Quanzhou, China

Quanzhou Normal University

Quanzhou, China

Quanzhou Normal University is a public university located in Quanzhou, Fujian province, People's Republic of China. Wikipedia.

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Wu Q.-H.,Quanzhou Normal University
Critical Reviews in Solid State and Materials Sciences | Year: 2013

The oxide/organic interfaces play crucial roles in the hole injection from the anode electrodes to the emitting organics in organic light-emitting diodes (OLEDs), and hence have strong impacts on the efficiencies and other properties of the devices. Indium-tin oxide (ITO) is currently the most popular anode material used in OLEDs due to several merits, such as good etch ability, good adherence, high transparency, low resistivity, and high work function. Interfacial engineering between the ITO electrode and the overlying organic layers is an important process to obtain the high performance of the diode devices. In this article, recent progress in modification of the ITO/organic interfaces is reviewed, as these interfaces are important to the development of the technologies aiming at improving the electroluminescence, and efficiencies as well as reducing the operation voltages of OLEDs. ITO/Organic interfacial properties can be controlled or modified by simply changing the surface properties of ITO using chemical or physical treatments, and by adding a buffer layer (e.g., metal, oxide, or organic thin films) between the ITO and hole transport or emitting organic layers. The literature data showed that the electroluminescence, efficiencies, and lifetimes of the OLEDs could be greatly increased and the operation voltage considerably decreased when the ITO/organic interfaces have been properly improved. © 2013 Taylor and Francis Group, LLC.

Chen W.-C.,Quanzhou Normal University
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2012

Based on the methodology analysis of integrated model of information prediction and evaluation of mineralization prospect, the comprehensive evaluation model of mineralization prospect of linear weighting method and weighted Minkowski distance method are derived based on the assign a value to two states and factor analysis by improving quantity of information method. The quantity of information method was expanded into the construction of geological variable, screening, assignment, which is the base for the spatial analysis and modeling of MapGIS served for evaluation of mineralization prospect with quantitative prediction and evaluation. The spatial analysis model of MapGIS for evaluation of mineralization prospect with quantitative prediction and evaluation was constructed based on the existence of variable and assignment by applying the mixed spatial analysis model. Take iron, copper, lead-zinc ore prospect evaluation in the map of Changkeng in Wuyishan metallogenic belt of scale 1:50000 as example. The model was applied for quantitative prediction and evaluation. 12 metallogenic prospect areas with iron, copper, lead-zinc ore have been delineated, including 3 areas of class A, 3 of class B and 6 of class C.

Yu Y.,Quanzhou Normal University | Yu Y.,University of Dayton | Zhan Q.,University of Dayton
Optics Express | Year: 2015

A simple and flexible method is presented for the generation of optical focal field with prescribed characteristics. By reversing the field pattern radiated from a uniform line source, for which the electric current is constant along its extent, situated at the focus of a 4Pi focusing system formed by two confocal high-NA objective lenses, the required illumination distribution at the pupil plane for creating optical focal field with desired properties can be obtained. Numerical example shows that an arbitrary length optical needle with extremely high longitudinal polarization purity and consistent transverse size of ∼0.36λ over the entire depth of focus (DOF) can be created with this method. Coaxially double-focus with spot size of ∼0.36λ in the transversal direction and ∼λ in the axial direction separated by a prescribed spacing is illustrated as another example. The length of optical needle field and the interval between double-focus are determined by the length of uniform line source. These engineered focal fields may found potential applications in particle acceleration, optical microscopy, optical trapping and manipulations. © 2015 OSA.

Zhang J.,Quanzhou Normal University | Yang X.,Quanzhou Normal University
Information Sciences | Year: 2010

In order to analyze the logical foundation of fuzzy reasoning, this paper first introduces the concept of generalized roots of theories in Łukasiewicz propositional fuzzy logic Łuk, Gödel propositional fuzzy logic Göd, Product propositional fuzzy logic Π, and nilpotent minimum logic NM (the R 0-propositional fuzzy logic L). Next, it is proved that all consequences of a theory Γ, named D(Γ), are completely determined by its generalized root whenever Γ has a generalized root. Moreover, it is proved that every finite theory Γ has a generalized root, which can be expressed by a specific formula. Finally, we demonstrate the existence of a non-fuzzy version of Fuzzy Modus Ponens (FMP) in Łuk, Göd, Π and NM (L), and we provide its numerical version as a new algorithm for solving FMP. © 2010 Elsevier Inc. All rights reserved.

