Negative Photochromic Material With Tunable Properties

Tech ID: 25901 / UC Case 2016-775-0

Brief Description

A class of materials with absorption spectras that are highly tunable in the visible and near infrared (NIR) wavelengths.

Background

Photoswitch molecules undergo a molecular change induced by light irradiation. Negative photochromes are photoswitches that reside in a conjugated colored form, and upon light irradiation change to a colorless form.  Common photoswitches absorb in the ultraviolet (UV) range and their versatility suffers from the limitations of UV light.  UV light penetrates surfaces poorly and the high energy UV light is damaging to many materials.  Highly tunable, simple to synthesize molecules that photoswitch following irradiation with visible light are very desirable for numerous applications.  

Description

UCSB researchers have developed a class of materials with absorption spectras that are highly tunable in the visible and near infrared (NIR) wavelengths.  Unlike many other photoswitches, these compounds are unresponsive to UV light which allows them to function as switches in systems where UV light is detrimental.  In addition, upon switching the material changes from colored to completely clear making them unambiguous tags.  These versatile photoswitches can be adapted to enable switching in liquid or solid materials to facilitate numerous applications, which are listed below.

Advantages

·            Tunable to a broad range of visible and NIR wavelengths

·            Simple to synthesize using commercially available chemicals

·            Completely clear when switched

·            The temperature dependence of thermal reversion is modifiable

·            Adaptable to liquid or solid phase

Applications

·            Pigment

·            Cosmetics

·            Photo-responsive phase-tag systems

·            Photo-responsive drug delivery

·            Sensors

 

Patent Status

Country Type Number Dated Case
United States Of America Published Application 19/0127345 05/02/2019 2016-775
 

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Keywords

photoswitches, UV, NIR, indadvmat, indansens

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