The fluorescent characteristics of Troger’s base have been investigated experimentally. A one-photon-induced fluorescent spectrum was observed, and the peak wavelength was at 337 nm with a full width at half-maximum of ~85nm . The violet radiation of the Troger’s base crystal could result from the π<sup>*</sup> –π transition of the benzenoid π bond. Two-photon-pumped frequency-upconverted fluorescence was obtained, which is a wideband emission with the main peak wavelength at 337 nm and a subordinate peak. Donor groups and acceptor groups of electrons in the aromatic rings strengthen the two-photon-pumped frequency-upconverted fluorescence.
© 1999 Optical Society of America
Lijuan Zhao, Jing Jun Xu, Guangyin Zhang, Xianhe Bu, and Mitsuhiko Shionoya, "Frequency-upconverted organic crystal," Opt. Lett. 24, 1793-1795 (1999)