Enhanced red and near-infrared upconversion luminescence properties in CaSc2O4 microcrystals

He, Xin; Wang, Xue; Zhang, Zehua; Zuo, Ruiliang; Wang, Lili

doi:10.1016/j.cplett.2020.137425

Cited by 3 publications

(1 citation statement)

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“…Upconversion materials co-doped with Yb 3+ and Er 3+ ions tend to emit strong green light and relatively weak red light 11 . Unfortunately, the poor penetration of green luminescence into biological tissues limits the biomedical applications of this class of materials, whereas light located in the red to near-infrared wavelength band (650–1350 nm) has a strong biological tissue penetration capability 12 , 13 . Therefore, red UCL materials are very interesting for optical temperature measurement, bio-imaging, and medical diagnostics 14 – 16 .…”

Section: Introductionmentioning

confidence: 99%

Large enhancement of red upconversion luminescence in beta Ba2Sc0.67Yb0.3Er0.03AlO5 phosphor via Mn2+ ions doping for thermometry

Liu,

Duan,

Zhou

et al. 2024

Sci Rep

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Here, this study reports single-band red upconversion emission in β-Ba2ScAlO5: Yb3+/Er3+ phosphor by doping Mn2+. The optimum concentration of Mn2+ ions in β-Ba2ScAlO5: Yb3+/Er3+ phosphor was 0.20. The intensity of red and green emissions is increased by 27.4 and 19.3 times, respectively. Compared with the samples without Mn2+ ions, the red-green integral strength ratio of β-Ba2ScAlO5: Yb3+/Er3+/Mn2+ sample was significantly increased by 28.4 times, reaching 110.9. The UCL mechanism was explored by analyzing the down-conversion luminescence spectra, absorption spectra, UCL spectra, and upconversion fluorescence lifetime decay curves of Yb3+/Er3+/Mn2+ co-doped β-Ba2ScAlO5. The enhancement of upconversion red light is achieved through energy transfer between defect bands and Er3+ ions, as well as energy transfer between Mn2+ ions and Er3+ ions. In addition, the Mn2+ doped β-Ba2ScAlO5: Yb3+/Er3+ red UCL phosphors have great potential for ambient temperature sensing in the 298–523 K temperature range. The maximum sensitivity of β-Ba2ScAlO5: Yb3+/Er3+/Mn2+ phosphor as a temperature sensor at 523 K is 0.0247 K−1.

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