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Spectrochim Acta A Mol Biomol Spectrosc. 2018 Feb 5;190:312-317. doi: 10.1016/j.saa.2017.09.023. Epub 2017 Sep 13.

Cooperative upconversion luminescence of Er3+ in Gd2O3-xSx phosphor.

Author information

1
State Key Laboratory of Complex Nonferrous Metal Resources Clear Utilization in Yunnan Province, National Engineering Laboratory for Vacuum Metallurgy, Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, People's Republic of China; Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44 bus 2450, 3001 Leuven, Belgium. Electronic address: feiwang@kmust.edu.cn.
2
State Key Laboratory of Complex Nonferrous Metal Resources Clear Utilization in Yunnan Province, National Engineering Laboratory for Vacuum Metallurgy, Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, People's Republic of China.

Abstract

Gd2O3-xSx:Er crystals were prepared through high-temperature solid-state reaction method in vacuum, with the vacuum synthesis mechanism determined by thermal analysis. The crystal structure and upconversion luminescence properties were investigated respectively by XRD, TEM and spectrophotometer. Well crystallized Gd2O2S:Er phosphors were prepared under 1000°C in vacuum with a certain excessive amount of sulfur content than stoichiometric. It is confirmed that with the increasing sulfur content the green emission was enhanced and red emission was weakened. The cooperative upconversion luminescence of Er3+ in non-stoichiometric Gd2O3-xSx crystals was interpreted as a result of two photon absorption and the photon avalanche process.

KEYWORDS:

Lifetime; Photon avalanche process; Super lattice; Upconversion luminescence; Vacuum

PMID:
28941884
DOI:
10.1016/j.saa.2017.09.023

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