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Synthesis Of New Small Organic Charge Transport Compounds And Characterization Of Their Electrochemical Properties

Posted on:2007-08-02Degree:MasterType:Thesis
Country:ChinaCandidate:C X TanFull Text:PDF
GTID:2121360185451815Subject:Physical chemistry
Abstract/Summary:PDF Full Text Request
Organic electroluminescent devices (OELD) have such advantages as low-voltage driving,high luminosity,high efficiency and large-area color display which can be realized. Investigations of charge transport materials are drawing more and more attentions as the eletroluminescence technique develops. However, Most research were taken on engineering design of organic electroluminescent devices and organic charge transport materials were short of enough attentionCharge injection and transport are the limiting factors in determining operating voltage and luminance efficiency.The efficiency of an OLED is determined by charge balance,radiative decay of metal-organic interactions.In OLEDs, both operating voltage and luminance efficiency of the devices strongly medium and charge transport in the organic materials.In general,to achieve the lowest possible voltage it is necessary to have Ohmic interfaces between the organic layers and the charge-injecting contacts and to maximize the drift mobilith of both types of carriers.In this paper,we synthesized 3-(4'-pyridyl) /phenyl-6-aryl-1,2,4-triazolo[3,4-b]-1,3,4-thiadiazoles,2,6-bis (6-aryl-[1,2,4]triazolo[3,4-b]-1,3,4-thiadiazolo-3-yl) pyridines and thiocarbonohydrazones.The structures of these compounds were confirmed by IR,~1HNMR,MS or element synthesis.Cyclic voltammetry was employed to determine the HOMO(or LUMO)energy lever of the synthesized compounds, then we calculated LUMO(or HOMO) energy lever based on the UV-spectra of these compounds,which determine the energy gap of molecules,and compared with the HOMO,LUMO of PBD, PVK to study their electrochemical properties. Result showed 3-(4'-pyridyl) /phenyl-6 -aryl-1,2,4-triazolo[3,4-b]-1,3,4-thiadiazoles and thiocarbonohydrazones have higher electron affmith,it implied they mey be better electron transport materials,however, thiocarbonohydrazones have low melt point which would limit its application.2,6-bis (6-aryl-[1,2,4] triazolo[3,4-b] -1,3,4-thiadiazolo-3-yl) pyridine have large conjugated plane, higher ionization energy and high melt point ,which implied they perhaps will be good hole tansport materials.Study shows that most organic charge transport materials are aromatic compound which have large conjugated plane. They have enough capacity to accept electron or hole and can transfer electron or hole efficiency under positive voltage. We can select good organica molecules used as organic charge transport materials.
Keywords/Search Tags:charge transport materials, cyclic voltammogram, energy band parameter
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