Abstract
We propose a highly oriented photochromic dye film for an ultraviolet (UV)-sensing layer, where spirooxazine (SO) derivatives are aligned with the liquid crystalline UV-curable reactive mesogens (RM) using a guest-host effect. For effective electrical UV sensing with a simple metal-insulator-metal structure, our results show that the UV-induced switchable dipole moment amount of the SO derivatives is high; however, their tilting orientation should be controlled. Compared to the dielectric layer with the nearly planar SO dye orientation, the photochromic dielectric layer with the moderately tilted dye orientation shows more than seven times higher the UV-induced capacitance variation.
Highlights
Several types of ultraviolet (UV) sensors have been proposed to measure doses of UV irradiation with greater efficiency and easier methods
We propose a method of developing a UV sensor that can quantitatively and effectively measure an incident UV intensity with an electrical method through the simple MIM
By utilizing the guest-host effect in the mixed film, we demonstrate that the SO dyes as a guest material can be well-oriented by following the orientation of the liquid crystalline reactive mesogens (RM) molecules used for the host material
Summary
Several types of ultraviolet (UV) sensors have been proposed to measure doses of UV irradiation with greater efficiency and easier methods. UV sensors have been developed based on the principles of photoconductive effects using several kinds of wide-band-gap inorganic materials, such as GaN, AlN, SnO2 , and ZnO compounds [1,2,3,4,5]. The photochromic organic materials in a solution state can be made into a thin electro-optic film with a spin-coating or printing process. The optical transmittance variation or spectral change of the UV-irradiated photochromic film can be sensed, even with naked eyes [13]. The UV dose can be quantitatively measured by employing a pair of probing optical sources and an optical detector. This approach makes the optical system bulky [14]
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