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Research On The Plasmon Resonance Of The Sliver Nanocubes Enhanced Blue Organic Light Emitting Diodes

Posted on:2019-03-23Degree:MasterType:Thesis
Country:ChinaCandidate:Z J ZhouFull Text:PDF
GTID:2428330566495976Subject:Optical Engineering
Abstract/Summary:PDF Full Text Request
Organic light-emitting diodes?OLEDs?have great potential applications in flat panel displays and solid state lighting due to their many advantages,such as high brightness,fast response,low energy consumption,soft color,light weight and flexibility.So it is one of the hot topics in the field of photoelectric information technology in 21st century.In order to realize full color display or white light,efficient red,greed,and blue emission are necessary.However,the efficiency and stability of blue OLEDs are always lower than those of red and green OLEDs.Therefore,research for improving performances of blue OLED is essential and meaningful.Surface plasmon resonance?SPR?of metal nanostructures is widely considered as an effective way to improve the performance of OLED devices.In this paper,we mainly studied the effect of the SPR of sliver nanocubes on the performance of blue OLEDs,and prepared efficient blue OLED devices based on silver nanocubes.Firstly,the silver nanocubes were prepared by polyol method and coated with silica to form core-shell structure?Ag@SiO2 NC?.Transmission electron microscopy?TEM?showed that the size of silver nanocubes was about 40 nm,and the thickness of silica coating was about 8 nm.Through ultraviolet visible absorption,it is found that the plasmon resonance absorption peak of Ag@SiO2NC is located at about 430 nm.The absorption test of Ag@SiO2 NCs spun on the hole transmission layer PEDOT:PSS showed that Ag@SiO2 NC could effectively enhance the absorption intensity within the range of 400-550 nm and match the luminescent band of the blue emitting material FIrpic.Therefore,Ag@SiO2 NC can be introduced into blue OLED devices to improve the performance of blue light.Then the silver nanocubes?Ag@SiO2 NCs?was applied behind the hole transmission layer PEDOT:PSS of the blue OLED.The optimized efficient blue OLED device was prepared,and the current efficiency reached to 51.1cd/A,which shows a significant increase compared with the control device?40.2 cd/A?and the enhancement ratio is up to 27%.The mechanism of the surface plasmon resonance effect of the Ag@SiO2 NCs on the device performance was studied and analyzed.It showed that the surface plasmon resonance of the Ag@SiO2 NCs accelerated the spontaneous emission rate of the blue light excitons,and enhanced the intensity of the blue radiation,which is the main reason for the performance improvement of the device.At the same time,the coating layer of silica inhibited the trap effect of silver,working as another important factor for achieving high efficiency blue OLED.Finally,in order to study the effect of Ag@SiO2 NCs on the current of the blue OLED device,we prepared two kinds of blue OLED devices with different hole injection barriers,respectively,which is the blue OLED with single emitting layer based on mCP:FIrpic and the blue OLED with double emitting layers of TCTA:FIrpic and mCP:FIrpic.The results showed that the plasma resonance electric field of Ag@SiO2 NCs could enhance the injection efficiency of holes,and the effect was more significant in the single emitting layer devices with higher hole injection barrier.The study helps to explore the new working mechanism of metal nanoparticles in OLED devices.
Keywords/Search Tags:Blue organic light-emitting diode, Surface plasmon resonance, Silver nanocubes, High efficiency
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