Thickness modulation is an important way to improve the performance of organic light-emitting diode(OLED)device.In this paper,flexible green OLED devices were constructed by vacuum thermal evaporation,using graphene as the transparent anode and 1,1-bis[4-[N,N-bis(p-tolyl)amino]phe-nyl]cyclohexane(TAPC)as the hole transport layer.The effects of evaporation speed on the morphology of the TAPC layer and the thickness of TAPC layer on the device performance were studied.First,60 nm-thick TAPC layers were fabricated by controlling the evaporation speed at 0.05,0.1 and 0.15 nm·s-1.It was found that the TAPC film had the lowest surface roughness of～2.52 nm when the evaporation speed was 0.05 nm·s-1.Subsequently,TAPC layers with thicknesses of 50,60,70 and 80 nm were fabricated at a evaporation speed of 0.05 nm·s-1 and OLED devices were fabricated while keeping the thickness of oth-er functional layers unchanged.A comparative study showed that the device with 70 nm-thick TAPC layer achieved the highest performance with a maximum brightness of 34350 cd·m-2 and a maximum external quantum efficiency(EQE)of 21.02％.Meanwhile,the device has excellent flexibility and the CIE chroma-ticity coordinate is located at(0.3140,0.6386),which is very close to the chromaticity coordinate of stan-dard green light.This study is significant for promoting the application of flexible graphene-based OLEDs in the fields of display and lighting and for the development of wearable optoelectronic devices.
关键词
无机非金属材料/有机发光二极管、空穴传输层、石墨烯、柔性光电子
Key words
inorganic non-metallic materials/organic light-emitting diodes/hole transport layers/gra-phene/flexible optoelectronics
维普
万方数据