Current Developments in Optical Data Storage with Organic Dyes

Abstract

The main motivation for the development of digital data storage has been the improvement in play-back quality and the increase in storage capacity. In 1982 Philips and Sony introduced the first technically and economically successful system based on this-the compact disc (CD) and a compatible player. A very broad diversity of optical data recording formats are available today, and a difference is drawn between prerecorded, recordable, and rewritable media. This Review gives an overview of the systems used, the main features of production, and then concentrates on the properties of the organic dyes that are used in recordable systems. Dyestuffs chemistry has gained the reputation of having become a mature field of activity. Is this prejudice or a justified swan song for dyestuffs chemistry? When applications in optical data storage are considered, it is evident that even today progresses such as CD-R and DVD/R would not be feasible without functional dyes.

Fluorescent Streptocyanine Dyes: Synthesis and Photophysical Properties – Synthesis of a New Hemicarboxonium Salt

“…When the nitrogen atoms are included in conjugated heterocycles, the dye is called a cyanine, otherwise it is a streptocyanine. Numerous applications are already known for dyes of this type: [1] photographic sensitizers [2] , optical recording devices [3] , nonlinear frequency doublers [4] , drugs [5] , and biological probes [6] mainly by using their fluorescence properties. It is of primary interest to synthesize dyes emitting fluorescence above 600 nm in order to avoid the interference of fluorescence of complex media such as biological ones.…”

Introduction

“…2.1.1. 11 ) when there is no need to specify substituents. Normally, Pc ligands are dianions (i.e., Pc(2-)) in their metal complexes; hence, the oxidation state is not shown unless otherwise noted (e.g., Pc(3-) and Pc(-) stand for one-electron-reduced and oxidized species, respectively).…”

A DFT Study on the Nucleophilic Substitution of NO2-Group in 2-Nitrophthalocyanines

“…Due to their high chemical and thermal stability as well as intensive absorption in the visible (ε~10 5 M -1 cm -1 ) and near IR regions, [2][3][4] phthalocyanines are applied as new perspective materials, mainly, in molecular electronic devices, [1] as optical recording materials, [5] catalysts for conversion of pollutants to useful products, [6][7][8] sensitizers for PDT [9,10] and antiviral chemicals. [11,12] A considerable interest of scientists is directed to the asymmetrically substituted monophthalocyanines of A 3 Btype bearing one peripheral functional substituent or fragment.…”