Research On Performance Of OLED Devices Based On Micro-nano Structures And SAM Modified Electrodes

Organic light-emitting diode(OLED)is considered to be the mainstream of display and lighting technology in the future with a series of advantages,such as low energy consumption,glareless ray,simple structure and flexibility.However,there are still problems faced with process complexity,low service life,and high cost.This paper is mainly aimed at improving the performance of OLED devices with the application of micro-nano structures and SAM modified electrodes.Specific research contents are as follows:We research the PMMA/PS film formation in different concentration ratio of PMMA and PS,respectively using THF and toluene as the solvent.It is found that when the concentration ratio of PMMA:PS is 3:7 in toluene,the most uniform and densest columnar structure can be obtained.The OLED device is fabricated.The test results show that using the free nano columnar structures,the devices' spectrum is wider,and the maximum brightness of the devices is improved.The surface morphology of thin films annealing under different temperatures are tested,and it's found that the exorbitant annealing temperature will make the adjacent micro-nano structure gather,seriously reducing the uniformity and consistency of the films' surface structures.We also research the surface properties of ITO modified with bromoacetic acid and 2,4-Dichlorophenoxyacetic acid respectively,which can form self-assembled monolayer on ITO surface.The results showe that 2,4-Dichlorophenoxyacetic acid modified ITO can improve the contact performance of ITO and the subsequent film,which is beneficial for film coating.On the other hand,it reduces the barrier between the ITO and organic layer effectively,which can improve the carrier injection ability.The OLED devices are fabricated,and the OLED devices' structure is as follows: ITO/PVK(2000 r/min)/FIrPic:SimCP(2000 r/min)/TPBi(30 nm)/Li F(1 nm)/Al(150nm).It is found that the maximum brightness of the device can be increased to 1875.2 cd/m2 by using the ITO modified with 2,4-Dichlorophenoxyacetic acid as the anode,and meanwhile the turn-on voltage is reduced from 6.2 V to 5.3 V,which indicate that the device performance is improved.In this paper,empolying micro-nano structures and SAM modified electrodes,we improve the brightness and current efficiency of the device.In the following experiments,we can extend the life of the device by inhibiting the penetration of the harmful ions to the organic layer and reducing the accumulation of carriers in the organic layer.