Photoisomerization in Photoaligned Azo Dyes Exhibiting Photostability

Abstract

Here in this investigation, the molecules exhibiting photoisomerization in solutions is also photostable is observed. On the other hand molecules not showing photoisomerization behavior in solutions is not shown such kind of stability. Surprising behavior in which after writing laser is turned off, there is going to be increase in phase retardation (or order parameter) which is under deep consideration. Detail investigation is in progress to reveal the behavior of chemical structures when light is shined on them. Proposed investigation is crucial for selecting suitable azo dyes for photoalignment studies and also for many commercial applications which depends on many factors like stability, order parameter etc.

Keywords:

• birefringence
• cis-trans
• photoisomerization
• stability

Acknowledgments

This work was supported by HKUST grant CERG HKUST 612 208 and CERG RPC07/08.EG01.

This work was partly supported by CERG grant 612406.