首页|空穴传输层的厚度对石墨烯基有机发光二极管性能的影响

空穴传输层的厚度对石墨烯基有机发光二极管性能的影响

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以石墨烯作为透明阳极、以1,1-双[4-[N,N-二(对甲苯基)氨基]苯基]环己烷(TAPC)作为空穴传输层,用蒸镀法构建柔性绿光OLED器件,研究了蒸镀速率对TAPC层形貌的影响和TAPC层的厚度对器件性能的影响.先控制蒸镀速率分别为0.05、0.1和0.15 nm·s-1制备了厚度为60 nm的TAPC膜层,蒸镀速率为0.05 nm·s-1的TAPC膜层其表面粗糙度(2.52 nm)最低.随后在保持其他材料层厚度不变的情况下,以0.05 nm·s-1的蒸镀速率分别制备了厚度为50、60、70和80nm的TAPC膜层并构建了 OLED器件.对比研究发现,TAPC层厚度为70 nm的器件性能最佳,其最大亮度达到34350 cd·m-2,最高外量子效率(EQE)达到21.02％.该器件还具有优异的柔韧性,是色坐标位于(0.3140,0.6386)的标准绿光OLED器件.
Effects of the Thickness of the Hole Transport Layer on the Performance of Graphene-based Organic Light-emitting Diodes
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.

inorganic non-metallic materialsorganic light-emitting diodeshole transport layersgra-pheneflexible optoelectronics

刘锐、张鼎冬、张辉、任文才、杜金红

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沈阳化工大学材料科学与工程学院 沈阳 110142

中国科学院金属研究所沈阳材料科学国家研究中心 沈阳 110016

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

国家自然科学基金国家自然科学基金中国博士后科学基金会中国博士后科学基金会辽宁省科技厅博士启动基金

52002375522720512020M6708122020TQ03282021-BS-003

2024

10.11901/1005.3093.2023.198

材料研究学报
国家自然科学基金委员会 中国材料研究学会

材料研究学报

CSTPCD北大核心
影响因子：0.605
ISSN：1005-3093
年,卷(期)：2024.38(3)
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