Infrared‐to‐Visible Light Conversion in Er3+–Yb3+:Lu3Ga5O12 Nanogarnets |
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| Authors: | Mamilla Rathaiah Pamuluri Haritha Dr Kadathala Linganna Dr Virginia Monteseguro Dr Inocencio Rafael Martín Dr Antonio Diego Lozano‐Gorrín Dr Palamandala Babu Prof Chalicheemalapalli Kulala Jayasankar Dr Victor Lavín Dr Vemula Venkatramu |
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| Affiliation: | 1. Department of Physics, Yogi Vemana University, Kadapa-, India;2. School of Information and Communications, Gwangju Institute of Science and Technology, Gwangju, South Korea;3. Departamento de Física, MALTA Consolider Team, Instituto Universitario de Materiales y Nanotecnología (IMN), Instituto Universitario de Estudios Avanzados en Física, Atómica, Molecular y Fotónica (IUdEA), Universidad de La Laguna, Santa Cruz de Tenerife, Spain;4. Department of Physics, Government Degree College, Satyaveedu-, India;5. Department of Physics, Sri Venkateswara University, Tirupati-, India |
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| Abstract: | Er3+–Yb3+ co‐doped Lu3Ga5O12 nanogarnets were prepared and characterized; their structural and luminescence properties were determined as a function of the Yb3+ concentration. The morphology of the nanogarnets was studied by HRTEM. Under 488 nm excitation, the nanogarnets emit green, red, and near‐infrared light. The decay curves for the (4S3/2, 2H11/2) and 4F9/2 levels of the Er3+ions exhibit a non‐exponential nature under resonant laser excitation and their effective lifetimes are found to decrease with an increase in the Yb3+ concentration from 1.0 to 10.0 mol %. The non‐exponential decay curves are well fitted to the Inokuti–Hirayama model for S=8, indicating that the mechanism of interaction for energy transfer between the optically active ions is of dipole–quadrupole type. Upon 976 nm laser excitation, an intense green upconverted emission is clearly observed by the naked eyes. A significant enhancement of the red‐to‐green intensity ratio of Er3+ ions was observed with an increase in Yb3+ concentration. The power dependence and the dynamics of the upconverted emission confirm the existence of two‐photon upconversion processes for the green and red emissions. |
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| Keywords: | dynamics lifetime luminescence nanogarnets upconversion |
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