Extensive Energy Transfer in a Nearly One-Dimensional Crystal: The Emisson Spectrum of CsMnBr3Doped withNd3+

Abstract

Crystals of a nearly one-dimensional salt, CsMn${\mathrm{Br}}_3$, which have been doped with trivalent neodymium, exhibit emissions from both ${\mathrm{Nd}}^{3+}$ and ${\mathrm{Mn}}^{2+}$. At room temperature the emission from ${\mathrm{Nd}}^{3+}$ is strikingly intense, much stronger than the ${\mathrm{Mn}}^{2+}$ emission. It appears that the manganese excitation migrates rapidly along the anionic chains in CsMn${\mathrm{Br}}_3$ and is trapped by the ${\mathrm{Nd}}^{3+}$ impurities. As the temperature is lowered, the rate of energy migration decreases and the ${\mathrm{Mn}}^{2+}$ emission grows at the expense of the ${\mathrm{Nd}}^{3+}$ emissions. There appears to be little energy transfer below 40 K.