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Intense visible upconversion photoluminescence in GeGaS: Ho3 glasses

Authors: Prokop Vít | Střižík Lukáš | Segawa Hiroyo | Wada Yoshiki | Oswald Jiří | Wágner Tomáš

Year: 2018

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	Intense visible upconversion photoluminescence in GeGaS: Ho3 glasses	Upconversion photoluminescence (UCPL) emission originating from intra-4f electronic transitions have been studied in GeGaS: Ho3+ glasses at excitation wavelengths of 760 and 910 nm. The strongest UCPL emission was detected in visible spectral region at wavelengths of 490, 550 and 660 nm. The UCPL intensities and their ratios have been evolved by changing of the Ho3+ concentration as well as pump power as was proved by the UCPL emission spectroscopy and by double logarithmic dependence of the UCPL emission intensity on the pump power [1]. UCPL emission intensity increases with increasing Ho3+ ions content up to 1 at.%. In the case of 910 nm excitation, the emission color has been changed from bluish-white through white to red with increasing Ho3+ ions concentration. Changes of the UCPL emission intensities and the UCPL emission band ratios are attributed to the presence of energy transfer upconversion (ETU) and cross-relaxation processes (CR) mixed with the excited state absorption (ESA) [2]. Thereby, the UCPL emission can be tuned via the Ho3+ concentration and/or excitation wavelength adjustment making these materials perspective for lasers, detectors, displays, etc [3]. REFERENCES [1] W. Guo, H. Hao, S. Jin, Q. Su, H. Li, X. Hu, Y. Gan, L. Qin, W. Gao, G. Liu: Ceram. Int., 43, 4330-4334 (2017). [2] H. Zhang, Y. Bu, X. Yang, S. Xiao, J.W. Ding: Mater. Sci. Eng. B, 176, 256-259 (2011). [3] F. Lahoz, I.R. Martin, J.M. Calvilla-Quintero: Appl. Phys. Lett., 86, 051106 (2005).	Chalcogenide Glasses; Upconversion Photoluminescence; Holmium; Photoluminescence Spectroscopy; Power Dependence