Polyimides with Heavy Halogens Exhibiting Room-Temperature Phosphorescence with Very Large Stokes Shifts
Polyimides with Heavy Halogens Exhibiting Room-Temperature Phosphorescence with Very Large Stokes Shifts
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DOI：
10.1021/acsmacrolett.6b00642
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发表时间：
2016-12-01
影响因子：
7.015
通讯作者：
Ando, Shinji
中科院分区：
文献类型：
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作者：
Kanosue, Kenta;Ando, Shinji
设计并合成了均苯四甲酸部分含有重卤素的半芳香族聚酰亚胺(PI)和含重卤素(BrI)的酰亚胺化合物，研究了它们的光致发光性能。酰亚胺和聚酰亚胺薄膜的溶液表现出略带红色的室温磷光，斯托克斯位移很大(约10000 cm(-1))。此外，PI薄膜在540 nm附近表现出小的斯托克斯位移的荧光发射，聚集态PI链在400-500 nm处有吸收带。真空下对PI薄膜的增强磷光观察表明，三重态、三重态能量转移到大气氧中对薄膜的RTP寿命有显著影响。这些具有超大斯托克斯位移RTP的PI可用作显示器、光伏设备和作物耕作机以及氧气/空气传感器的光谱转换材料。
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(-1)). 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.