Simultaneous observation of green multiphoton upconversion and red and blue NLO processes from polymeric terbium(III) complexes

(Figure Presented) Red, green, and blue emissions are observed simultaneously for an organoterbium complex that displays remarkable multiphoton upconversion when excited by a near-infrared light source. The system undergoes two nonlinear optics processes simultaneously: second and third harmonic generation (SHG: red emission; THG: blue), and four-photon upconversion (green) for excitation at λ ≈ 1.26 (see diagram). © 2005 Wiley-VCH Verlag GmbH & Co. KGaA.link_to_subscribed_fulltex