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P-μc-Si_(1-x)Ge_x:H thin film by VHF-PECVD

optoelectronics Letters 2008年第2期4卷 130-132页

作者： SHANG Ze-ren ZHANG Jian-jun ZHANG Li-ping HU Zeng-xin XUE Jun-ming ZHAO Ying GENG Xin-hua Key Laboratory of Photo-Electronics Thin Film Devices and Technique of Tianjin Key Laboratory of OPtoelectronic Information Science and Technology of Education Ministry Institute of Photo-Electronics Thin Film Devices and Technology Nankai University Tianjin 300071 China

In this paper, a series of boron doped microcrystalline hydrogenated silicon-germanium （p-μc-Si1-xGex：H） was deposited by very high frequency plasma-enhanced chemical vapor deposition （VHF-PECVD） from SiH4 and GeF4 mixtures. The effect of GeF4 concentration on films＇ composition, structure and electrical properties was studied. The results show that with the increase of GeF4 concentration, the Ge fraction x increases. The dark conductivity and crystalline volume fraction increase first, and then decrease. When the GC is 4%, p-μc-Si1-xGex：H material with high conductivity, low activation energy （σ= 1.68 S/cm, E8=0.047 eV）, high crystalline volume fraction （60%） and with an average transmission coefficient over the long wave region reaching 0.9 at the thickness of 72 nm was achieved. The experimental results were discussed in detail.

关键词： VHF-PECVD 薄膜化学纤维光半导体

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Efficient Blue Organic Light-emitting Diodes with Simple Structure Based on N, N′-bis (1-naphthyl)-N, N′-biphenyl-1, 1′-biphenyl-4,4′-diamine

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电子学报(英文版) 2008年第1期17卷 111-114页

作者： LI Lu YU Junsheng LI Qing LOU Shuangling JIANG Yadong LI Wei State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Information University of Electronic Science and Technology of China Chengdu 610054 China

Small molecular Organic light-emitting diodes (OLEDs) with high efficiency composed of 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) and N, N′-bis-(1-naphthyl)-N, N′-biphenyl-1,1′-biphenyl-4,4′- diamine (NPB) as an electron transporting layer and an emitting layer, respectively were studied. Two devices of indium-tin-oxide (ITO)/NPB/BCP/8- hydroxyquinoline aluminum (Alq3)/Mg:Ag and ITO/NPB/BCP/ Mg:Ag with unique simple structure were fabricated. The luminance-voltage and current density-voltage characteristics of devices were investigated. The results demonstrated that the maximum luminance of the double and triple-layer devices is 11500cd/m² and 5000 cd/m² at 15V, respectively. The maximum luminous power efficiency is 1.21m/W at the luminance of 300cd/m ² and the luminous efficiency of 2.7cd/A. The peak of Electroluminescence (EL) spectrum locates at 433nm and the Commissions Internationale d'Eclairage (CIE) coordinates are (0.18, 0.17), which is consistent with the Photoluminescent (PL) spectrum of NPB. The bright blue light emission is independent on the variation of bias voltage. The diversity of device performance with two different structures was discussed.

关键词：有机发光二极管蓝光半导体 NPB BCP

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Study on temperature characteristics of organic light-emitting diodes based on tris-(8-hydroxylquinoline)-aluminum

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Chinese Science Bulletin 2008年第4期53卷 624-631页

作者： SUO Fan YU JunSheng LI WeiZhi LOU ShuangLing DENG Jing JIANG YaDong State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Information University of ElectronicScience and Technology of China Chengdu 610054 China

Both single-layer and double-layer organic light-emitting devices based on tris-(8-hydroxylquinoline)-aluminum(Alq3) as emitter are fabricated by thermal vacuum *** electroluminescent characteristics of these devices at various temperatures are measured,and the temperature characteristics of device performance are *** effect of temperature on device current conduction regime is analyzed in *** results show that the current-voltage(I-V) characteristics of devices are in good agreement with the theoretical prediction of trapped charge limited current(TCLC).In addition,both the charge carrier mobility and charge carrier concentration in the organic layer increase with the rise of temperature,which results in the monotonous increase of Alq3 device *** current conduction mechanisms of two devices at different temperatures are identical,but the exponent m in current-voltage equation changes randomly with *** device luminance increases slightly and the efficiency decreases monotonously due to the aging of Alq3 luminescent properties caused by high temperature.A tiny blue shift can be observed in the electroluminescent(EL) spectra as the temperature increases,and the reduction of device monochromaticity is caused by the intrinsic characteristics of organic semiconductor energy levels.

