4.6 Article

Yb3+/Ln3+/Cr3+ (Ln = Er, Ho) doped transparent glass ceramics: crystallization, Ln3+ sensitized Cr3+ upconversion emission and multi-modal temperature sensing

Journal

JOURNAL OF MATERIALS CHEMISTRY C
Volume 5, Issue 45, Pages 11769-11780

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c7tc04410k

Keywords

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Funding

  1. Zhejiang Provincial Natural Science Foundation of China [LR15E020001]
  2. National Natural Science Foundation of China [51572065]
  3. 151 Talent's Projects in the Second Level of Zhejiang Province
  4. College Student's Activities of Science and Technology Innovation in Zhejiang Province [2016R407063]

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Currently, efficient photon anti-Stokes (upconversion) luminescence is mostly limited to lanthanide (Ln(3+)) doped materials. There are a few reports on upconversion behaviors of transition-metal ions, whose (Stokes) emissions are known to be tunable by changing the crystal fields of the hosts. Herein, Yb/Ln/Cr (Ln = Er, Ho) tri-doped glass ceramics were fabricated by a melt-quenching route and subsequent glass crystallization, where Cr3+ dopants were evidenced to be incorporated into the precipitated LiGa5O8 nanocrystals and Ln(3+) ions remained in the glass matrix. An intense Cr3+ upconversion luminescence assigned to the E-2 -> (4)A(2) transition was observed upon 980 nm laser excitation via energy transfer from Yb3+ sensitizers to Er3+ activators/bridging-centers and finally to Cr3+ emitting centers. Importantly, the investigated glass ceramics presented temperature-dependent upconversion fluorescence intensity ratios for Er3+ H-2(11/2)/S-4(3/2) thermally coupled states as well as Cr3+/Ln(3+) non-thermally coupled states and temperature-sensitive upconversion decays of Cr3+ E-2/(4)A(2) thermally coupled states, enabling their promising applications in self-calibrated multi-modal temperature sensing.

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