Citations with the tag: LIGHT emitting diodes

Results 1 - 50

• Fluorescence dynamics of phenyl-substituted polyphenylenevinylene�trinitrofluorenone blend systems.
  Im, C.; Lupton, J. M.; Schouwink, P.; Heun, S.; Becker, H.; Ba�ssler, H. // Journal of Chemical Physics; 7/15/2002, Vol. 117 Issue 3, p1395 

  Steady state as well as time-resolved fluorescence of phenyl-substituted polyphenylenevinylene (PhPPV), both in solution and in form of spin-coated films has been measured. In solution the fluorescence decays exponentially with a 1/e decay time of ~700 ps, whereas the 1/e decay in the film is...

• Patterning organic light-emitting diodes by cathode transfer.
  Rhee, Jungsoo; Lee, Hong H. // Applied Physics Letters; 11/25/2002, Vol. 81 Issue 22, p4165 

  A technique is presented for patterning the metal cathode of organic light-emitting diodes that allows for cathode engineering. The technique involves transferring pretreated and prepatterned metal on a substrate onto the surface of organic layers of the device by pressing, utilizing a...

• Emission through one of two metal electrodes of an organic light-emitting diode via surface-plasmon cross coupling.
  Gifford, Dawn K.; Hall, Dennis G. // Applied Physics Letters; 12/2/2002, Vol. 81 Issue 23, p4315 

  We report strong surface emission from an organic light-emitting diode in which the luminescent material resides between two nearly opaque metal electrodes. Experimental and theoretical analyses indicate that cross coupling between surface plasmons on opposite sides of the metal cathode layer...

• Organic single-layer white light-emitting diodes by exciplex emission from spin-coated blends of blue-emitting molecules.
  Mazzeo, M.; Pisignano, D.; Della Sala, F.; Thompson, J.; Blyth, R. I. R.; Gigli, G.; Cingolani, R.; Sotgiu, G.; Barbarella, G. // Applied Physics Letters; 1/20/2003, Vol. 82 Issue 3, p334 

  We report on white electroluminescence (EL) emission from a single-layer light-emitting diode based on a binary blend of organic soluble blue-emitting molecules, i.e., a diamine derivative and a substituted thiophene-1,1-dioxide. Weakly voltage-dependent white color, of coordinates (0.39, 0.40)...

• Realization of high-efficiency/high-luminance small-molecule organic light-emitting diodes: synergistic effects of siloxane anode functionalization/hole-injection layers, and hole/exciton-blocking/electron-transport layers.
  Huang, Qinglan; Cui, Ji; Veinot, Jonathan G. C.; Yan, He; Marks, Tobin J. // Applied Physics Letters; 1/20/2003, Vol. 82 Issue 3, p331 

  High-efficiency/high-luminance small-molecule organic light-emitting diodes (OLEDs) are fabricated by combining thin, covalently-bound triarylamine hole injection/adhesion interlayers with hole- and exciton-blocking/electron transport interlayers in tris(8-hydroxyquinolato)aluminum (III)...

• Electro-optical properties of a polymer light-emitting diode with an injection-limited hole contact.
  van Woudenbergh, T.; Blom, P. W. M.; Huiberts, J. N. // Applied Physics Letters; 2/10/2003, Vol. 82 Issue 6, p985 

  The electro-optical characteristics of a polymer light-emitting diode with a strongly reduced hole injection have been investigated. A silver contact on poly-dialkoxy-p-phenylene vinylene decreases the hole injection by five orders of magnitude, resulting in both a highly reduced light output...

• Optical cavity effects in InGaN/GaN quantum-well-heterostructure flip-chip light-emitting diodes.
  Shen, Y. C.; Wierer, J. J.; Krames, M. R.; Ludowise, M. J.; Misra, M. S.; Ahmed, F.; Kim, A. Y.; Mueller, G. O.; Bhat, J. C.; Stockman, S. A.; Martin, P. S. // Applied Physics Letters; 4/7/2003, Vol. 82 Issue 14, p2221 

  Optical cavity effects have a significant influence on the extraction efficiency of InGaN/GaN quantum-well-heterostructure flip-chip light-emitting diodes (FCLEDs). Light emitted from the quantum well (QW) self-interferes due to reflection from a closely placed reflective metallic mirror. The...