关键词：有机发光二极管温度载流子活性三-(8-羟基喹啉)铝

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Fluorene-based narrow-band-gap copolymers for red lightemitting diodes and bulk heterojunction photovoltaic cells

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Frontiers of Chemical Science and Engineering 2008年第3期2卷 257-264页

作者： Mingliang SUN Li WANG Yangjun XIA Bin DU Ransheng LIU Yong CAO Institute of Polymer Optoelectronic Materials and Devices Key Laboratory of Special Functional MaterialsSouth China University of TechnologyGuangzhou 510640China

A series of narrow band-gap conjugated copolymers(PFO-DDQ)derived from 9,9-dioctylfluorene(DOF)and 2,3-dimethyl-5,8-dithien-2-yl-quinoxalines(DDQ)is prepared by the palladium-catalyzed Suzuki coupling reaction with the molar feed ratio of DDQ at around 1%,5%,15%,30%and 50%,*** obtained polymers are readily soluble in common organic *** solutions and the thin solid films of the copolymers absorb light from 300-590 nm with two absorbance peaks at around 380 and 490 *** intensity of 490 nm peak increases with the increasing DDQ content in the *** energy transfer due to exciton trapping on narrow-band-gap DDQ sites has been *** PL emission consists exclusively of DDQ unit emission at around 591-643 nm depending on the DDQ content in solid *** EL emission peaks are red-shifted from 580 nm for PFO-DDQ1 to 635 nm for *** highest external quantum efficiency achieved with the device configuration ITO/PEDOT/PVK/PFO-DDQ15/Ba/Al is 1.33%with a luminous efficiency 1.54 cd/*** heterojunction photovoltaic cells fabricated from composite films of PFO-DDQ30 copolymer and[6,6]-phenyl C61 butyric acid methyl ester(PCBM)as electron donor and electron acceptor,respectively in device configuration:ITO/PEDOT:PSS/PFODDQ30:PCBM/PFPNBr/Al shows power conversion efficiencies of 1.18%with open-circuit voltage(V_(oc))of 0.90 V and short-circuit current density(J_(sc))of 2.66 mA/cm^(2)under an AM1.5 solar simulator(100 mW/cm^(2)).The photocurrent response wavelengths of the PVCs based on PFO-DDQ30/PCBM blends covers 300-700 *** indicates that these kinds of low band-gap polymers are promising candidates for polymeric solar cells and red light-emitting diodes.

关键词： 9,9-dioctylfluorene 2,3-dimethyl-5,8-dithien-2-yl-quinoxalines light-emitting diodes solar cells

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Effect of BCP ultrathin layer on the performance of organic light-emitting devices

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optoelectronics Letters 2008年第5期4卷 317-320页

作者： WANG Hong YU Jun-sheng LI Lu TANG Xiao-qing JIANG Ya-dong School of Optoelectronic Information State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 China

Based on conventional double layer device, triple layer organic light-emitting diodes (OLEDs) with two heterostructures of indium-tin oxide (ITO)/N,N'-diphenyl-N,N'-bis(1-naphthyl)(1,1'-biphenyl)-4,4'-diamine(NPB)/2,9-dimethyl-4,7-diphenyl- 1,10-phenanthroline (BCP)/ 8-Hydroxyquinoline aluminum (Alq3)/Mg:Ag using vacuum deposition method have been fabricated. The influence of different film thickness of BCP layer on the performance of OLEDs has been investigated. The results showed that when the thickness of the BCP layer film gradually varied from 0.1 nm to 4.0 nm, the electrolumines- cence (EL) spectra of the OLEDs shifted from green to greenish-blue to blue, and the BCP layer acted as the recombination region of charge carriers related to EL spectrum, enhancing the brightness and power efficiency. The power efficiency of OLEDs reached as high as 7.3 lm/W.

关键词：电致发光器件超薄层 OLEDs 异质结构

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Film thickness effect on the performance of small molecular solar cell

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optoelectronics Letters 2008年第5期4卷 321-323页

作者： LIN Hui YU Jun-sheng HUANG Jiang JIANG Ya-dong State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Information University of Electronic Science and Technology of China （UESTC） Chengdu 610054 China

An efficient organic photovoltaic （OPV） cell with an indium-tin-oxide/CuPc/C60/Ag structure has been investigated by changing the film thickness of organic layers. A high olin-circuit voltage （Yoc） of 0.5 V, a short-circuit current density （Jsc） of 5.81 mA/cm^2, and a high power conversion efficiency （ηp） of 1.2% were achieved at an optimum film thickness. The results demonstrate that material thickness is an important factor to cell optimization, especially for maximizing the absorption rate as will as reducing the cell resistance. Experimental results also indicate that the power conversion efficiency increases from 1.2% to 1.54% as a BCP exciton blocking layer of 10 nm is introduced.

关键词：油膜厚度分子太阳能电池有机层 OPV电池

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Nondoped-type White Organic Light-Emitting Diode Using Star-Shaped Hexafluorenylbenzene as an Energy Transfer Layer

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Chinese Journal of Chemical Physics 2008年第5期21卷 500-504页

作者： Jun-sheng Yu Tao Ma Shuang-ling Lou Ya-dong Jiang Qing Zhang State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Information University of Electronic Science and Technology of China Chengdu 510054 China Department of Polymer Science School of Chemistry and Chemical Technology Shanghai Jiao Tong University Shanghai 200240 China

