Spectroscopic properties and upconversion in Pr3+:YF3 nanoparticles

Abstract

The synthesis and spectroscopic investigation of Pr(3+):YF(3) nanoparticles with nominal concentration between 0.05% and 5 at% Pr(3+) are reported. Pr(3+) emission in the visible range of the spectrum is investigated at room temperature and at 10 K as well as time resolved spectroscopy as a function of Pr(3+) concentration. The upconverted emission from the orange to the blue region is observed and the time-resolved spectroscopy of the visible emissions is discussed as a function of the doping level. A careful analysis of the decays permits identification of the main energy-transfer mechanisms that determine the population of the excited levels at various times during the decay.

The down-conversion and up-conversion photoluminescence properties of Na0.5Bi0.5TiO3:Yb3+/Pr3+ ceramics

“…Because the Pr 3þ concentrations in the ceramics are very low, the energy transfer between the Pr 3þ ions can be ignored. [24][25][26] Thus, concentration quenching will not occur in our current cases. Therefore, the visible excitation and emission intensities are proportional to the Pr 3þ contents in unit volume of the samples.…”

Pr3+:β-(Y0.5Gd0.5)F3 as Novel Active Material for Visible Emitting Lasers

“…To apply this calculation the knowledge of the radiative lifetime of the emitting level and the wavelength dependency of the refractive index are necessary. The radiative lifetime is not known yet and was roughly estimated to be 35 µs, which is the value that was found for Pr 3+ -doped -YF 3 nanoparticles [9]. Since no reports on Sellmeier equations could be found in the literature a constant refractive index of 1.5 was assumed.…”

Upconversion Luminescence Sensitized pH-Nanoprobes

“…Amongst the RE 3+ ions, Er 3+ , Ho 3+ , and Tm 3+ are used in most of the studies, as they are known to provide good emission intensity in the visible region of the electromagnetic spectrum. A list of RE ions in various host material [ 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 ] with their different UC emission bands upon 980 nm excitation is shown in Table 1 . The energy levels of Er 3+ — 4 I 15/2 , 4 I 13/2 , 4 I 11/2 , 4 F 9/2 and 2 H 11/2 / 4 S 3/2 are suitable for 800 nm or 980 nm laser light excitation.…”