• A high-extraction-efficiency nanopatterned organic light-emitting diode.
  Lee, Yong-Jae; Kim, Se-Heon; Huh, Joon; Kim, Guk-Hyun; Lee, Yong-Hee; Cho, Sang-Hwan; Kim, Yoon-Chang; Do, Young Rag // Applied Physics Letters; 5/26/2003, Vol. 82 Issue 21, p3779 

  To improve light extraction from organic light-emitting diodes (OLEDs), we introduced a photonic crystal pattern into the glass substrate of an OLED. The periodic modulation converts the guided waves in the high-refractive-index indium-tin-oxide/organic layers into external leaky waves. We used...

• Combinatorial fabrication and study of doped-layer-thickness-dependent color evolution in bright small molecular organic light-emitting devices.
  Cheon, K.O.; Shinar, J. // Applied Physics Letters; 9/8/2003, Vol. 83 Issue 10, p2073 

  The behavior of [N,N[sup ']-diphenyl-N,N[sup ']-bis(1-naphthylphenyl)-1,1[sup ']-biphenyl-4,4[sup ']-diamine (a-NPD)]/[5�0.6 wt % [(2-methyl-6-{2-[2,3,6,7-tetrahydro-1H,5H-benzo(i,j)quinolizin-9-yl] ethenyl}-4H-pyran-4-ylidene)propane-dinitrile (DCM2)-doped a-NPD]/[4,4[sup ']-bis(2,2[sup...

• Erratum: �Transparent-cathode for top-emission organic light-emitting diodes� [Appl. Phys. Lett. 82, 2715 (2003)].
  Han, S.; Feng, X.; Lu, Z.H.; Johnson, D.; Wood, R. // Applied Physics Letters; 9/29/2003, Vol. 83 Issue 13, p2719 

  Presents an erratum for the article 'Transparent-cathode for top-emission organic light-emitting diodes,' published in the Volume 82 of 'Applied Physics Letters.'

• Photoirradiation effect on polymer light-emitting device: Separation between recombination zone and photo-oxidized defects.
  Tada, Kazuya; Onoda, Mitsuyoshi // Applied Physics Letters; 10/16/2000, Vol. 77 Issue 16 

  The photoirradiation effect on the characteristics of a polymer light-emitting diode with a semitransparent metal cathode is studied. The electroluminescence intensity as well as the photoluminescence quantum efficiency decreases due to photoirradiation in air, while the external quantum...

• Near-infrared electroluminescence of polymer light-emitting diodes doped with a lissamine-sensitized Nd[sup 3+] complex.
  Slooff, L. H.; Polman, A.; Cacialli, F.; Friend, R. H.; Hebbink, G. A.; van Veggel, F. C. J. M.; Reinhoudt, D. N. // Applied Physics Letters; 04/09/2001, Vol. 78 Issue 15, p2122 

  We report 890 nm luminescence from a neodymium-doped polymer light-emitting diode. The active layer is a blend of poly(dioctylfluorene-co-benzothiadiazole), F8BT, and a lissamine-functionalized terphenyl-based neodymium complex. We detect electroluminescence from both the lissamine (580 nm) and...

• Highly efficient phosphorescence from organic light-emitting devices with an exciton-block layer.
  Ikai, Masamichi; Tokito, Shizuo; Sakamoto, Youichi; Suzuki, Toshiyasu; Taga, Yasunori // Applied Physics Letters; 070/9/2001, Vol. 79 Issue 2 

  One of the keys to highly efficient phosphorescent emission in organic light-emitting devices is to confine triplet excitons generated within the emitting layer. We employ �starburst� perfluorinated phenylenes (C[sub 60]F[sub 42]) as a both hole- and exciton-block layer, and a hole-transport...

