Dichroic Dyes for Liquid Crystal Applications
Dichroic dyes have a range of applications, including guest-host liquid crystal displays for electronic display devices and more recently in PDLC (polymer dispersed liquid crystals), for applications such as Smart Glass.
Working with dichroic dyes in electronic displays means working to very high specifications (e.g. 99.0-99.9% organic purity) and our existing customers are continually impressed with the high purity and overall quality of the products we supply. Having worked on a number of contract research projects involving dichroic dyes, our team of chemists has developed the skills required to carry out difficult synthetic procedures and produce samples of the highest quality.
We can supply a set of standard dichroic dyes including dichroic azo-dyes and dichroic anthraquinone dyes, to achieve specific colour sets or a black mixture to add to your liquid crystal. We also supply research amounts of research dyes with different properties, for our custoemrs to test. This allows our customers to build a knowledge of which dyes work well in their application and allows us to design specific dyes to improve their performance.
We also supply other coloured chromophores known to show dichroism, such as perylenes, squaraines (squarylliums) and naphthoquinones, to name a few.
Using our expert dye knowledge we can modify the substituents around the central chromophore, to alter the λmax (the absorption maximum of the chromophore). Then by the addition of mesogenic groups we can improve the dichroic ratio and the dye solubility in a given medium, such as a liquid crystal matrix. This means that we can tailor the structure of any known dichroic dye compound to meet your requirements. We can even synthesise polymerisable dichroic dyes which can be sued to “fix” patterns in polymeric liquid crystals.
Our knowledge of dichroic dyes and chromophores in general, allows us to extend our range of dyes to offer UV absorbers at ~350nm to IR absorbers up to around 850nm absorbance. We can even offer more cost efficient dyes, where slightly lower quality (98-99% purity) will suffice in your application.
At CS Solutions Ltd, we’re able to use our understanding of liquid crystals to incorporate appropriate mesogenic groups to your dye to improve it’s dichroic ratio and overall performance. Alternatively, we’re able to take a mesogen and incorporate a chromophore which absorbs at a given wavelength to allow you to explore a range of properties within your liquid crystal medium.
We are now expanding our catalogue of dichroic dyes in order to offer single colours (yellow, orange, red, magenta, blue and cyan) in both Azo and Anthraquinone forms, plus we can offer a series of homogenous black dichroic dyes for testing in your application.
We are constantly striving to improve our dichroic dye range and improve upon their absorption, solubility, dichroic ratio and thermal/photostability. Give CS Solutions a call and see if we can help in your application.
Dichroic dyes available from CS Solutions
Here at CS Solutions we like to provide a tailored solution to give the best results in your applications. However, we realise that initially our customers often want an off-the-shelf dichroic dye to develop working prototypes and prove feasibility.
With this in mind, CS Solutions have begun developing an UV to coloured to IR absorbing dichroic dyes in a selection of chromophores. These chromophores include standard azo and anthraquinones, but also other more investigative structures that may suit your applications.
We can currently provide 100’s milligrams to gram samples of a selection of dyes of various colours, including yellow, red, magenta, blue and cyan. We also provide dichroic black mixtures, or other mixtures to provide you with the absorbance (or transmission) you require.
Contact us and let us know what your requirements are. We’re here to help!