Lin S.-D.,Quanzhou Normal University
IST 2013 - 2013 IEEE International Conference on Imaging Systems and Techniques, Proceedings | Year: 2013

The purpose of this paper is to study a new method of de-noising images corrupted with additive white Gaussian noise. Based on the Chen-Mobius transform, the idea of modulation and demodulation in Chen-Mobius communication system is applied in the image de-noising. The evaluation results of the Chen-Mobius transform of some often-used waveforms are applied in the anti-noise of image. For image de-noising, the data is modulated on a modulation wave for some period and recorded by a certain means, then the data can be carried everywhere. To make such a processing, the Chen-Mobius inverse transformed functions act as the 'modulation' waveforms and the receiving end is coherently 'demodulated' by the often-used digital waveforms. Simulation results are discussed in some detail. It shows that the new application has excellent performances that the digital image signals can be restored from intense Gaussian noise. Here, to prove the performance of the proposed method, the results are compared with other existent methods or algorithms such as hard and soft threshold based on wavelet. The simulation results on several testing images indicate that the proposed method outperforms the other methods in peak signal to noise ratio and keeps better visual in edges information reservation as well. The results also suggest that Chen-Mobius transform can achieve a better performance than the wavelet transform in image de-noising. © 2013 IEEE.

Yang H.,Quanzhou Normal University
Guangxue Xuebao/Acta Optica Sinica | Year: 2013

White organic light-emitting device (WOLED) based on fluorescent sub-monolayer combining with phosphorescent doping layer is fabricated, in which fluorescent material 4, 4'-bis(2, 2'-diphenyl vinyl)-1, 1'-biphenyl (DPVBi) acts as blue emitter layer, sub-monolayer [2-methyl-6- [2-(2, 3, 6, 7-tetrahydro-1H, 5H-benzo[ij] quinolizin-9-yl) ethenyl]-4H-pyran-4-ylidene] propane-dinitrile (DCM2) inserted in the blue emitter layer acts as red emitter layer, fac tris (2-phenylpyridine) iridium [Ir(ppy)3] doped into 4, 4'-N, N'-dicarbazole-biphenyl(CBP) host acts as green emitter layer, respectively. The structure of device is ITO / NPB(40 nm )/DPVBi (8 nm) /DCM2(d)/CBP:Ir(ppy)3 8% (15 nm)/4, 7 -diphenyl-1, 10-phenanthroline (BPhen) (60 nm)/LiF (1 nm)/Al (200 nm). The device performance is controlled by varying the thickness of DCM2. The maximum current efficiency and maximum luminance of the device with the DCM2 thickness of 0.05 nm DCM2 are 7.60 cd/A, 15 420 cd/m2, respectively. The commission international eclairage (CIE) color coordinates of the device vary from (0.34, 0.44) at 4 V to (0.27, 0.33) at 12 V. In order to further improve the performance of WOLED, the BPhen is used as exciton block-layer to the WOLED, the maximum current efficiency and maximum luminance of the device with BPhen thickness of 5 nm are 10.56 cd/A at 4 V, 25960 cd/m2 at 13 V, respectively. The CIE color coordinates of the device vary from (0.34, 0.44) at 4 V to (0.28, 0.36) at 12 V that are general within the white region. The results show that, compared with that of without exciton block- layer, the devices employing exciton block-layer yield higher device performance as well as comparatively stable electroluminescence spectra and CIE color coordinates results stable white emission.

Weng D.,Quanzhou Normal University
Proceedings - 2010 WASE International Conference on Information Engineering, ICIE 2010 | Year: 2010

Inflation forecasts becomes a key input of monetary policy decision. CPI is a measure of inflation, however, an important economic indicator .Based on the monthly CPI data from January 2000 to December 2009,the thesis firstly statistically indentifies the correlation function and the partial correlation function of consumer price index, tests the stationarity of ADF, then uses ARIMA model to test residual serial autocorrelation,lastly makes a short-term estimation on monthly CPI of our country in 2010. Empirical results show that ARIMA (12,1,12) model provides a better prediction for the monthly consumer price index (CPI) of our country in 2010. CPI forecast based on the results of the Government formulating appropriate monetary policy. © 2010 IEEE.

