Abstract
The multi-photon ultraviolet upconversion emission properties and synergistic effect are investigated in BaSr2Y6O12:Er3+ phosphor. The deep-ultraviolet emissions centered at 274, 297 and 324-nm are observed under the 1,540-nm excitation, which results from a seven-, six- and six-photon upconversion process, respectively. A synergistic effect is found, which shows that the red emission intensity under 351- and 1,540-nm dual excitation is 4.7 % time stronger than the sum of red emission intensities under the 351 and 1,540-nm single excitation. This phenomenon is attributed to the 4I13/2 and 4I11/2 levels of Er3+ from non-radiative transition process under the 351-nm excitation are excited again to 4F9/2 level by absorbing 1,540-nm photon in the 351- and 1,540-nm dual-excitation process.
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Acknowledgments
This work was supported financially by National Natural Science Foundation of China (No. NSFC51032002), the key Project of the National High Technology Research and Development Program (“863” Program) of China (No. 2011AA050526) and the Science and Technology Support Plan of Jiangsu Province (BE2011191), Natural Science Youth Foundation of Jiangsu Province (BK20130865).
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Zheng, J., Wang, X.F., He, W.Y. et al. Seven-photon ultraviolet upconversion emission of Er3+ induced by 1,540-nm laser excitation. Appl. Phys. B 115, 443–449 (2014). https://doi.org/10.1007/s00340-013-5623-y
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DOI: https://doi.org/10.1007/s00340-013-5623-y