Visible upconversion luminescence of Tb3+ ions in Y2O3 nanoparticles induced by a near-infrared femtosecond laser

Time‐Resolved FRET Biosensor Based on Amine‐Functionalized Lanthanide‐Doped NaYF4 Nanocrystals

“…The intense emission, high quantum efficiency, and long PL lifetime for both solutions are closely related to the large energy gap between 5 D 4 and its next lower lying 7 F J (J = 3, 4, 5, 6) states of Tb 3+ . [15] The weaker PL intensity, lower quantum yield, and shorter PL lifetime of NCs after biotinylation may be due to nonradiative-relaxation-induced PL quenching associated with the surface high-energy vibronic groups [16] (N À H and C À N) of biotin, as already revealed in the FTIR spectra.…”

Enhancement of upconversion luminescence of Y2O3:Er3+ nanocrystals by codoping Li+–Zn2+

“…Among inorganic host, Y 2 O 3 exhibits higher mechanical, thermal, and chemical stability and constitutes a good candidate for biomedical and photonic applications [2,15,16]. In this study, Y 2 O 3 :Er 3+ nanocrystals were chosen to accomplish high intensity and monochromatic green UC luminescence.…”

Luminescence enhancement by energy transfer in melamine-Y2O3:Tb3+ nanohybrids

“…where s r and s nr represent radiative and non-radiative lifetime contribution to the overall time decay s. 12 Pristine Y 2 O 3 :Tb 3þ nanostructured luminescence can be fitted with two exponentials with lifetimes s 1 ¼ 0.13 ms and s 2 ¼ 0.78 ms (all expressed with an accuracy of 5%). Multiexponential trend of terbium luminescence decay has been encountered in several works, especially in Gd 2 O 3 :Tb systems.…”

“…11 Moreover, it has been showed a good efficient codoping-free upconversion process when irradiated with femtosecond sources. 12 However, the reduced photoluminescence (PL) quantum efficiency and, mainly, the deep UV excitation spectrum have strongly inhibited its use in Y 2 O 3 doped crystal.…”