Journal
CERAMICS INTERNATIONAL
Volume 46, Issue 4, Pages 5271-5277Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.10.276
Keywords
Tunable broadband; Upconversion; Glass ceramics; Yb3+-Mn2+ dimers
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Funding
- National Natural Science Foundation of China [51702172, 61605093]
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology), China [2018-skllmd-11]
- Natural Science Foundation of Ningbo [2018A610042]
- Science Research Fund Project of Ningbo University [XYL18015]
- K. C. WongMagna Fund in Ningbo University
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In comparison to narrow-band upconversion (UC) luminescence from lanthanide-doped systems, broadband UC emission enables a broad and tailorable emissive color, which is desirable for tunable lasers and multicolor display applications. Herein, dual continuous broadband UC emission covering the visible spectral region at 480-720 nm has been achieved for the first time in Yb3+/Mn2+ co-doped glass ceramics (GCs) functionalized with the precipitation of dual-phase gamma-Ga O-2(3)/beta-YF3 nanocrystals. A tunable UC emissive color from yellowish to orange could be obtained under 980 nm excitation by varying the Mn2+ doping content and heat treatment temperature of GCs. We ascribe this phenomenon to the typical transition of exchange-coupled Yb3+-Mn2+ dimers in tetrahedral and octahedral ligand environments. The Stokes and power-dependent UC luminescence properties, fluorescence lifetimes, site occupation and the involved UC mechanism are discussed in detail. This research contributes to a better understanding of the UC process between Yb3+ and Mn2+ in transparent hosts and provides a novel perspective for designing broadband-emitting UC materials.
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