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The Study on the All Solution Processed PLED

Author: XuYongYan
Tutor: LiangChunJun
School: Beijing Jiaotong University
Course: Condensed Matter Physics
Keywords: PFO Annealing All-wet PEDOT: PSS Dispensing MEH-PPv Cs2CO3 Spin coating
CLC: TN312.8
Type: Master's thesis
Year: 2011
Downloads: 73
Quote: 0
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Abstract


In the beginning OLED is recognized as a very promising display technology , whether it is a small molecule or polymer devices , have a very important research and application value . A conductive polymer , poly (3,4 - ethylenedioxythiophene thiophene ) / polystyrene sulfonic acid has been widely used in the preparation of the OLED device . This paper is introduced in the \The specific work of this paper is divided into the following three parts : one to do with Al cathode , the PFO film morphology by studying the the PFO annealing temperature and annealing time to improve the luminous intensity and efficiency of the PFO . Annealing temperature range from 70 degrees to 180 degrees , luminous intensity and efficiency of the PFO increased with increasing annealing temperature , observed the morphology of the PFO with a polarizing microscope and found that the morphology of the PFO certain regularity . And when the high temperature to 200 degrees , the device short-circuited . Second, in view of the doping of PEDOT : PSS aqueous solution of conductivity has been increased to above 1000S/cm , basically meet it as a the anode conductive polymer material can be used as the anode used in an OLED device , as an alternative to the Al electrode , while ITO as the cathode in this case . By drip coating method of PEDOT: PSS film was prepared in the device , while the other layer of the device is prepared through the completion of the spin coating method . The whole preparation process is not used evaporation method , the process is simple, and time is short , this is what I call \Also studied the PEDOT: PSS anode material prepared in the spin coating method of a more simple , but the effect is not good . Three Cs2C03 film inserted into the MEH-PPV OLED cathode or anode position , positive and negative voltage devices luminescence properties is also good , and the brightness and efficiency . Reverse voltage , the brightness of the device and current with the timetable exhibit characteristics of the LEC's . We believe that the added Cs2C03 of MEH-PPV light emitting device , the device becomes the LEC devices , Cs2CO3 here acts as an electrolyte role . Under the action of the electric field becomes Cs and CO3-2 moves to the negative electrode and a positive electrode , thereby improving the carrier injection device . This is a new interpretation of the role we play Cs2CO3 in OLED devices .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Semiconductor technology > Semiconductor diode > Diodes: structure and performance > Light-emitting diodes
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