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1、高效高效湿湿处理的理的第一页，本课件共有19页Outline概述概述实验实验结果讨论结果讨论总结总结第二页，本课件共有19页 全色显示 固体照明光源 液晶显示的背光源WOLED高的发光效率；高的显色指数；较高的寿命；绿色、面光源、无辐射第三页，本课件共有19页电子的能量状态单重态单重态S表示所有电子都是自旋配对的（大多数基态分子都处于单重态）三重态三重态 T表示电子在跃迁过程中伴随着自旋方向的变化（自旋平行）激发分子从激发分子从第一激发单重态的最低振动能级第一激发单重态的最低振动能级跃迁到基态各振动能级跃迁到基态各振动能级时所产生的光子辐射称为时所产生的光子辐射称为荧光荧光。激发分子由激发分子
2、由第一激发三重态的最低振动能级第一激发三重态的最低振动能级跃迁到基态各振动能级跃迁到基态各振动能级时所产生的光子辐射称为时所产生的光子辐射称为磷光磷光。基态基态单重态单重态S三重态三重态TE第四页，本课件共有19页其中其中S0、S1和和S2分别表示分子的基态、第一和第二电子激发的单重态分别表示分子的基态、第一和第二电子激发的单重态T T1 1和和T T2 2则分别表示分子的第一和第二电子激发的三重态。则分别表示分子的第一和第二电子激发的三重态。V=0V=0、1 1、2 2、3 3、表示基表示基态和激和激发态的振的振动能能级。S2S1S0T1吸吸收收发发射射荧荧光光发发射射磷磷光光系间跨越系间跨
3、越内转换内转换振动弛豫振动弛豫能能量量l l 2l l 1l l 3 外转换l l 2T2内转换内转换振动弛豫振动弛豫第五页，本课件共有19页第六页，本课件共有19页 The blue-emitting component used in a WOLED comes through from fluorescent DPVBi(4,40-bis(2,2-diphenylethenyl)biphenyl),Sprio-fluorenes,Super p-conjugating molecules like anthracene and perylene,carbazole or tripheny
4、lamine modified molecules,transition metal co-mplexes to phosphorescent fluorine substituted iridium complexes,e.g.FIrpic,iridium(III)bis(4,6-difluorophenyl)-pyridinato-N,C2picolinate.In all these reports,the blue emitting material is completely different from the green,yellow or red color emitting
5、materials in both chemical structure and physical property.第七页，本课件共有19页In this paper,we use the ligand as the blue emitter and the corresponding iridium complex as the yellow emitter to produce white color.reduce the cost of synthesis the energy transfer from ligand to complex is efficient the homog
6、eneity may be improved device efficiency and stability第八页，本课件共有19页实验实验Scheme 1.The ligands were labeled as LH,LCH3,LPh and LF,respectively,the complexes were labeled as IrH,IrCH3,IrPh and IrF,respectivelyCarbazolepara-bromated benzene derivatives2,5-dibromopyridine第九页，本课件共有19页For the ligands we expe
7、ct to get deep-blue emission and for the complexes we expect to red-shift the usually green-emitting phosphorescence.OLED器件结构第十页，本课件共有19页The devices were measured with a current/voltage source/measure unit(Keithley 2400)and a PR-650 luminance color meter.The color meter was placed on the bottom of t
8、he test device to mea ure the front luminance.玻璃基片分别放入盛有清洗液、去离子水、丙酮以及异丙酮的容器中进行超声清洗处理。接着,放在紫外臭氧室10分钟。high vacuum 10-4mbar第十一页，本课件共有19页结果讨论结果讨论yellow color electroluminescent devices were fabricated with the structure ITO/PEDOT:PSS(130 nm)/10%IrCH3 or IrPh in CBP(90 nm)/TPBI(45 nm)/LiF/Al.Fig.1.Curren
9、t efficiency vs.current density of the electrophosphorent yellow emitting device.Inset:spectra of IrCH3 under different driving voltages.current efficiency 20.6 cd/A,external efficiency 5.52%第十二页，本课件共有19页 parameterType Current efficiency External quantum efficiencyCIE coordinatesIrPh18.62 cd/A 5.14%
10、(0.45,0.54)IrH17.09 cd/A4.44%(0.41,0.57)IrF15.87 cd/A 4.21%(0.43,0.55)IrCH320.6 cd/A5.52%(0.43,0.56)第十三页，本课件共有19页Fig.2.Efficient energy transfer from ligand to Ir complex.(a)Phosphorescence intensity of IrPh with addition of differently concentrated LPh measured at 77 K(liquid N2).Inset of(a)from le
11、ft to right:photo of the blue emission of LPh,yellow emission of IrPh and white emission of the more concentrated LPh plus IrPh.The concentration of LPh and IrPh were adjusted through control of the absorption at 313 nm in CH2Cl2 at room temperature to be 0.175,0.378,0.624 and 0.469,respe-ctively.Th
12、en,take 1 ml IrPh and put it into a quartz tube,take another 1ml CH2Cl2,1 ml ligand of different concentrations and put them into the quartz tubes with IrPh in it and measure their emission intensities at the same machine run at 77 K(dilute L,conc.L and more conc.L means their absorption at 313 nm b
13、eing 0.175,0.368 and 0.624,respectively).第十四页，本课件共有19页(b)The excitation and emission of the ligands at room temperature.(c)The excitation and emission of the complexes at 77 K.It is evident that the emission of the ligand overlaps well with the excitation of the Ir complex第十五页，本课件共有19页Fig.3.(a)Norma
14、lized WOLED emission based on IrPh under different biases.Device structure:ITO/PEDOT:PSS/CBP:LPh:IrPh=180:10:1(molar ratio)/TPBI/LiF/Al.Inset:photo of the white lighting device;The phosphorescence emission is much stronger than the fluorescence emission.This is easy to be understood:in Ph-OLED,excit
15、ons in both singlet and triplet levels can be harvested and transformed into photons.In addition,the blue fluorescent emission increases faster with the increasing voltage than the yellow phosphorescent emission.This may be caused by the faster transporting of electrons towards the anode than th-at
16、of holes toward the cathode under higher electric field.第十六页，本课件共有19页(b)luminancecurrent densityvoltage curves;(c)current efficiency and power efficiency vs.current density curves.(0.31,0.39)第十七页，本课件共有19页小结小结目的：高效产生白光配体：主体、发射体、coordinator四种蓝色荧光配体和黄色磷光配合物大规模生产：提高效率、降低成本配体可收集转移能量给配合物第十八页，本课件共有19页第十九页，本课件共有19页