Kim Seokho, Kim Do Hyoung, Choi Jinho, Lee Hojin, Kim Sun-Young, Park Jung Woon, Park Dong Hyuk
Department of Applied Organic Materials Engineering, Inha University, Incheon 22212, Korea.
Department of Chemical Engineering, Inha University, Incheon 22212, Korea.
Materials (Basel). 2018 Mar 22;11(4):472. doi: 10.3390/ma11040472.
We report the growth and nanoscale luminescence characteristics of 8-hydroxyquinolinato aluminum (Alq₃) with a crystalline hexagonal column morphology. Pristine Alq₃ nanoparticles (NPs) were prepared using a conventional reprecipitation method. Crystal hexagonal columns of Alq₃ were grown by using a surfactant-assisted self-assembly technique as an adjunct to the aforementioned reprecipitation method. The formation and structural properties of the crystalline and non-crystalline Alq₃ NPs were analyzed with scanning electron microscopy and X-ray diffraction. The nanoscale photoluminescence (PL) characteristics and the luminescence color of the Alq₃ single NPs and their crystal microwires (MWs) were evaluated from color charge-coupled device images acquired using a high-resolution laser confocal microscope. In comparison with the Alq₃ NPs, the crystalline MWs exhibited a very bright and sharp emission. This enhanced and sharp emission from the crystalline Alq₃ single MWs originated from effective π-π stacking of the Alq₃ molecules due to strong interactions in the crystalline structure.
我们报道了具有晶体六方柱状形态的8-羟基喹啉铝（Alq₃）的生长及纳米级发光特性。采用传统的再沉淀法制备了纯净的Alq₃纳米颗粒（NPs）。通过使用表面活性剂辅助自组装技术作为上述再沉淀法的辅助手段，生长出了Alq₃的晶体六方柱。利用扫描电子显微镜和X射线衍射分析了晶体和非晶体Alq₃ NPs的形成及结构性质。通过使用高分辨率激光共聚焦显微镜采集的彩色电荷耦合器件图像，评估了Alq₃单个NP及其晶体微线（MWs）的纳米级光致发光（PL）特性和发光颜色。与Alq₃ NPs相比，晶体MWs表现出非常明亮且尖锐的发射。晶体Alq₃单个MWs这种增强且尖锐的发射源于晶体结构中强相互作用导致的Alq₃分子有效的π-π堆积。
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