calculated from the reverse J-V characteristics yielding values of 183 nm and 1.03 eV, respectively. After exposure to dry air a strong rectifying effect was observed. The latter is suggested to be associated with the change in the work function of NiPc as a result of oxygen adsorption. The potential barrier height for oxygen-doped samples was calculated yielding a value in the range of 0.955-0.96 eV. Hole and trap parameters, for both in-situ and oxygen-doped sample devices were also evaluated. Derived values suggested that trap concentration associated with higher voltage characteristic is significantly higher for the oxygen-doped sample. This type of behaviour is strongly believed to be due to an oxidisation process occurring near the NiPc/Pb interface.
Anthopoulos TD, Shafai TS, 2000, SCLC measurements in nickel phthalocyanine thin films, PHYSICA STATUS SOLIDI A-APPLIED RESEARCH, Vol: 181, Pages: 569-574, ISSN: 0031-8965
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