Polyphosphazenes with Immobilized Dyes as Potential Color Filter Materials

Abstract

Red, green, and blue dye molecules were linked covalently to polyphosphazenes to generate soluble, film-forming materials appropriate for the formation of patterned tricolor filters for possible use in liquid crystalline and other display devices or in camera sensors. The monofunctional dyes (a red 1-[(E)-(4-nitrophenyl)diazenyl]-2-naphthol, a green tetraphenylporphyrin [5-(4-hydroxyphenyl)-10,15,20-tetraphenylporphyrin], and a toluidine blue dye) were employed as representative chromophores. The cosubstituents employed included 2,2,2-trifluoroethoxy with and without aryloxy groups or cyclopentanoxy groups. The optical densities were varied by adopting several dye-to-cosubstituent side group ratios. These dyes are models for a wide range of different chromophores that can be linked to polyphosphazene chains.

Polyphosphazenes: Phosphorus in Inorganic–Organic Polymers

“…Other examples include injectable supramolecular hydrogels 60 and ultraviolet cleavable micelles. 61 For nonbiological applications, transition metal complexes, 62,63 organic dyes, 24 and many sterically hindered species such as polyaromatic hydrocarbons, photonic groups, 64 carbon nanotubes, 65 and other electronically active units have been incorporated as minor side groups linked to a carrier polymer. Other examples include host−guest inclusion units, 66 cyclodextrins, 60 micelles, 61 crown ethers, 67 and a range of other bulky functional molecules that have some specialized function.…”

Stimuli‐Responsive Phosphorus‐Based Polymers

“…The optical transparency of the polyphosphazene main‐chain lies between the near‐infrared to below 220 nm and in comparison to many organic polymers, shows no propensity towards photochemical damage, assuming the organic substituents are carefully chosen. This relative stability to light and high transparency underlies their use as optical materials or indeed as photopolymers , .…”

“…This relative stability to light and high transparency underlies their use as optical materials or indeed as photopolymers , . Meanwhile, the ease of functionalization of the polyphosphazene backbone allows it to be readily loaded with chromophores, for example Allcock and co‐workers reported the preparation film‐forming polyphosphazenes with a mixture of red, green, and blue dye molecules . The dye loading and the properties of the polymers could be varied to provide patterned tricolor filters for the development of stable, printable color filters for liquid crystal displays.…”

Polyphosphazenes and Cyclotriphosphazenes with Propeller-like Tetraphenylethyleneoxy Side Groups: Tuning Mechanical and Optoelectronic Properties

“…A number of these polymers developed during recent decades provide property combinations that are difficult or impossible to find in classical all-organic counterparts. In particular, the development of elastomeric properties, − optoelectronic characteristics, − or bioerodible behavior − is well-developed. Furthermore, the unique torsional properties of the phosphorus–nitrogen bond endow some polyphosphazenes with very low glass transition temperatures ( T g ) compared to typical organic polymers.…”