Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10633471 | Optical Materials | 2005 | 7 Pages |
Abstract
The infrared to visible upconversion mechanisms of Nd3+ ions in potassium lead chloride crystal have been investigated at liquid nitrogen temperature (LNT). We have observed upconversion luminescence when pumping into both 4F3/2 and 4F5/2 bands and off-resonance, at 851 and 856 nm. The main bands appearing in the emission spectra are two blue bands located at 420 and 435 nm, corresponding to transitions 4D3/2 â 4I13/2 and 2P1/2 â 4I9/2 respectively, and green, orange and red emissions, located at 535, 595 and 668 nm, corresponding to 4G7/2-4G9/2 â 4I9/2, 4I11/2, 4I13/2 transitions, respectively. The results show that, upon excitation of either the 4F3/2 or 4F5/2 band at LNT, two- and three-body energy transfer upconversion process are responsible for the emissions coming from levels 4G7/2-4G9/2 (535, 595, and 668 nm) and 4D3/2 (420 nm), respectively. However, the experimental data indicate that the mechanisms leading to the luminescence coming from level 2P1/2 depend on the pumping wavelength and sample temperature.
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Physical Sciences and Engineering
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Authors
A. Mendioroz, R. Balda, M. Al-Saleh, J. Fernández,