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

doi:10.11901/1005.3093.2023.198

材料研究学报

2024, Vol. 38

Issue (3): 168-176 DOI: 10.11901/1005.3093.2023.198

研究论文

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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

刘锐¹^,², 张鼎冬², 张辉¹(

), 任文才², 杜金红²(

)

^1.沈阳化工大学材料科学与工程学院沈阳 110142
^2.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

Effects of the Thickness of the Hole Transport Layer on the Performance of Graphene-based Organic Light-emitting Diodes

LIU Rui¹^,², ZHANG Dingdong², ZHANG Hui¹(

), REN Wencai², DU Jinhong²(

)

^1.School of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
^2.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

刘锐, 张鼎冬, 张辉, 任文才, 杜金红. 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[J]. 材料研究学报, 2024, 38(3): 168-176.
Rui LIU, Dingdong ZHANG, Hui ZHANG, Wencai REN, Jinhong DU. Effects of the Thickness of the Hole Transport Layer on the Performance of Graphene-based Organic Light-emitting Diodes[J]. Chinese Journal of Materials Research, 2024, 38(3): 168-176.

全文: PDF(6934 KB) HTML

摘要:

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80 nm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。

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

Abstract：

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]phenyl]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 other 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 chromaticity coordinate is located at (0.3140, 0.6386), which is very close to the chromaticity coordinate of standard 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.

Key words： inorganic non-metallic materials organic light-emitting diodes hole transport layers graphene flexible optoelectronics

收稿日期: 2023-03-23

ZTFLH:

TN383.1

基金资助:国家自然科学基金(52002375);国家自然科学基金(52272051);中国博士后科学基金会(2020M670812);中国博士后科学基金会(2020TQ0328);辽宁省科技厅博士启动基金(2021-BS-003)

通讯作者: 张辉，副教授，krista9150@sina.com，研究方向为碳纳米复合材料的制备及应用;
杜金红，研究员，jhdu@imr.ac.cn，研究方向为石墨烯等二维材料光电器件应用

Corresponding author: ZHANG Hui, Tel:13998243835, E-mail: krista9150@sina.com;DU Jinhong, Tel:(024)83970720, E-mail: jhdu@imr.ac.cn

作者简介: 刘锐，男，1997年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2023.198 或 https://www.cjmr.org/CN/Y2024/V38/I3/168

图1 OLED器件制备使用的有机材料

图2 G-OLED器件的结构和能级图

图3 不同蒸镀速率制备的60 nm厚TAPC层的表面形貌

图4 OLED器件的J-V曲线、L-V曲线、CE-L曲线、PE-L曲线、EQE-L性能、电致发光的光谱图、CE最大值、PE最大值和EQE最大值

表1 G-OLED器件的性能

图5 不同TAPC厚度的OLED器件的形貌

图6 柔性绿光G-OLED器件的性能

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