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In this study, we prepared cubic-phase oleic-acid-coated KMnF₃: Yb 3+ ,Er 3+ nanoparticles (NPs) and NaYF₄:Yb 3+ ,Er 3+ NPs, which were about 23 nm. From the down-shifting emissions spectra of the two NPs obtained by 980 nm excitation, we observed the fact that the KMnF₃: 18%Yb 3+ ,1%Er 3+ NPs were a luminescent material with a broadband near-infrared emission of 1.5 μm, and full-width at half-maximum (FWHM) of 55 cm -1 , which was wider than that of the NaYF₄: 18%Yb 3+ ,1% NPs. Therefore, we believe that the oleic-acid-coated KMnF₃:Yb 3+ ,Er 3+ NPs have great potential in fabricating broadband waveguide amplifiers. Through epitaxial growth of a KMnF₃: Yb 3+ active-shell on the core NPs, we compounded KMnF₃:Yb 3+ ,Er 3+ @KMnF₃:Yb 3+ core-active-shell NPs whose 1.5-μm infrared emissions intensity was 3.4 times as strong as that of the core NPs. In addition, we manufactured waveguide amplifiers using KMnF₃:18%Yb 3+ ,1%Er 3+ @KMnF₃:2%Yb 3+ NPs as the core materials of the waveguide amplifiers. When the input signal power was 0.2 mW and the pump power was 200 mW, we achieved a relative gain of 0.6 dB at 1534 nm in a 10-mm long waveguide.

KMnF3:Yb3+,Er3+ Core-Active-Shell Nanoparticles with Broadband Down-Shifting Luminescence at 1.5 μm for Polymer-Based Waveguide Amplifiers