Zhang Z.G.,Quanzhou Normal University
Applied Mechanics and Materials | Year: 2012

When both SnO2 film and a-Si film with infinite square resistance are deposited on an ITO film, the square resistance of the ITO film notably decreases. This phenomenon is more remarkable, when an ITO film has large square resistance. We believe that the films are composed of spaced crystalline grains. The film resistance is due to crystal boundary scattering carriers. Smaller crystalline grain and greater distance to the crystal boundary lead to fiercer scattering. The crystalline grains of the SnO2 film and a-Si film short-circuit the spaced ITO grains to form bridges so interface electrons can flow trough. © (2012) Trans Tech Publications, Switzerland.

Yang H.,Quanzhou Normal University
Journal of Luminescence | Year: 2013

White organic light-emitting devices have been realized by using highly blue fluorescent dye 4,4′-Bis(2,2-diphenyl-ethen-1-yl)-4,4′-di- (tert-butyl)phenyl(p-TDPVBi) and [2-methyl-6-[2-(2, 3,6,7-tetrahydro-1H, red fluorescent dye 5H-benzo[ij] quinolizin-9-yl) ethenyl]-4H-pyran-4-ylidene] propane-dinitrile(DCM2), together with well known green fluorescent dye quinacridone (QAD). The fabrication of multilayer WOLEDs did not involve the hard-to-control doping process. The structure of the device is ITO/m-MTDATA (45 nm)/NPB(8 nm)/p-TDPVBi(15 nm)/DCM2(x nm)/Alq3 (5 nm)/QAD(y nm)/Alq3(55 nm)/LiF(1 nm)/Al, where 4,4′,4′′- tris{N,-(3-methylphenyl)-N-phenylamine}triphenylamine (m-MTDATA) acts as a hole injection layer, N,N′-bis-(1-naphthyl)-N, N′-diphenyl-1, 1′-biph-enyl-4, 4′-diamine (NPB) acts as a hole transport layer, p-TDPVBi acts as a blue emitting layer, DCM2 acts as a red emitting layer, QAD acts as a green emitting layer, tris-(8-hydroxyquinoline) aluminum (Alq 3) acts as an electron transport layer, and WOLEDs of devices A, B, C and D are different in layer thickness of DCM2 and QAD, respectively. To change the thickness of dual sub-monolayer DCM2 and QAD, the WOLEDs were obtained. When x, y=0.05, 0.1, the Commission Internationale de 1'Eclairage (CIE) coordinates of the device change from (0.4458, 0.4589) at 3 V to (0.3137, 0.3455) at 12 V that are well in the white region, and the color temperature and color rendering index were 5348 K and 85 at 8 V, respectively. Its maximum luminance was 35260 cd/m2 at 12 V, and maximum current efficiency and maximum power efficiency were 13.54 cd/A at 12 V and 6.68 lm/W at 5 V, respectively. Moreover, the current efficiency is largely insensitive to the applied voltage. The electroluminescence intensity of white EL devices varied only little at deferent dual sub-monolayer. Device D exhibited relatively high color rendering index (CRI) in the range of 88-90, which was essentially voltage-independent. © 2013 Elsevier B.V.

Wu Q.-H.,Quanzhou Normal University
Spectroscopy Letters | Year: 2014

Multilayer graphene-enclosed nickel nanoparticles have been prepared on the SiO2/Si substrate using chemical vapor deposition. Rhodamine 6 G was used as a molecule probe to detect if the multilayer graphene-enclosed nickel nanoparticles can be applied in surface-enhanced Raman spectroscopy. The experimental results indicated that the Raman signals of C-C stretching within the benzene ring of rhodamine 6 G can be observed only on the multilayer graphene-enclosed nickel nanoparticle substrate rather than on reference substrates such as SiO2/Si and Ni/SiO2/Si. This suggests that the mechanism of Raman enhancement for rhodamine 6 G molecules on graphene is through the π-π bond coupling between them. © 2014 Copyright Taylor & Francis Group, LLC.

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