Hong-Tao Sun, Yoshio Sakka, Naoto Shirahata, Hong Gao
The photophysical properties of Bi82+ and Bi53+ polycations stabilized by
[AlCl4]- have been studied experimentally and theoretically. The otained
product was thoroughly characterized by powder X-ray diffraction and
steady-state and time-resolved spectroscopy, making it clear that both Bi82+
and Bi53+ contribute to the observed near infrared emission. Furthermore, it
was revealed that Bi82+ polycation mainly results in the emission peaking at
ca. 1180 nm, while Bi53+ the longer-wavelength emission. The following quantum
chemistry calculation on Bi82+ polycation helps us attribute some observed
excitation bands to specific electronic transitions of bismuth polycations. It
is believed that systematical investigation of structural and luminescent
properties as well as detailed quantum chemistry calculation of molecular
crystals containing such kinds of bismuth units allows us to obtain a clearer
picture on bismuth-related photophysical behaviors, which not only serve to
solve the confusions on the luminescence origin of bismuth in other material
systems such as glasses and bulk crystals, but also is helpful to develop novel
applicable broadband tunable laser mediums.
View original:
http://arxiv.org/abs/1202.5395
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