Kim Misuk, Kim Jiyoun, Kim Hyeonwoo, Jung Incheol, Kwak Hojae, Lee Gil Sun, Na Young Jun, Hong Young Ki, Park Dong Hyuk, Lee Kyu-Tae
Department of Physics, Inha University, Incheon 22212, Korea.
Department of Chemical Engineering, Program in Biomedical Science and Engineering, Inha University, Incheon 22212, Korea.
Polymers (Basel). 2022 Apr 30;14(9):1846. doi: 10.3390/polym14091846.
We experimentally demonstrate the direct visualization of ultraviolet (UV) light using flexible polymer composite films consisting of crystalline organic tris-(8-hydroxyquinoline) aluminum (Alq3) micro-rods and polydimethylsiloxane (PDMS). The representative organic mono-molecule Alq3, which is a core material of organic light-emitting diodes, was used to detect light in the invisible UV region and visualize photoluminescence (PL). Alq3 shows absorption in the UV region and light-emitting characteristics in the green region, making it an optimal material for UV visualization because of its large Stokes transition. Crystalline Alq3 micro-rods were fabricated in a deionized water solution through a sequential process of reprecipitation and self-assembly. Highly bright photoluminescence was observed on the highly crystalline Alq3 micro-rods under UV light excitation, indicating that the crystalline structures of Alq3 molecules affect the visible emission decay of excitons. The Alq3 micro-rods were manufactured as flexible polymer composite films using a PDMS solution to observe UV photodetector characteristics according to UV intensity, and it was confirmed that the intensity of the fine UV light reaching the earth's surface can be visualized by making use of this UV photodetector.
我们通过实验证明了使用由结晶有机三（8-羟基喹啉）铝（Alq3）微棒和聚二甲基硅氧烷（PDMS）组成的柔性聚合物复合膜直接可视化紫外（UV）光。具有代表性的有机单分子Alq3是有机发光二极管的核心材料，用于检测不可见紫外区域的光并可视化光致发光（PL）。Alq3在紫外区域有吸收，在绿色区域有发光特性，由于其大的斯托克斯跃迁，使其成为紫外可视化的理想材料。通过再沉淀和自组装的顺序过程在去离子水溶液中制备了结晶Alq3微棒。在紫外光激发下，在高度结晶的Alq3微棒上观察到高亮度的光致发光，表明Alq3分子的晶体结构影响激子的可见发射衰减。使用PDMS溶液将Alq3微棒制成柔性聚合物复合膜，以观察根据紫外强度的紫外光探测器特性，并且证实利用这种紫外光探测器可以可视化到达地球表面的精细紫外光的强度。
