RT info:eu-repo/semantics/article T1 Study of singlet excited state absorption spectrum of Lutetium bisphthalocyanine using femtosecond Z-scan technique A1 Rodríguez Méndez, María Luz A1 Vivas, Marcelo G. A1 Ramos Fernandes, Edson Giuliani A1 Mendonça, Cléber Renato AB In this study we investigate the singlet excited state absorption of lutetium bisphthalocyanine (LuPc2) over a wide spectral range. It was observed distinct nonlinear absorption behaviors; saturable (SA) and reverse saturable absorption (RSA). The RSA effect was observed below 640 and above 680 nm, while SA occurs around the Q-band region, located around 660 nm. To describe the main singlet–singlet transitions, we employed the rate equation model considering the simplified three-energy level diagram. Our results reveal a ratio between excited and ground state absorption smaller than 0.05 at the Q-band region, and of approximately 4 for the other regions. PB Elsevier SN 0009-2614 YR 2012 FD 2012 LK http://uvadoc.uva.es/handle/10324/30703 UL http://uvadoc.uva.es/handle/10324/30703 LA eng NO Chemical Physics Letters, 2012, vol. 531. p. 173-176 NO Producción Científica DS UVaDOC RD 25-abr-2024