1975年6月15日 · The decay of the excited 4S3/2 state of Er3+ ions in LaF3 at 295°K has been investigated in detail. The energy is transferred from the thermally populated multiplet 2H11/2. The decay curve of the...

Er3+ doped and Er3+/Yb3+ co-doped superfine LaF3 powders are prepared using co-precipitation method. The sample shows spherical particles with size of about 250 nm. The quantum efficiencies of 4S3/2 and 4F9/2 levels in the prepared Er3+ doped LaF3 powders are calculated to be 67.0% and 71.9%, respectively.

2008年2月1日 · Here, the authors present the synthesis of LaF3:0.04Yb3+,0.01Er3+ nanocrystals with oleic acid as a capping ligand. The nanocrystals are monodispersible and form a fully transparent colloidal solution, which is stable for a long time.

2020年4月15日 · In the present study, the comparison of UC emission from Er 3+ is investigated by varying host matrix, including hexagonal LaF 3, rhombohedral (R-) and tetragonal (T-) LaOF. The tetragonal LaOF:Er/Yb exhibits the most intensive emission under the same condition.

Upon 980-nm laser excitation, LaF3: Er 3+ nanofibers emit green and red up-conversion emissions centering at 520, 538 and 649 nm, respectively. The green emissions come from the transitions of 2H11/2/4S3/2 →4 I15/2 of Er3+ ions, and the red emission is arisen from the transition of 4F9/2→4I15/2 of Er 3+ ions.

1974年4月1日 · This method of calculation was introduced by Weber for calculating radiative probabilities of Er3+ and Pr3+ in LaF3 [7, 8]. The calculated radiative lifetimes are then combined with measured fluorescent lifetimes to predict radiative quantum efficiencies - ~b.

2020年12月10日 · The photoluminescence (PL) spectra of the LaF3 nanocrystals could be tuned by altering the doping ratio of Er3+, Ho3+, and Tm3+. In addition, the PL intensities increased after coating the UCNP cores with an active shell.

2020年12月3日 · Lanthanum fluoride crystals doped with the rare earth ions (LaF 3:Er 3+), having a low-frequency phonon spectrum (\ ( { {\omega }_ {m}} \cong 300-350\, {\text {c}} { { {\text {m}}}^ { { - 1}}}\)), are one of the promising laser materials for obtaining the lasing in the mid-infrared (MIR) wavelength region, [1].

The rates of radiative and nonradiative decay were determined for several excited states of Er3+ in LaF3 from calculated spontaneous emission probabilities and measured lifetimes. Electric-dipole, magnetic-dipole, and electric-quadrupole transition probabilities were evaluated using intermediate coupled states derived from computer ...

2017年8月4日 · It has been possible to synthesize LaF 3: Er 3+, Yb 3+ nanoparticles, which are light emitters by upconversion, using the co-precipitation method followed by a thermal treatment at temperatures of 400°C, 500°C and 600°C.