Well-aligned ZnO nanorod arrays (ZNAs) grown on the ZnO seed layers coated ITO substrates ranging in various times from 1.5 to 5 hr have been fabricated from aqueous solutions at low temperature. Morphologies, crystal...
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Well-aligned ZnO nanorod arrays (ZNAs) grown on the ZnO seed layers coated ITO substrates ranging in various times from 1.5 to 5 hr have been fabricated from aqueous solutions at low temperature. Morphologies, crystalline structure and optical transmission of as-prepared ZNAs were investigated by a scanning electron microscope (SEM), X-ray diffraction (XRD) and UV-Visible transmission spectra, respectively. The results showed that ZNAs grew vertically from the substrates, having uniform diameter and length distribution, the average diameters of ZnO nanorods increased with increasing growth time when growth time was less than 3 hr. The XRD results showed that ZnO nanorods were wurtzite-structured (hexagonal) ZnO. The high optical transmission in the visible region for ZNAs grown in 1.5 hr was also found. Moreover, we fabricated a solar cell, and a PCE of 0.47% was achieved.
Efficient white-polymer-light-emitting devices (WPLEDs) have been fabricated with a single emitting layer containing a hole-transporting host polymer,poly(N-vinylcarbzole),and an electron-transporting auxiliary,1,3-bi...
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Efficient white-polymer-light-emitting devices (WPLEDs) have been fabricated with a single emitting layer containing a hole-transporting host polymer,poly(N-vinylcarbzole),and an electron-transporting auxiliary,1,3-bis[(4-tert-butylphenyl)-1,3,4-oxadiazolyl]-phenylene,codoped with two phosphorescent dyes:Iridium(III)bis (2-(4,6-difluorophenyl)-pyridinato-N,C2') picolinate (FIrpic) and home-made Ir-G2 for blue and red emission,*** the structure of ITO/PEDOT:PSS 4083(40 nm)/emission layer(80 nm)/Ba(4 nm)/Al(120 nm),the device showed a maximal luminous efficiency (LE) of 13.5 cd A-1(corresponding to an external quantum efficiency (EQE) of 6.8%),and a peak power efficiency (PE) of 6.5 lm W-1 at 6.0 ***,the device exhibited pure white emission with Commission Internationale de l'Eclairage (CIE) coordinates of (0.34,0.35) at a current density of 12 mA cm-2,which is very close to the equi-energy white point with CIE coordinates of (0.33,0.33).The device performance can be further optimized when more balanced hole/electron injection is achieved by incorporating a lower conducting type anode buffer layer (PEDOT:PSS) and incorporating poly[(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorenene)-alt-2,7-(9,9-dioctyfluorene)] (PFN) as an electron injection layer at the *** optimized device showed an LE of 24.6 cd A-1 (with an EQE of 14.1%),while the peak power efficiency reached 12.66 lm ***,the WPLEDs showed good electroluminescence (EL) stability over a wide range of operating current density and luminance.
Based on analyzing the features of transverse modes of LD beam and experiment with quartz cylindrical lenses of different diameters, using certain cylindrical lenses to compress the ellipse shaped LD beam in the direc...
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OLEDs were fabricated with a novel fluorene derivative material BDHFLYDFLQ as a molecular probe, exciplex emission was observed in devices with emitting peak locates around 542 nm. However, OLEDs have low efficiency a...
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OLEDs were fabricated with a novel fluorene derivative material BDHFLYDFLQ as a molecular probe, exciplex emission was observed in devices with emitting peak locates around 542 nm. However, OLEDs have low efficiency and brightness because of the existence of exciplex. In order to manipulate the strength of exciplex emission, thin layer of CBP was inserted into the interface of NPB/BDHFLYDFLQ heterojunction. Light emission of exciplex was decreased once CBP was inserted, and emission of electroplex will occur when CBP 15 not thick enough. When the film thickness of CBP layer 15 increased, light emissions of exciplex and electroplex were both eliminated. Light emittied from the device with 6nm CBP layer inserted into NPB/B DHFLYDFLQ interface only characteristic light from BDHFLYDFLQ excitons was observed, and this device had higher external quantum efficiency and lower turn-on voltage.