• Lithium�fluoride-modified indium tin oxide anode for enhanced carrier injection in phenyl-substituted polymer electroluminescent devices.
  Zhu, Furong; Low, Beeling; Zhang, Keran; Chua, Soojin // Applied Physics Letters; 08/20/2001, Vol. 79 Issue 8, p1205 

  Phenyl-substituted polymer electroluminescent (EL) devices using an insulating lithium�fluoride (LiF) layer between indium tin oxide (ITO) and poly(styrene sulfonate)-doped poly(3,4-ethylene dioxythiophene) (PEDOT) hole transporting layer have been fabricated. By comparing the devices made...

• Barriers to electron extraction in polymer light-emitting diodes.
  Murata, K.; Cina`, S.; Greenham, N. C. // Applied Physics Letters; 08/20/2001, Vol. 79 Issue 8, p1193 

  We have studied the performance of single-layer polymer light-emitting diodes based on a polyfluorene derivative. Hole-only devices show low currents; however, double-carrier devices show high currents and high efficiencies, implying that the presence of electrons in the device enhances hole...

• Room-temperature ultraviolet emission from an organic light-emitting diode.
  Qiu, C. F.; Wang, L. D.; Chen, H. Y.; Wong, M.; Kwok, H. S. // Applied Physics Letters; 10/01/2001, Vol. 79 Issue 14, p2276 

  Ultraviolet emission was obtained from N,N[sup ']-diphenyl-N,N[sup ']-bis(3-methylphenyl)-(1,1[sup ']-biphenyl)-4,4[sup ']-diamine. Gallium nitride was used as a hole-blocking layer to contain the holes. A peak emission wavelength of 400 nm was measured. The external quantum efficiency is about...

• Recombination efficiency in organic single-layer light-emitting diodes at high fields.
  Yang, Shengyi; Xu, Zheng; Wang, Zhenjia; Xu, Xurong // Applied Physics Letters; 10/15/2001, Vol. 79 Issue 16, p2529 

  By considering the interaction between charge carriers recombination and transport through the bulk at high fields, the expression of recombination efficiency for single-layer diodes is presented. By parameters calculation, a maximum recombination efficiency is promised for device...

• Tailoring of light emission properties of functionalized oligothiophenes.
  Caldas, Marilia J.; Pettenati, Emanuele; Goldoni, Guido; Molinari, Elisa // Applied Physics Letters; 10/15/2001, Vol. 79 Issue 16, p2505 

  We investigate theoretically the light emission properties of short oligothiophenes containing a thienyl-S,S-dioxide moiety, which have recently been shown to exhibit strong photoluminescence efficiency and tunability. We find that the dioxide substitution tends to increase the torsion angle...

• Bright white organic light-emitting diode.
  Ko, C. W.; Tao, Y. T. // Applied Physics Letters; 12/17/2001, Vol. 79 Issue 25, p4234 

  A very bright white organic light-emitting diode (OLED) was realized by using a bright blue-emitting layer, 1,7-diphenyl-4-biphenyl-3,5-dimethyl-1,7-dihydrodipyrazolo[3,4-b;4' ,3'-e] pyridine (PAP-Ph), together with a 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyry)4H-pyran (DCM)-doped Alq...

• Current crowding in InAsSb light-emitting diodes.
  Malyutenko, V. K.; Malyutenko, O. Yu.; Podoltsev, A. D.; Kucheryavaya, I. N.; Matveev, B. A.; Remennyi, M. A.; Stus�, N. M. // Applied Physics Letters; 12/17/2001, Vol. 79 Issue 25, p4228 

  High-resolution two-dimensional infrared (IR) imaging of dynamic electronic processes in the surface-emitting p-InAsSb/n-InAsSbP light-emitting diodes (LEDs) (? = 4.3 �m, T > 300 K) showed that forward current crowding drastically decreases efficiency of LEDs with point contacts. Current flows...

