Multifrequency Photochromic Memory Materials (original) (raw)

Springer eBooks, 1990

Abstract

There is renewed interest in organic materials for optical data storage and, recently, a multifrequency memory, comprising a Langmuir-Blodgett film with different photochromic layers, was proposed by Ando et al.1–4. To store several bits per pixel requires layers, with non-overlapping photochromic bands, which may be independently switched. The J-aggregated spiropyrans show some promise4 but their frequency range is restricted. It is necessary to design alternative materials with photochromic bands in the visible and near IR. An interesting series of photochromics, with tunable absorption bands, has been studied at Cranfield5–7. The materials are zwitterionic8 and have the general formula D+-CH=C(CN)-C6H4-C(CN)2 − where D+ is a pyridinium or quinolinium group linked at the alpha or gamma position. They may be switched at visible wavelengths and the photochromism has been attributed5,6 to electron transfer between a coloured zwitterionic form and a neutral colourless form.

Marek Szablewski hasn't uploaded this paper.

Let Marek know you want this paper to be uploaded.

Ask for this paper to be uploaded.