Anomalous upconversion luminescence of SrMoO 4:Yb 3+/Er 3+ nanocrystals by high excited state energy transfer

Dongyu Li, Zhen Huang, Zhongquan Nie, Lixin Zhang, Yunfeng Bai, Xueru Zhang, Yinglin Song, Yuxiao Wang

    Research output: Contribution to journalArticlepeer-review

    16 Citations (Scopus)

    Abstract

    The SrMoO₄:Yb³⁺/Er³⁺ nanocrystals (NCs) were synthesized by sol-gel method. The upconversion luminescence properties of SrMoO₄:Yb³⁺/Er³⁺ NCs were studied in contrast to the identical dopants in Y₂O₃ NCs under the same experimental conditions. The results demonstrate that the green emission intensity of the former is much stronger than that of the latter, while the red emission intensity is reverse. Interestingly, the green-to-red intensity ratio of SrMoO₄:Yb³⁺/Er³⁺ NCs increases with the increase of Yb³⁺ concentration at fixed Er³⁺ concentration. The anomalous luminescence properties of SrMoO₄:Yb³⁺/Er³⁺ NCs are attributed to the high excited state energy transfer (HESET) from the |²F₇/₂, ³T₂> state of the sensitizer Yb³⁺−MoO₄²⁻ dimer to the ⁴F₇/₂ level of the activator Er³⁺. The HESET process can partly decrease the lattice phonon quenching processes at lower energy levels of Er³⁺ and enhance the green emission dramatically.
    Original languageEnglish
    Pages (from-to)799-804
    Number of pages6
    JournalJournal of Alloys and Compounds
    Volume650
    DOIs
    Publication statusPublished - 25 Nov 2015

    Keywords

    • Upconversion
    • High excited state energy transfer
    • SrMoO₄
    • SrMoO4

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