1 research outputs found
Upconversion Emission Enhancement of NaYF<sub>4</sub>:Yb,Er Nanoparticles by Coupling Silver Nanoparticle Plasmons and Photonic Crystal Effects
Metal nanoparticle plasmons or the
photonic crystal effect are being widely used to modify luminescence
properties of materials. However, coupling of surface plasmons with
photonic crystals are seldom reported for enhancing luminescence of
materials. In this paper, a new method for upconversion emission enhancement
of rare-earth doped nanoparticles is reported, attributed to the coupling
of surface plasmons with photonic band gap effects. Opal/Ag hybrid
substrates were prepared by depositing Ag nanoparticles on the top
layer of opals by magnetron sputtering. The selective enhancement
of red or green upconversion emission of NaYF<sub>4</sub>:Yb<sup>3+</sup>,Er<sup>3+</sup> nanoparticles on the opal/Ag hybrid substrates is attributed
to the coupling effect of surface plasmons and Bragg reflection of
the photonic band gap. In addition, the upconversion emission enhancement
of NaYF<sub>4</sub>:Yb<sup>3+</sup>,Er<sup>3+</sup> nanoparticles
on the opal/Ag hybrid substrate is attributed to the excitation enhancement
was obtained when the excitation light wavelengths overlap with the
photonic band gaps of opal/Ag hybrid substrates. We believe that these
enhancement effects based on the coupling of metal nanoparticles with
the photonic band gap could be extended to other light-emitting materials,
which may result in a new generation of lighting devices