Effects of Bi3+ doping on the optical properties of Er3+:Y2O3

Synthesis and characterization of Er3+ doped CaF2 nanoparticles

“…In addition to these RE ions mentioned above, the erbium (Er) element is one important and particular RE ion with rich energy levels, especially the plenty of upconversion emission channels. Many researches [16][17][18][19][20][21][22][23] based on a number of nanometer-sized host doped with Er 3+ ion were carried out, and the host matrix dependence of luminescence were studied. Considering the particular advantages of CaF 2 , especially its properties of high transparence and low phonon energy, the researches combining the active ion Er and host CaF 2 have drawn increasing interests.…”

Effect of Bi3+ doping on the quenching concentration of 2H11/2/4S3/2 level of Er3+

“…So the enhancement of green emission is caused by two reasons: one is the increase of the quenching concentration of 2 H 11/2 / 4 S 3/2 , which populates the 2 H 11/2 / 4 S 3/2 level; the other is the modification of the crystal field around Er 3+ , which increases the radiative transition ratio. According to our previous research, the modification of the crystal field can contribute a factor of 1.5 to the total enhancement of green emission [16]. The increased quenching concentration of 2 H 11/2 / 4 S 3/2 level thus contributes a factor of about 1.3 to the total enhancement factor of 1.9.…”

“…To understand the mechanisms which populate the ( 2 H 11/2 / 4 S 3/2 ) green and ( 4 F 9/2 ) red emission levels, the upconversion luminescence intensity was measured as a function of the pump power. It is known that for unsaturated upconversion processes, the number of photons which are required to populate the upper emitting state can be obtained by the following relation [16]:…”

Temperature dependence of Er3+ ionoluminescence and photoluminescence in Gd2O3:Bi nanopowder

“…The absorption of exciting photons is followed by the efficient energy transfer from Bi 3+ to Ln 3+ ions. Yang et al in [15] studied an influence of Bi 3+ ions on Er 3+ ions in a Y2O3 host and showed that the presence of Bi 3+ ions enhances the intensity of the Er 3+ emission for a 330 nm excitation of approximately 42 times. For the Gd2O3 host, the maximum intensity in the excitation spectrum was centered around 340 nm [13].…”