In this paper, from detailed experiment-based research on how ambient temperature influences the output power of optical-contact crystal green laser, it is showed that the output power of optical-contact crystal laser...
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Partial discharge (PD) is an important indicator of insulation condition in a power transformer. In this paper, an online monitoring system for detecting and locating the PDs using Wireless Sensor Network (WSN) was pr...
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Partial discharge (PD) is an important indicator of insulation condition in a power transformer. In this paper, an online monitoring system for detecting and locating the PDs using Wireless Sensor Network (WSN) was proposed and realized. The system could detect the PDs and locate them with good accuracy. This system had the advantages of easy deployment and low cost. The chip CC2430 was used as a control unit and also used for RF communication in the sensing node. SimpliciTI protocol was adopted for WSN to get good accuracy for time synchronization. Experiments were conducted in a simulated environment and result showed the system was able to measure the location coordinate within a certain error range. The causes of the error and methods of improvement were discussed in this paper .
Amorphous thin films of titanium oxide (TiOx) have been deposited on K9 glass substrates by dc reactive magnetron sputtering from a pure titanium target at different oxygen partial pressure. The structure and composit...
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Amorphous thin films of titanium oxide (TiOx) have been deposited on K9 glass substrates by dc reactive magnetron sputtering from a pure titanium target at different oxygen partial pressure. The structure and composition of these films have been characterized by x-ray diffraction (XRD), and x-ray photoelectron spectroscopy (XPS), respectively. The effects of the oxygen partial pressure on the composition and optical properties of amorphous TiOx thin films have been mainly investigated. Analyses of transmittance, reflectance, optical band gap of the films demonstrate that the oxygen partial pressure during the sputtering plays a very important role in their optical properties.
Small molecular organic solar cells (OSCs) with an inverted structure of indium tin oxide (ITO)/cesium carbonate (Cs 2 CO 3 )/C 60 /subphthalocya- nine(SubPc)/molybdenum oxide (MoO 3 )/Ag were fabri- cated and studied...
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Small molecular organic solar cells (OSCs) with an inverted structure of indium tin oxide (ITO)/cesium carbonate (Cs 2 CO 3 )/C 60 /subphthalocya- nine(SubPc)/molybdenum oxide (MoO 3 )/Ag were fabri- cated and studied. By using the equivalent circuit model and transfer matrix theory, the influence of the thickness of MoO 3 on the electrical and optical characteristics of the device was systematically investigated. The results indicate that at the optimized thickness of 15 nm, the power conversion efficiency was increased to 0.57% under AM 1.5 solar illumination at an intensity of 100 mW/cm 2 . The enhancement of the device performance was attributed to the optical spacer effect and the good protection of active layer from Ag diffusion and charge extraction without introducing more series resistance. Finally, the lifetime measure- ment showed that the stability of OSCs was remarkably enhanced by introducing inverted structure.
The performance of organic solar cells (OSC) based on tin (II) phthalocyanine (SnPc)/C60 heterojunction was investigated by changing the thickness of SnPc. The effect of the film thickness of SnPc on the electrical ch...
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The performance of organic solar cells (OSC) based on tin (II) phthalocyanine (SnPc)/C60 heterojunction was investigated by changing the thickness of SnPc. The effect of the film thickness of SnPc on the electrical characteristics of the device was systematically studies. Optical field distribution inside the OPV cell was also simulated to gain insight into the mechanism responsible for different SnPc thicknesses. The structure, indium tin oxide (ITO)/PEDOT: PSS (10 nm)/MoO3(10 nm)/SnPc(15 nm)/C60(40 nm)/bathophenanthroline (BPhen) (10 nm)/Ag, has a power conver- sion efficiency of 0.79% at 1 sun, standard 1.5G solar illumination.
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