InGaN-LD-Pumped &lt;inline-formula&gt; &lt;tex-math notation="TeX"&gt;${\rm Pr}^{3+}$&lt;/tex-math&gt;&lt;/inline-formula&gt;: &lt;inline-formula&gt; &lt;tex-math notation="TeX"&gt;${\rm LiYF}_{4}$&lt;/tex-math&gt;&lt;/inline-formula&gt; Continuous-Wave Laser at 915 nm

We developed a procedure to prepare luminescent LiYF4:Yb/LiYF4 and LiYF4:Yb,Er/LiYF4 core/shell nanocrystals with a size of approximately 40 nm revealing luminescence decay times of the dopant ions that approach those of high-quality laser crystals of LiYF4:Yb (Yb:YLF) and LiYF4:Yb,Er (Yb,Er:YLF) with identical doping concentrations. As the luminescence decay times of Yb3+ and Er3+ are known to be very sensitive to the presence of quenchers, the long decay times of the core/shell nanocrystals indicate a very low number of defects in the core particles and at the core/shell interfaces. This improvement in the performance was achieved by introducing two important modifications in the commonly used oleic acid based synthesis. First, the shell was prepared via a newly developed method characterized by a very low nucleation rate for particles of pure LiYF4 shell material. Second, anhydrous acetates were used as precursors and additional drying steps were applied to reduce the incorporation of OH− in the crystal lattice, known to quench the emission of Yb3+ ions. Excitation power density (P)-dependent absolute measurements of the upconversion luminescence quantum yield (ΦUC) of LiYF4:Yb,Er/LiYF4 core/shell particles reveal a maximum value of 1.25% at P of 180 Wcm−2. Although lower than the values reported for NaYF4:18%Yb,2%Er core/shell nanocrystals with comparable sizes, these ΦUC values are the highest reported so far for LiYF4:18%Yb,2%Er/LiYF4 nanocrystals without additional dopants. Further improvements may nevertheless be possible by optimizing the dopant concentrations in the LiYF4 nanocrystals.

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A diode-pumped femtosecond Pr:YLF laser emitting at the near-infrared 915 nm

Luo

Geng

et al. 2022

Optics & Laser Technology

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InGaN-LD-Pumped <inline-formula> <tex-math notation="TeX">${\rm Pr}^{3+}$</tex-math></inline-formula>: <inline-formula> <tex-math notation="TeX">${\rm LiYF}_{4}$</tex-math></inline-formula> Continuous-Wave Laser at 915 nm

Cited by 7 publications

References 19 publications

Modeling and analysis of red emission in $$\hbox {Pr}^{3+}$$ Pr 3 + -doped fiber lasers

Modeling and analysis of red emission in $$\hbox {Pr}^{3+}$$ Pr 3 + -doped fiber lasers

LiYF4:Yb/LiYF4 and LiYF4:Yb,Er/LiYF4 core/shell nanocrystals with luminescence decay times similar to YLF laser crystals and the upconversion quantum yield of the Yb,Er doped nanocrystals

A diode-pumped femtosecond Pr:YLF laser emitting at the near-infrared 915 nm

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