• Simulation of charge injection enhancements in organic light-emitting diodes.
  Masenelli, B.; Berner, D.; Bussac, M. N.; Nu�esch, F.; Zuppiroli, L. // Applied Physics Letters; 12/24/2001, Vol. 79 Issue 26, p4438 

  We have investigated by numerical simulation of real devices the reasons for electron injection enhancement due to lithium fluoride (LiF) and for hole injection enhancement due to copper phtalocyanine (CuPc) in organic light-emitting diodes (OLEDs). The reference data introduced in the code were...

• Optimization of white polychromatic semiconductor lamps.
  �ukauskas, A.; Vaicekauskas, R.; Ivanauskas, F.; Gaska, R.; Shur, M. S. // Applied Physics Letters; 01/14/2002, Vol. 80 Issue 2, p234 

  A stochastic method of optimization of a white-light source that relies on additive color mixing of the emissions from colored light-emitting diodes (LEDs) was developed. The method allows for finding the optimal wavelengths of LEDs in order to obtain the best possible trade off between luminous...

• High-efficiency organic electrophophorescent devices through balance of charge injection.
  Jabbour, G. E.; Wang, J.-F.; Peyghambarian, N. // Applied Physics Letters; 3/18/2002, Vol. 80 Issue 11, p2026 

  Balancing the charge injection plays an important role not only in fluorescence-based organic light-emitting devices, but also in the performance of the recently introduced organic electrophosphorescent devices. By achieving a better balance in the injected charges, it is possible to fabricate...

• Nitrogen-doped GaAsP light-emitting diodes with junctions grown by hydride vapor-phase epitaxy.
  Sato, Tadashige; Imai, Megumi // Applied Physics Letters; 4/22/2002, Vol. 80 Issue 16, p2875 

  Nitrogen-doped GaAsP light-emitting diodes (LEDs) with grown junctions have been fabricated on GaP substrates using hydride vapor-phase epitaxy. A p[sup +]/p-layer structure was employed to reduce light absorption and to optimize the carrier concentration at the junction. The carrier...

• CORRECTION.
  Sato, Tadashige; Imai, Megumi // Crain's Cleveland Business; 8/18/2008, Vol. 29 Issue 33, p2 

  A correction to an article depicting industry-wide sales figures for light-emitting diodes is presented.

• Bright idea for LEDs.
  Wiebusch, Bruce // Design News; 5/7/2001, Vol. 57 Issue 9, p22 

  No abstract available.

• Two-Chip Digital Thermometer Delivers 0.4�C Accuracy.
  Jimenez, Ricardo; Salazar, Neftali; Ulises, Mayoral // Electronic Design; 7/8/2002, Vol. 50 Issue 14, p67 

  No abstract available.

• NIST research yields super-bright green LEDs.
  DM // Electronic Design; 9/19/94, Vol. 42 Issue 19, p27 

  Reports on the development of an extremely bright light-emitting diode (LED). Peak wavelengths in the pure-green region of the spectrum; High-quality crystals of pure zinc-selenide; 50-times brighter than commercial green LEDs; Contact information.

• Film star.
  DM // Engineer (00137758); 7/23/2004, Vol. 293 Issue 7656, p46 

  No abstract available.

• Powering Next-Generation Solid-State Lighting.
  Greenland, Paul; Berns, Werner // Power Electronics Technology; May2004, Vol. 30 Issue 5, p34 

  No abstract available.

• Photoluminescence study of crosslinked reactive mesogens for organic light emitting devices.
  Contoret, A. E. A.; Farrar, S. R.; Khan, S. M.; O�Neill, M.; Richards, G. J.; Aldred, M. P.; Kelly, S. M. // Journal of Applied Physics; 2/1/2003, Vol. 93 Issue 3, p1465 

  We study the spectroscopic properties of luminescent liquid crystals which show a glassy nematic phase at room temperature and then form polymer networks by polymerization using ultraviolet light. The reactive mesogens possess fluorene-based aromatic cores with either diene or acrylate...

• Self-consistent analysis of the contact phenomena in low-mobility semiconductors.
  Preezant, Yevgeni; Tessler, Nir // Journal of Applied Physics; 2/15/2003, Vol. 93 Issue 4, p2059 

  Self-consistent solution of charge injection and charge transport in low mobility light emitting diodes (LEDs) is reported. We show that an explicit description of the contact region under the same premise as the transport equations is needed to accurately evaluate the current-voltage...

