Ono Sotaro, Usui Satoshi, Kim Seong-Ho, Tanaka Kuniaki, Advincula Rigoberto C, Usuil Hiroaki
J Nanosci Nanotechnol. 2016 Apr;16(4):3407-13. doi: 10.1166/jnn.2016.12314.
Organic light-emitting diodes (OLEDs) were prepared on-indium-tin oxide (ITO) substrates that were modified with various self-assembled monolayers (SAMs) including those which have reactive terminal units. The OLED performance was analyzed in terms of molecular length, dipole moment and HOMO level of SAM molecules estimated by the density functional theory calculation. It was suggested that the current efficiency of OLED is partly improved by controlling the carrier balance, interfacial dipole moment, and electron energy level by SAM modification. More importantly, remarkable improvement in OLED efficiency was achieved by chemically tethering the inorganic/organic interface via benzophenone-terminated SAM. The reactive SAM having benzophenone terminal group can be a promising tool to control the inorganic/organic interface for organic devices.
在经过各种自组装单分子层（SAMs）修饰的氧化铟锡（ITO）衬底上制备了有机发光二极管（OLEDs），这些自组装单分子层包括具有反应性末端单元的单分子层。根据通过密度泛函理论计算估算的SAM分子的分子长度、偶极矩和最高占据分子轨道（HOMO）能级，对OLED的性能进行了分析。结果表明，通过SAM修饰控制载流子平衡、界面偶极矩和电子能级，可部分提高OLED的电流效率。更重要的是，通过经由二苯甲酮封端的SAM对无机/有机界面进行化学连接，OLED效率得到了显著提高。具有二苯甲酮端基的反应性SAM可能成为控制有机器件无机/有机界面的一种有前途的工具。
