Abstract

Efficient energy transfer at room temperature from ${\mathrm{Tm}}^{3+}$ to ${\mathrm{Pr}}^{3+}$ has been demonstrated in co-doped $\mathrm{K}{\mathrm{Pb}}_2{\mathrm{Cl}}_5$. Because of the low phonon energies in $\mathrm{K}{\mathrm{Pb}}_2{\mathrm{Cl}}_5$, the energy transfer processes result in the conversion of $805\mathrm{nm}$ laser diode pump energy to a broad band of mid-IR radiation between $3500\text{to}5500\mathrm{nm}$. Energy transfer pathways, rates, and quantum efficiencies are evaluated. Results show that the material is suitable as a phosphor for the $4\text{to}5\mu m$ spectral range that can be optically pumped with low-cost $0.8\mu m$ laser diodes.

© 2010 Optical Society of America

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