Near-infrared Upconversion Luminescences Properties of Yb3+-Tm3+ Co-doped BiOBr Nanocrystals

作者：Li Yong-Jin^*; Liu Qun; Zhou Yu-Ting; Qiu Jian-Bei; Song Zhi-Guo^*

来源：Journal of Inorganic Materials, 2016, 31(3): 279-284.

• BiOBr: Yb3+, Tm3+
• upconversion luminescence
• near infrared emission

Yb3+-Tm3+ co-doped BiOBr nanocrystals were successfully prepared by hydrothermal method, and its upconversion luminescence properties was investigated. Under excitation at 980 nm light, an intense near-infrared (801 nm) accompanied by weak red (655 nm) and blue emissions (485 nm) were observed, which were attributed to the H-3(4)-> H-3(6), (1)G(4)-> F-3(4) and (1)G(4)-> H-3(6) transitions of Tm3+ ions, respectively. Power dependence studies revealed that blue and red emission resulted from a three-photon process, while the near-infrared emission resulted from a two-photon process, and a possible upconversion mechanism is discussed. As the Yb3+ ions concentration increasing, the overall emission intensity increases and near infrared emission is much stronger than red and blue ones. Consequently, the ratios of near-infrared to visible (I-801 (nm)/I-485 (nm)) reaches 71.4. These results indicate that the Yb3+-Tm(3+)co-doped BiOBr nanocrystals have potential applications in biological field as luminescence labeling probers.

• 出版日期2016-3-20
• 单位昆明理工大学