Novel Read/Write/Erase Materials for 2-Photon 3-D Optical Storage Memory Devices

摘要

We report here on the synthesis and spectroscopic properties of 2- indolyfulgides, which are N-substituted analogues of 2-indolyfulgides. These materials possess most of the properties of their 2-indolyfulgide precursors, but have better chemical stability and also open the way to further structure modification, which allow the adjustment of their spectroscopic properties. To our knowledge, the 2-indolylfulgides and 2-indolylfulgimides that we have synthesized are the best photochromic fluorescent materials ever reported. We have demonstrated write/read/erase media, for the first time ever, yet erasing also takes place when the information is accessed and read. This is due to the fact that the read excited state overlaps a write excited electronic state. We have therefore, the task, never accomplished or even considered previously, of inserting a new absorption band, that will be used and result only in erasing, while the written form does not erase, but only induce an intense fluorescence. Based on our experience and accumulated data, we expect the first-ever re- writable material processing these properties.