Kanosue Kenta, Ando Shinji
Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Ookayama 2-12-1-E4-5, Meguro-ku, Tokyo 152-8552, Japan.
ACS Macro Lett. 2016 Dec 20;5(12):1301-1305. doi: 10.1021/acsmacrolett.6b00642. Epub 2016 Nov 7.
Semiaromatic polyimides (PIs) and imide compounds containing heavy halogens (Br, I) in pyromellitic moieties were designed and synthesized to examine their photoluminescence properties. Solutions of imides and PI films exhibited reddish-color room-temperature phosphorescence (RTP) with very large Stokes shifts (ca. 10000 cm). In addition, the PI films showed small-Stokes-shifted fluorescence emissions at around 540 nm with absorption bands arising from aggregated PI chains at 400-500 nm. Enhanced phosphorescence observed for the PI films under vacuum indicates that the RTP lifetime is significantly influenced by the triplet-triplet energy transfer to atmospheric oxygen. These PIs with very-large-Stokes-shifted RTP are applicable as spectral conversion materials in displays, photovoltaic devices, and crop cultivators, as well as to oxygen/air sensors.
设计并合成了半芳香族聚酰亚胺（PI）以及在均苯四酸部分含有重卤素（Br、I）的酰亚胺化合物，以研究它们的光致发光特性。酰亚胺溶液和PI薄膜在室温下呈现出带红色的磷光（RTP），具有非常大的斯托克斯位移（约10000 cm）。此外，PI薄膜在540 nm左右显示出小斯托克斯位移的荧光发射，其吸收带源于400 - 500 nm处聚集的PI链。在真空中观察到PI薄膜的磷光增强，这表明RTP寿命受到三重态 - 三重态能量转移到大气氧的显著影响。这些具有非常大斯托克斯位移RTP的PI可作为光谱转换材料应用于显示器、光伏器件和作物栽培器，以及氧气/空气传感器。
