Journal
MATERIALS CHEMISTRY FRONTIERS
Volume 5, Issue 13, Pages 5142-5149Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1qm00440a
Keywords
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Funding
- National Natural Science Foundation of China [11904361, 12074374, 11874055, 11974346, 51772286]
- Youth Innovation Promotion Association CAS [2020222]
- Chinese Academy of Sciences [2020SYHZ0013]
- Jilin Province [2020SYHZ0013]
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The study reveals that monoclinic ZrO2 has faster radiative transition rates for Er3+ and Yb3+, leading to higher luminescence efficiency of rare earth ions. The optimized m-ZrO2:2%Er3+,9%Yb3+ shows 4 times stronger upconversion luminescence compared to the optimized cubic ZrO2:2%Er3+,14%Yb3+. Additionally, m-ZrO2 exhibits dual-color optical thermometry behavior.
Er3+ and Yb3+ heavily doped monoclinic ZrO2 (m-ZrO2) stabilized by Nb5+ is prepared by solid-state reactions. The upconversion luminescence (UCL) of concentration optimized m-ZrO2:2%Er3+,9%Yb3+ shows a yellow emission which is found to be 4 times stronger than the red UCL of the optimized cubic ZrO2:2%Er3+,14%Yb3+. It is revealed that monoclinic ZrO2 has faster radiative transition rates of Er3+ and Yb3+ than cubic ZrO2 because of the lower crystal symmetry in the monoclinic phase that enables higher 4f-5d mixing of rare earth ions. The enhanced radiative transition allows 9%Yb3+ in the monoclinic phase to have a similar absorption of 980 nm excitation light to that of 14%Yb3+ in the cubic phase, thus retaining the lower energy back transfer from Er3+ in the green emitting state to Yb3+ and lower concentration quenching of Yb3+ in the monoclinic phase. The green and red dual-color optical thermometry behavior of m-ZrO2 has been explored. A large detectable temperature range, at which the absolute sensitivity is high, is realized through adopting this complementary optical thermometer. Repeated thermal experiments prove the stability of the m-ZrO2 as a temperature probe. Our results indicate that heavily doped m-ZrO2 is an excellent host for efficient luminescence of rare earth ions.
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