Abstract
The novel core@shell nanocrystals β-NaLuF4@NaLuF4 co-doped with rare-earth ions Er3+, Yb3+, Ce3+ have been synthesized. The nano-particles indicate the intensive lines of anti-Stokes luminescence in the telecommunication С - band of spectrum when pumped at 970-980 nm. The nanoparticles have been characterized by transmission electron microscopy and spectrofluorimetry. The nanoparticles have a size 40-80 nm and possess the intensive photo-luminescence 73 nm bandwidth centered around 1530 nm. The photo-luminescence kinetics of β-NaLuF4: Er3+/ Yb3+/ Ce3+ has been studied in IR range of spectrum. We have demonstrated that doping with cerium ions prevents serial stepwise excitation of erbium ions. Consequently, the lifetime of transition in erbium 4I13/2→4I15/2 has risen up to 6.9 ms. Intensity of 1530 nm line in Er3+ ions excited at 980 nm has been increased up to 6 times. Therefore, the nanoparticles are applicable to fabrication of compact waveguide amplifiers for C - band.
Highlights
Nano-sized phosphor crystals form a new generation of nanomaterials as they possess the unique optical properties attractive for applications in telecommunications technology, integrated optics and photonics
The unique luminescent properties of nanophosphors are the result of successive absorption of photons by ytterbium ions and resonant non-radiative energy transfer to the erbium ions within the matrix of the hexagonal β-NaLuF4 phase inorganic nanocrystal [1]
The pump photon at 980 nm is absorbed by the ion Yb3+, transferring the latter into the excited state 2F5/2
Summary
Nano-sized phosphor crystals form a new generation of nanomaterials as they possess the unique optical properties attractive for applications in telecommunications technology, integrated optics and photonics. The unique luminescent properties of nanophosphors are the result of successive absorption of photons by ytterbium ions and resonant non-radiative energy transfer to the erbium ions within the matrix of the hexagonal β-NaLuF4 phase inorganic nanocrystal [1]. The pump photon at 980 nm is absorbed by the ion Yb3+, transferring the latter into the excited state 2F5/2.
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