氯化钠作为阴极缓冲层的有机电致发光器件

发布时间：2018-04-24 00:10

本文选题：有机电致发光器件 + NaCl　；参考：《中国科学:物理学力学天文学》2017年12期

【摘要】：有机发光二极管(Organic Light-Emitting Diodes,OLED)具有驱动电压低、亮度和电流效率高、响应时间快、易实现大面积柔性等突出优点,在显示和照明等领域有广阔的应用前景.但是,由于这种二极管价格高昂,严重影响了其市场化的步伐.本研究使用价格便宜的氯化钠(NaCl)薄膜作为OLED器件的阴极缓冲层,以ITO玻璃为衬底,制作了结构为ITO/NPB(60?nm)/Alq3(50?nm)/NaCl(xnm)/Al(100?nm)的器件,其中x=0,1.5,2.0,2.5,3.0,3.5?nm.通过分析器件亮度-电压-电流特性,详细研究了NaCl薄膜厚度变化对OLED性能的影响.在器件阴极和Alq3之间加入一层NaCl薄膜后,J-V特性曲线明显向左移动,器件的开启电压明显下降.并且,随着NaCl薄膜的厚度逐渐增加,在0 2.0?nm范围,器件的开启电压随着厚度的增加而明显降低.当NaCl薄膜的厚度为2.0?nm时,器件的开启电压最低.NaCl薄膜的厚度超过2.5?nm时,随着NaCl薄膜厚度的增加,器件的开启电压也缓慢增加.但是,即使NaCl薄膜的厚度增加到3.5?nm,器件的开启电压还是远低于没有插入NaCl薄膜器件的开启电压.当插入NaCl薄膜的厚度小于2.5?nm时,器件的电流效率远大于没有NaCl薄膜的器件.同时,结合载流子隧穿方程,深入分析了相关的物理机制.本研究为降低OLED生产成本开辟了一条新的途径.
[Abstract]:Organic Light-Emitting diode (Ole) has many advantages, such as low driving voltage, high luminance and current efficiency, fast response time, easy to realize large area flexibility and so on. However, because this kind of diode price is high, seriously affected its market-oriented step. In this study, the inexpensive sodium chloride (NaCl) thin film was used as the cathode buffer layer of OLED devices, and the ITO glass substrate was used as the substrate. By analyzing the luminance, voltage and current characteristics of the device, the influence of the thickness of NaCl film on the performance of OLED is studied in detail. After adding a layer of NaCl film between the cathode of the device and the Alq3, the J-V characteristic curve of the device moves to the left obviously, and the starting voltage of the device decreases obviously. In addition, with the thickness of NaCl film increasing, the opening voltage of the device decreases obviously with the increase of the thickness of the device in the range of 0 2.0?nm. When the thickness of NaCl film is 2.0?nm, the minimum opening voltage of NaCl film is higher than that of 2.5?nm film. With the increase of NaCl film thickness, the opening voltage of the device increases slowly. However, even if the thickness of NaCl film is increased to 3.5 nm, the threshold voltage of the device is much lower than that of the device without NaCl film insertion. When the thickness of NaCl film is less than that of 2.5?nm, the current efficiency of the device is much higher than that of the device without NaCl film. At the same time, combined with the carrier tunneling equation, the related physical mechanism is analyzed in depth. This study opens up a new way to reduce the production cost of OLED.
【作者单位】：重庆师范大学物理与电子工程学院重庆市光电功能材料重点实验室重庆市高校光学工程重点实验室;
【基金】：国家自然科学基金(编号:60806047) 重庆市基础科学与前沿技术研究专项(编号:CSTC2017jcyjAX0333,CSTC2015jcyjA70001,CSTC2015jcyjBX0032) 重庆市教委科学技术研究项目(编号:KJ1600327) 重庆高校创新团队建设计划(编号:201013)资助项目
【分类号】：TN383.1

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