High Efficient Green Emission from Organic Multi-quantum Wells Structure

Organic green light emitting devices(LEDs)with multi-quantum wells(MQWs)structure were fabricated.Aromatic diamine was used as hole-transporting layer and potential barrier layer;tris(8-hydroxyquinoline)aluminum acted as electron transporting layer and MQWs green emitting layer.The influence of the barrier layer thickness and quantum well number to the device performance was also investigated.The barrier thickness must be thin(such as 4nm)enough to tunnel through and distribute charge carriers uniformly in different wells(mainly electrons).The organic MQWs LEDs showed enhanced electroluminescent efficiencies.Maximum luminous efficiency and external quantum efficiency were 1.241m/W and 1.04%,respectively.

Enhanced Hole Injection and Brightness of Organic Electroluminescent Devices with Indium Tin Oxide Surface Modification Using Oxygen Plasma Treatment

The improvement of indium tin oxide(ITO)anode contact to organic electroluminescent devices via oxygen plama-treatment is investigated.Enhanced hole-injection efficiency improved the performance of organic light-emitting devices.The injection current increased by 1-2 orders of magnitude and the turn-on voltages droped several volts.Much higher injection current could be applied to achieve much higher brightness.Maximum brightness and luminous efficiency can reach to about 4000 cd/m^(2) and 0.31m/W for the structure of ITO/TPD/Alq3/Al,respectively.

Flexible Blue Light Emitting Diodes Made from Dye Doped Poly (N-Vinylcarbazole) with Multilayer Structure

Flexible blue light emitting diodes(LEDs)were fabricated by using poly(N-vinylcarbazole)(PVK)doped with high fluorescence dye,1,1,4,4-tetraphen1-1,3-butadiene(TPB),as a emitter layer,a layer of tris(8-quinolino1ato)aluminum(Ⅲ)(Alq3)as an electron-transporting layer,and a layer of 2-(4-biphenylyl)-5-(4-tertbutypheny)-1-3,4-oxadiazole(PBD)as hole-blocking layer;a cell structure of flexible substrate/indium-tin-oxide/PVK:TPB/PBD/Alq3/Al was employed.In this cell structure,carrier injection from the electrodes to the doped PVK layer and concomitant electroluminescence from doped PVK were observed at room temperature with dcbias voltage of 4V.Blue emission peaks at about 465nm.This kind of LED is about 200μm thick and can be curled or bent repeatedly at sharp angles without failure.

Blue Electroluminescent Diodes Utilizing Blend of Poly (2,5-Dibutoxyphenylene) in Poly (N-Vinylcarbazole)

Blue emission from polymer blends composed of poly(2,5-dibutoxyphenyiene)(PPP)in a matrix polymer poly(N-vinylcarbazole)(PVK)is reported.The light-emitting layer can be fabricated by spin-coating of PPP-PVK blend solution without subsequent processing or heat treatment.A cell structure of glass substrate/indium-tin-oxide/PPP-PVK blend/aluminum is employed.Blue light emission with a peak position at 448nm occurs at a bias of about 8V.

石墨废水双极膜电渗析制酸、碱工艺探讨

石墨废水氯化钠的含量为4%左右,硝酸盐1870mg/L,饱和碳酸钠及20ppm左右的氟离子,pH值11~12。本工艺采用均相膜电渗析工艺对石墨废水进行浓缩,采用3隔室双极膜工艺将浓缩转化为酸碱,本工艺能将石墨废水的氯化钠转化为8%的氢氧化钠和7.3%的盐酸。运行电渗析能耗为14.3k Wh/t,双极膜处理浓盐水能耗为183.96k Wh/t,碱净能耗为2186k Wh/t(不含水泵)。

八钢高炉冶炼钒钛矿生产试验分析

通过对八钢与攀钢冶炼钒钛矿的冶炼基础条件对比,制定了八钢高炉冶炼钒钛矿的工业生产试验方案和目标,并对生产试验过程中的操作制度、铁水质量、炉渣成分及生产组织等的变化规律进行了跟踪和分析,为立足当地矿产资源,持续提升钒钛矿资源的利用率,最终实现八钢公司半钢提钒做好充分的技术准备。