White organic light-emitting diodes （WOLEDs） with a structure of indium-tin-oxide （ITO）/N,N＇-bis- （1-naphthyl）-N,N＇-diphenyl- （1, 1＇-biphenyl）-4,4＇-diamine （NPB）/1,2,3,4,5,6-hexakis（9,9-diethyl-9H-fluoren-2- yl）benzene （HKEthFLYPh）/5,6,11,12-tetraphenylnaphtacene （rubrene）/tris（8-hydroxyquinoline） aluminum （Alq3）/Mg：Ag were fabricated by vacuum deposition method, in which a novel star-shaped hexafluorenyl- benzene HKEthFLYPh was used as an energy transfer layer, and an ultrathin layer of rubrene was inserted between HKEthFLYPh and Alq3 layers as a yellow light-emitting layer instead of using a time-consuming doping process. A fairly pure WOLED with Commissions Internationale De L＇Eclairage （CIE） coordinates of （0.32, 0.33） was obtained when the thickness of rubrene was 0.3 nm, and the spectrum was insensitive to the applied voltage. The device yielded a maximum luminance of 4816 cd/m2 at 18 V.

关键词： White organic light-emitting diode diethyl-9H-fluoren-2-yl）benzene Energy transfer Star-shaped hexafluorenylbenzene 1 2 3 4 5 6-hexakis（9 9- Ultrathin layer

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Organic electroluminescent characteristics of PS:NPB composite hole transporting layer

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Frontiers of optoelectronics 2008年第Z2期1卷 323-328页

作者： Fan SUO Junsheng YU Jing DENG Shuangling LOU Yadong JIANG State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Information University of Electronic Science and Technology of China

Green organic light-emitting devices with a structure of indium-tin-oxide(ITO)/polystyrene(PS):N,N'-bis-(3-naphthyl)-N,N'-biphenyl-(1,1'-biphenyl)-4,4'-diamine(NPB)/tris-(8-hydroxyquinoline)-aluminum(Alq3)/Mg:Ag were fabricated. A doping system consisting of small-molecular hole transporting material NPB and polymeric matrix PS was applied as a composite hole transporting layer(HTL), and the thin film preparation was simplified via spin-coating technique. By adjusting the component ratio of the doping system, several devices with different concentration proportion of PS:NPB are constructed. The electroluminescent characteristics of the devices were investigated and discussed. This study demonstrated that the difference of doping concentration of NPB has a remarkable impact on the optoelectronic performance of both HTL and the devices. Optimum device performance can be obtained by choosing a suitable concentration proportion of PS:NPB at 1:1. This study contributes to the construction of composite functional layers of organic light-emitting diode(OLED)devices and to the technical modification.

关键词： organic light-emitting device N N′-bis-(3-naphthyl)-N N′-biphenyl-(1 1′-biphenyl)-4 4′-diamine (NPB) polystyrene composite hole transporting layer device performance

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Synthesis, optical and electroluminescent properties of novel polyfluorene/carbazole-based conjugated polyelectrolytes and their precursors

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Frontiers of optoelectronics 2008年第Z2期1卷 299-304页

作者： Wei CAO Haixing DONG Fei HUANG Huilin SHEN Yong CAO Institute of Polymer Optoelectronic Materials and Devices Key Laboratory of Specially Functional Materials of the Ministry of Education South China University of Technology

A series of novel aminoalkyl-substituted fluorene/carbazole-based main chain copolymers with benzothiadiazole(BTDZ) of different contents: poly[3,6-(N-(2-ethylhexyl)carbazole)-(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorene)-4,7-(2,1,3-benzothiadiazole)](PCzN-BTDZ) were synthesized by Suzuki coupling reaction. Through a postpolymerization treatment on the precursor polymer, a corresponding quaternized ammonium polyelectrolyte derivatives: poly[3,6-(N-(2-ethylhexyl)carbazole)-(9,9-bis(3'-((N,N-dimethyl)-N-ethylammonium) propyl)-2, 7-fluorene)-4, 7-( 2, 1,3-benzothiadiazole)] dibromide(PCzNBr-BTDZ) were obtained. It was found that devices from such polymers with high work-function metal cathode such as Al showed similar device performance to that by using low work-function cathode such as Ba, indicating the excellent electron injection ability of these *** efficient energy transfer from fluorene-carbazole segment to the narrow band gap BTDZ site for both the neutral and the quaternized copolymers was also observed. The addition of BTDZ into the polymer main chain can also improve polymer LED(PLED)device performance. When poly(3,4-ethylenedioxythiophene)(PEDOT)/poly(vinylcarbazole)(PVK) was used as an anode buffer, the external quantum efficiency of the copolymer PCzN-BTDZ1 was 0.99%, which was much higher than the copolymer PCzN without the incorporation of BTDZ in the same device configuration.

关键词： conjugated polyelectrolytes electroluminescence carbazole polyfluorene

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Macromol. Rapid commun. 17/2009

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Macromolecular rapid communications 2009年第17期30卷

作者： Gang Liu Ai-Yuan Li Ding An Hong-Bin Wu Xu-Hui Zhu Yuan Li Xin-Rui Miao Wen-Li Deng Wei Yang Yong Cao Jean Roncali Institute of Polymer Optoelectronic Materials and Devices Key Laboratory of Special Functional Materials MOE South China University of Technology (SCUT) Guangzhou 510640 P. R. China.

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