权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Thermochromism of perylene pigments and their application to optical disks

苝颜料的热致变色及其在光盘上的应用

基本信息

批准号：
11640579
负责人：
MIZUGUCHI Jin
金额：
$ 2.24万
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：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

Thermochromic properties of perylene-black pigments have been characterized, with special attention to potential applications for optical disks, from the standpoint of molecular and crystal structures as well as intermolecular interactions. Thermochromism is found not to arise from changes in molecular structure but due to changes in intermolecular interactions under temperature variations. The perylene-black pigments investigated are characteristic of the typical systems, in which the interactions between transition dipoles prevail in the solid state due to large absorption coefficients of the constituent molecules. In this case, there appear two absorption bands in the visible region : one is attributed to individual molecules (473 nm) and the other is due to exciton coupling effects (635 nm). Since the latter band depends on the intermolecular interactions, the present band exhibits a remarkable temperature dependence. This is the mechanism of the thermochromism of the perylene black. In an extreme case, the color changes between red ("amorphous") and black ("crystalline"). This color change can be applied to optical disk systems based on an AlGaInP diode laser of 635 nm. An information storage system has been developed in which the absorption at 635 nm is switched on (red→black) or switched-off (black→red) on irradiation with laser in the presence of a hydrazone compound that induces a phase change.

从分子和晶体结构以及分子间相互作用的角度，表征了紫红色颜料的热致变色性能，特别关注了其在光盘方面的潜在应用。热致变色不是由分子结构的变化引起的，而是由于温度变化下分子间相互作用的变化引起的。由于组成分子的吸收系数较大，过渡偶极子之间的相互作用在固体中占优势，所研究的紫苏黑色颜料是典型体系的特征。在这种情况下，在可见光区出现了两个吸收带：一个是单个分子的吸收带(473 Nm)，另一个是激子耦合效应的吸收带(635 Nm)。由于后一带依赖于分子间相互作用，因此本带表现出显著的温度依赖性。这就是沸石黑的热致变色机理。在极端情况下，颜色在红色(“无定形”)和黑色(“水晶”)之间变化。这种颜色变化可以应用于基于635 nm的AlGaInP半导体激光器的光盘系统。已经开发了一种信息存储系统，在该信息存储系统中，在激光照射下，在635 nm处的吸收被开启(红色→黑)或关闭(黑→红)，其中存在诱导相变的肼化合物。