Ultrabroad near-infrared photoluminescence from ionic liquids containing subvalent bismuth.
We have shown that Lewis-acidic halogenoaluminate ionic liquid (IL) containing subvalent bismuth can be used as a near-IR (NIR) luminescent material. Raman and absorption spectra evidence the coexistence of Bi(5)(3+) and Bi(+) in the liquid. The Bi(5)(3+) and Bi(+) emitters, stabilized by this Lewis-acidic liquid, demonstrate ultrabroad NIR photoluminescence with a lifetime of around 1 μs. We envisage that the bismuth activated ILs would not only enrich the well-established spectrum of soft luminescent materials but also might promote the design of novel photonic materials activated by other p-block elements.
International Center for Young Scientists (ICYS), National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba-city, Ibaraki 305-0047, Japan. timothyhsun@gmail.com
Hong-Tao
HT
Sun
Yoshio
Y
Sakka
Minoru
M
Fujii
Naoto
N
Shirahata
Hong
H
Gao