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24 Dec 2001

Volume 79, Issue 26, pp. 4271-4458

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Triple-layer passivation for longevity of polymer light-emitting diodes

Seung Ho Kwon, Sang Yoon Paik, Oh Jun Kwon, and Jae Soo Yoo

Appl. Phys. Lett. 79, 4450 (2001); http://dx.doi.org/10.1063/1.1428770 (3 pages) | Cited 18 times

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A poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylene vinylene](MEH-PPV) light-emitting diode was coated with passivation layers in order to improve the longevity of conjugated polymer-based diodes. High-density polyethylene (HDPE), which is an insulator, was used as the passivation material in combination with a metal layer to minimize oxygen and water diffusion into the polymer light-emitting diodes. The simplicity of the HDPE(1 μm)/Al–Li(120 nm)/HDPE(1 μm) structure, which was successively thermal coated on the diode, was demonstrated. The longevity of this simple structure was dramatically enhanced after exposure to atmospheric oxygen and moisture. © 2001 American Institute of Physics.
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85.60.Jb Light-emitting devices
81.65.Rv Passivation
78.66.Qn Polymers; organic compounds
78.60.Fi Electroluminescence

Design of lightweight multilayer partitions based on sonic crystals

Antonio Uris, Constanza Rubio, Hermelando Estelles, Juan V. Sanchez-Perez, Rosa Martinez-Sala, and Jaime Llinares

Appl. Phys. Lett. 79, 4453 (2001); http://dx.doi.org/10.1063/1.1425464 (2 pages) | Cited 3 times

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The sound transmission coefficient of different multilayer partitions commonly encountered in buildings has been measured as a function of frequency. Most of the samples studied showed an increase in the sound transmission coefficient over a specific frequency, called the critical frequency, depending on the layer material. However, for partitions built with the same materials, but built with a periodic arrangement of layers, this behavior has not been observed. This kind of periodic multilayer partition can be considered as a sonic crystal, because the stopband corresponding to a one-dimensional sonic crystal with a constant lattice equal to the modulation of the partition is in the same range as the critical frequency of the panel. © 2001 American Institute of Physics.
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43.50.Jh Noise in buildings and general machinery noise
43.55.Rg Sound transmission through walls and through ducts: theory and measurement
43.55.Ev Sound absorption properties of materials: theory and measurement of sound absorption coefficients; acoustic impedance and admittance
43.50.Fe Noise masking systems

Simulation of higher harmonics generation in tapping-mode atomic force microscopy

O. Sahin and A. Atalar

Appl. Phys. Lett. 79, 4455 (2001); http://dx.doi.org/10.1063/1.1429296 (3 pages) | Cited 20 times

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In tapping-mode atomic force microscopy, nonlinear tip–sample interactions give rise to higher harmonics of the cantilever vibration. We present an electrical circuit to model the atomic force microscope cantilever with its first three flexural eigenmodes. An electrical circuit simulator is used to simulate the tapping-mode operation. Amplitude and phase responses of the third flexural eigenmode are obtained for different sample properties. It is found that amplitude and phase of higher harmonics depend highly on sample properties. © 2001 American Institute of Physics.
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07.79.Lh Atomic force microscopes
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