Ultraviolet to near-infrared down-conversion in Bi3+–Yb3+ co-doped YAM phosphor
| Autor: | V. Tsiumra, L. Lipińska, Ya. Zhydachevskyy, Andrzej Suchocki, J. Barzowska, M. Baran |
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| Rok vydání: | 2017 |
| Předmět: |
Photoluminescence
Materials science Process Chemistry and Technology Near-infrared spectroscopy Analytical chemistry Quantum yield Phosphor 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology medicine.disease_cause 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Materials Chemistry Ceramics and Composites medicine Photoluminescence excitation 0210 nano-technology Luminescence Excitation Ultraviolet |
| Zdroj: | Ceramics International. 43:10130-10136 |
| ISSN: | 0272-8842 |
| Popis: | Direct measurements of external quantum yield (QY) were applied to down-converting phosphors of Y 4 Al 2 O 9 (YAM) co-doped with Bi 3+ and Yb 3+ . The QY measurements were combined with studies of photoluminescence (PL), photoluminescence excitation (PLE) and photoluminescence decay kinetics. It was found that the energy transfer occurs mainly from one of the four possible types of Bi 3+ centers in YAM, namely Bi 3+ (I), with excitation and emission maxima at 278 nm and 360 nm, respectively. The absolute QY measurements show large discrepancy between the measured quantum efficiencies of the UV to near-IR down-conversion process and the efficiencies estimated from the shortening of the Bi 3+ luminescence decay time. Results presented in the paper testify the conversion ratio (which should be 2.0 for an ideal quantum cutting mechanism) to be no more than 1.0 in the studied material. |
| Databáze: | OpenAIRE |
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