Abstract

To improve the laser action properties of the pyrromethene-BF2 (P-BF2) complexes, we studied substitution effects at different positions of the dye molecule on the electronic spectra of several derivatives. Specifically, we used laser photoselection spectroscopy to measure the triplet–triplet (T–T) absorption and polarization spectra as well as the fluorescence and visible absorption singlet–singlet (S–S) spectra of the following compounds: 1,2,3,5,6,7,8-heptamethyl; 8-acetoxymethyl-1,3,5,7-tetramethyl-2,6-diethyl; 1,3,5,7-tetramethyl-8-p-methoxyphenyl; 3,5-dimethyl-1,7-diphenyl; and 1,3,5,7,8-pentamethyl-2,6-diphenyl P-BF2 complexes. The 1,3,5,7-tetramethyl P–BF2 complex itself exhibits weak T–T absorption, which stretches from the green to the near-IR spectral region. This band consists of two overlapping (differently polarized) T–T transitions. Short molecular axis (i.e., 8 and 1,7 positions) substitution causes the positively polarized T–T transition to gain considerably in intensity. Significantly, the negatively, long-axis-polarized T–T transition was unaffected by the long-axis 2,6-position disubstitution. Therefore, only the 2,6-position disubstitution is expected to produce superior new P-BF2 complex laser dyes. Substitution effects from strongly interacting groups with chromophores on S–S as well as T–T absorption spectra, together with cw laser photoselection spectroscopy, are briefly reviewed.

© 1992 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Laser action from 1,3,5,7-tetramethyl-2,6-diethyl-8-n-propyl pyrromethene-BF2

Heping Zeng, Feng Liang, Zhenrong Sun, Yizhong Yuan, Zuguang Yao, and Zhizhan Xu
J. Opt. Soc. Am. B 19(6) 1349-1354 (2002)

Eight-position substitution effects on laser action of the 1,3,5,7-tetramethyl-2,6-diethyl pyrromethene-BF2 complexes

Feng Liang, Heping Zeng, Zhenrong Sun, Yizhong Yuan, Zuguang Yao, and Zhizhan Xu
J. Opt. Soc. Am. B 18(12) 1841-1845 (2001)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (6)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription