Abstract

Efficient energy transfer at room temperature from Tm3+ to Pr3+ has been demonstrated in co-doped KPb2Cl5. Because of the low phonon energies in KPb2Cl5, the energy transfer processes result in the conversion of 805nm laser diode pump energy to a broad band of mid-IR radiation between 3500to5500nm. Energy transfer pathways, rates, and quantum efficiencies are evaluated. Results show that the material is suitable as a phosphor for the 4to5μm spectral range that can be optically pumped with low-cost 0.8μm laser diodes.

© 2010 Optical Society of America

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