Abstract
The near infrared (NIR) electrochromism of lutetium phthalocyanine (LuPc 2) is studied both in its solution and vacuum deposited thin film. The LuPc 2 in neutral state has near infrared absorption in the region from 1100 nm to 1600 nm. In electrochemical oxidized state (+1.0 V), it has an absorption peak at 880 nm. In electrochemical reduced state (−1.0 V), it shows no absorption in the near IR region. The attenuation at 1300 nm of electrochromic (EC) devices based on solution and thin film of LuPC 2 was also studied. Attenuation of 0.31 dB and 0.28 dB was achieved respectively and the response time was 24 s and 1 s, respectively. These results demonstrate that LuPc 2 is a kind of NIR EC material and it has potential application for variable optical attenuator.
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