Effects of Chromophore Conjugation Length and Concentration on the Photostability of Indoline-Based Nonlinear Optical Chromophore/Polymer Films

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• 作者：Yasar Kutuvantavida ; Grant V. M. Williams ; M. Delower H. Bhuiyan ; Sebastiampillai G. Raymond ; Andrew J. Kay
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：February 12, 2015
• 年：2015
• 卷：119
• 期：6
• 页码：3273-3278
• 全文大小：316K
• ISSN：1932-7455

文摘

Photostability measurements were made on host鈥揼uest thin films containing nonlinear optical chromophores with an indoline donor and amorphous polycarbonate. We find that the indoline-based chromophores are nearly 10 times more photostable than an analogous compound previously studied and which has a dihydopyridine donor. There is an enhancement of the photostability with increasing chromophore concentration and conjugation length. This can be attributed to a reduction in the average separation between the chromophores and excited state singlet energy transfer to adjacent chromophores followed by eventual nonradiative decay. This leads to a reduction in the singlet oxygen generation rate as the chromophore concentration or conjugation length is increased.