Abstract
Previously we have reported intrinsic instabilities of the luminescent intensity from a variety of Yb-containing compounds. In heavy metal halides this phenomenon has been explained as a manifestation of driven local field effects in dense radiation systems. While earlier observations revealed abrupt changes in luminescent intensity under quasi-static conditions, no abrupt changes in the wavelength of the emitted light were found. Here we report the first observations of intrinsic chromatic instabilities that accompany bistability of the luminescent intensity in a multi-ion system.
© 2001 Optical Society of America
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