We have investigated two-photon absorption(2PA) characteristics of highly efficient electroluminescent polymers, poly(phenylenevinylene) derivatives with an alkoxy and carbazole or oxadiazole groups as pendants: OxdEh-PPV and CzEh-PPV. We measured two-photon excitation spectra and compared them with one-photon excitation spectra. We found that two- and one-photon transitions satisfy different selection rules. The 2PA coefficients were obtained by measuring the photoluminescence spectra after two- and one-photon absorption. At 840nm, 2PA coefficients of OxdEh-PPV and CzEh-PPV are measured to be 1.0×10-49cm4·s and 4.4×10-49cm4·s, respectively.
|Number of pages||4|
|Journal||Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals|
|State||Published - 2001|
Bibliographical noteFunding Information:
ACKNOWLEDGEMENT: This research was supported by the Korea Science and Engineering Foundation through the CRM of Korea University. K-K. Kim and D.-W. Lee acknowledge the support by the BK21 program of the Ministry of Education, Korea.
- PPV derivatives
- Photoluminescence excitation
- Two-photon absorption