• Novel sources fuel growth.
  Anderson, Stephen G. // Laser Focus World; Oct2010, Vol. 46 Issue 10, p7 

  The article discusses the fastest growing segments of the photonic components marketplace including light-emitting diodes and the quantum cascade laser.

• LEDs 101.
  Budimer, Miles; Korane, Kenneth // Machine Design; 3/21/2002, Vol. 74 Issue 6, p72 

  Lists several factors which affect the performance of light-emitting diodes. Color; Visibility; Voltage and current.

• Lotus Lights Up LED technology creates one-of-a-kind dining experiences.
  Wilson, Marianne // Nation's Restaurant News; May2003 Supplement, Vol. 2 Issue 2, p12 

  Reports on the use of light-emitting diode (LED) illumination technology at Lotus restaurant in Oklahoma City, Oklahoma. Effect of lighting on the restaurant business; Design of the restaurant; Cost of the LED technology.

• LEDs Intrigue Lamp Manufacturers.
  O'Bryhim, Brendan // Electrical Wholesaling; Jan2001, Vol. 82 Issue 1, p26 

  Reports on hurdles to the use of light emitting diodes (LED) in lamps. Alleviation of problems stemming from incandescent lighting; Challenge of making use of white LED in general lighting; LED initiatives of GE Lighting, Osram Sylvania and Philips Lighting; How the simplicity of an LED makes...

• Getting the most from LED exit signs.
  McCown, Michael // CEE News; Apr99, Vol. 51 Issue 4, p22 

  Presents tips when purchasing light emitting diodes (LED) exit signs. Life expectancy of LEDs; Variations in electrical operating current; Pure direct current versus pulsed operation.

• Shielded LED/Transformer Jack.
  McCown, Michael // ECN: Electronic Component News; May2003, Vol. 47 Issue 5, p1 

  Reports the launch of Ria Connect Inc.'s Shielded light emitting diode/Transformer Jack. Features; Usability; Contact information.

• FUTURE REVENUES FOR OLED DISPLAYS PROJECTED TO GROW 65%.
  McCown, Michael // PC Business Products; May2002, pN.PAG 

  Reports on the growth of the worldwide market for emerging organic light emitting diode (OLED) technogy in 2002. Forecast on the annual growth of OLED displays by 2008; Benefits offered by the technology; Improvements in material and device efficiency of OLED.

• Latching light detectors is frugal with power and parts.
  Smith, Anthony; Travis, Bill // EDN Europe; Oct2002, Vol. 47 Issue 10, p60 

  Focuses on the design of a light detector circuit using light emitting diodes. Process of light detection using the circuit; Functions of various components used in the circuit; Alternative circuit design to lower the power consumption.

• Luke, I Am Your Toothbrush.
  Allen, Joseph Baneth // Boys' Life; Sep2005, Vol. 95 Issue 9, p10 

  Reports on the study being conducted by dental researchers at Forsyth Institute in Boston, Massachusetts on a light emitting device that targets bacteria associated with gum diseases.

• Novel surface emitting laser diode using photonic band-gap crystal cavity.
  Hirayama, Hideki; Hamano, Tetsuko; Aoyagi, Yoshinobu // Applied Physics Letters; 8/5/96, Vol. 69 Issue 6, p791 

  A novel surface emitting laser diode consisting of a three-dimensional (3D) photonic band-gap crystal cavity is proposed. Spontaneous emission is controlled so as to radiate in the lasing direction with a narrow radiation angle by introducing a plane phase shift region into the cavity. The...

• Ink-jet printing of doped polymers for organic light emitting devices.
  Hebner, T. R.; Wu, C. C.; Marcy, D.; Lu, M. H.; Sturm, J. C. // Applied Physics Letters; 2/2/98, Vol. 72 Issue 5 

  Ink-jet printing was used to directly deposit patterned luminescent doped-polymer films. The luminescence of polyvinylcarbazol (PVK) films, with dyes of coumarin 6 (C6), coumarin 47 (C47), and nile red was similar to that of films of the same composition deposited by spin coating. Light emitting...

• Kinetics of charge carrier recombination in organic light-emitting diodes.
  Kalinowski, J.; Camaioni, N.; Di Marco, P.; Fattori, V.; Martelli, A. // Applied Physics Letters; 2/2/98, Vol. 72 Issue 5 

  The temporal behavior of the electroluminescence (EL) from thin-film indium-tin-oxide (ITO)/aromatic diamine (TPD)/Al(III) 8-hydroxyquinoline (Alq[sub 3])/Mg/Ag light-emitting diodes (LEDs) upon the application of a rectangular driving voltage is analyzed in terms of the electron-hole...

• Investigation of electroluminescence from Au/poly-4-dicyanomethylene-4H-cyclopenta[2,1-b:3,4-b']dithiophene/porous Si/Si/Al light emitting diodes.
  Dong, Y.; Bayliss, S. C.; Parkinson, M. // Applied Physics Letters; 3/16/98, Vol. 72 Issue 11 

  We report simple porous silicon-based devices producing stable electroluminescence (EL) by the deposition of a poly-4-dicyanomethylene-4H-cyclopenta[2,1-b:3,4-b[sup ']]dithiophene monolayer (PCDM) into the nanostructure. The structure of these devices is Au/PCDM/porous silicon/Si/Al. The EL...

• Doped organic light emitting diodes having a 650-nm-thick hole transport layer.
  Yamamori, Asuka; Adachi, Chihaya; Koyama, Toshiki; Taniguchi, Yoshio // Applied Physics Letters; 4/27/98, Vol. 72 Issue 17 

  We have succeeded in fabricating a thick-film organic light emitting diode having a doped hole transport layer (DHTL). The basic cell structure is anode DHTL/emitter layer/cathode. The DHTL is composed of a hole transporting polycarbonate polymer (PC-TPB-DEG) and tris(4-bromophenyl)aminium...

• White light emission from exciplex in a bilayer device with two blue light-emitting polymers.
  Chao, Ching-Ian; Chen, Show-An // Applied Physics Letters; 7/27/98, Vol. 73 Issue 4 

  Bilayer polymer light-emitting diodes with two blue light-emitting materials, poly(N-vinylcarbazole) (PVK) and poly(2-dodecyl-p-phenylene) (C12O-PPP), can emit blue or white light, depending on the solvent used in the fabrication of the second layer, C12O-PPP. If hexane (the nonsolvent for PVK)...

• High brightness and efficiency blue light-emitting polymer diodes.
  Grice, A. W.; Bradley, D. D. C.; Bernius, M. T.; Inbasekaran, M.; Wu, W. W.; Woo, E. P. // Applied Physics Letters; 8/3/98, Vol. 73 Issue 5 

  Efficient blue electroluminescence, peaked at 436 nm, is demonstrated from polymer light-emitting diodes operating at high brightness. A dioctyl-substituted polyfluorene was used as the emissive layer in combination with a polymeric triphenyldiamine hole transport layer. The luminance reaches...

• High-efficiency, low-drive-voltage, semitransparent stacked organic light-emitting device.
  Gu, G.; Khalfin, V.; Forrest, S. R. // Applied Physics Letters; 10/26/98, Vol. 73 Issue 17 

  We report a semitransparent, two-color, stacked organic light-emitting device (SOLED) with high efficiency, low drive voltage, and minimal color distortion. The SOLED emits light from both device surfaces. The external quantum efficiencies of the green and red stacked elements are 1% and 0.4%,...

• Diode arrays may light up compact spectrometers.
  Sobczynski, R.; Porter, J.L. // Laser Focus World; Mar95, Vol. 31 Issue 3, p75 

  Reports on the possible use of light-emitting diodes (LEDs) in compact spectrometers. Development of a near-infrared Fourier transform spectrometer, by D.O.M. Associates, that uses an array of light-emitting diodes (LEDs) and has no moving parts; LED modulation process.

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