Zachariadis Alexandros, Chatzidis Michalis, Tselekidou Despoina, Wurzinger Olaf, Keiper Dietmar, Baumann Peter K, Heuken Michael, Papadopoulos Kyparisis, Laskarakis Argiris, Logothetidis Stergios, Gioti Maria
Nanotechnology Lab LTFN, Department of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
AIXTRON SE, 2 Dornkaulstr, Herzogenrath, 52134 Aachen, Germany.
Micromachines (Basel). 2024 Aug 28;15(9):1089. doi: 10.3390/mi15091089.
Organometallic complexes containing reactive alkali metals, such as lithium (Li), represent a promising material approach for electron injection layers and electron transport layers (EILs and ETLs) to enhance the performance of Organic Light-Emitting Diodes (OLEDs). 8-Quinolinolato Lithium (Liq) has shown remarkable potential as an EIL and ETL when conveyed in very thin films. Nevertheless, the deposition of nano-layers requires precise control over both thickness and morphology. In this work, we investigate the optical properties and morphological characteristics of Liq thin films deposited via Organic Vapor Phase Deposition (OVPD). Specifically, we present our methodology for analyzing the measured pseudodielectric function <ε(ω)> using Spectroscopic Ellipsometry (SE), alongside the nano-topography of evaporated Liq nano-layers using Atomic Force Microscopy (AFM). This information can contribute to the understanding of the functionality of this material, since ultra-thin Liq interlayers can significantly increase the operational stability of OLED architectures.
含有活性碱金属（如锂（Li））的有机金属配合物，是一种用于电子注入层和电子传输层（EILs和ETLs）以提高有机发光二极管（OLEDs）性能的很有前景的材料方法。当以非常薄的薄膜形式传输时，8-羟基喹啉锂（Liq）作为电子注入层和电子传输层已显示出显著的潜力。然而，纳米层的沉积需要对厚度和形态进行精确控制。在这项工作中，我们研究了通过有机气相沉积（OVPD）法沉积的Liq薄膜的光学性质和形态特征。具体而言，我们展示了使用光谱椭偏仪（SE）分析测量的伪介电函数<ε(ω)>的方法，以及使用原子力显微镜（AFM）分析蒸发的Liq纳米层的纳米形貌的方法。这些信息有助于理解这种材料的功能，因为超薄的Liq中间层可以显著提高OLED结构的运行稳定性。
