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Optical recording materials utilizing the change in molecular arrangement

利用分子排列变化的光记录材料

基本信息

批准号：
09640685
负责人：
MIZUGUCHI Jin
金额：
$ 1.66万
依托单位：
Yokohama National University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640685/
关键词：
Organic pigment Electronic spectra Crystal structure Phase change X-ray diffraction Optical recording IR spectra Raman spectra X線回析

项目摘要

The target of the optical recording system with high density is now focused on systems based on a GaInPAl laser diode of 635 nm. This system achieves 1.5 times higher recording density in comparison with the present system of 780 nm and is therefore expected as an ideal system for DVD.The purpose of our investigation is to explore or synthesize functional dyestuffs that can switch the absorption band around 635 nm. In the present investigation, perylene pigments as well as non-benzenoid compounds such as 8,8-dicyanoheptafulvenes have been investigated. Among perylene pigments, we found a black perylene which exhibits a vivid red color in an amorphous state but turns black (appearance of the absorption band around 635 nm) when crystallized. The electronic structure has therefore been characterized extensively on the basis of the crystal structure, polarized reflection spectra as well as MO calculations. In parallel, we have tested a number of optical disks based on the black perylene and confirmed good recording characteristics. As for 8,8-dicyanoheptafulvene derivatives, we have newly prepared a variety of derivatives, one of which showed an optical switching around 635 nm on going from an amorphous state to the crystallized state. This compound has also attracted attention for optical recording systems, but we soon found that the amorphous phase crystallizes rapidly in the ambient atmosphere. For this reason, we were obliged to abandon the application of this material for optical disks. However, unexpectedly, the present compound was found to exhibit non-linear optical characteristics, and a patent for this application has been claimed.

高密度光学记录系统的目标现在集中在基于635 nm GaInPAl激光二极管的系统上。该系统的记录密度比现有的780纳米系统高1.5倍，因此有望成为DVD的理想系统。我们研究的目的是探索或合成能在635 nm左右转换吸收带的功能性染料。在本研究中，苝颜料以及非苯类化合物如8,8-二氰七氟烯已被研究。在苝颜料中，我们发现了一种黑色苝，它在无定形状态下呈现鲜艳的红色，但在结晶时变成黑色（在635 nm左右的吸收带外观）。因此，在晶体结构、偏振反射光谱以及MO计算的基础上，对电子结构进行了广泛的表征。同时，我们测试了一些基于黑苝的光盘，并证实了良好的记录特性。对于8,8-二氰七氟烯衍生物，我们新制备了多种衍生物，其中一种衍生物在从无定形到结晶态的过程中出现了635 nm左右的光开关。这种化合物也引起了光学记录系统的注意，但我们很快发现，非晶相在环境气氛中迅速结晶。因此，我们不得不放弃将这种材料用于光盘。然而，出乎意料的是，本化合物被发现表现出非线性光学特性，并为该应用申请了专利。