Efficient Yb3+ sensitized Er3+ emission of Bi2ZnOB2O6:Yb3+/Er3+ single crystal

Controllable crystal form transformation and temperature sensing properties studies of K3Sc0.5Lu0.5F6: Ho3+, Yb3+ with cryolite structure

“…state of Ho 3+ ions to the surrounding environment without radiating photons, resulting in the higher luminous intensity of the cubic form than that of the monoclinic form. 59,60 In order to investigate the up-conversion emission mechanism, the power-dependent up-conversion emission spectra of the monoclinic KSLF: 0.04Ho 3+ , 0.16Yb 3+ and cubic KSLF 0.03Ho 3+ , 0.16Yb 3+ was studied in detail. The UC emission spectra of the two phosphors with the increase of input power from 609.5 to 1170.4 mw under 980-nm excitation are recorded, as shown in Figure 6A,B There is a positive correlation between UC emission intensity (I) and the pump power (P) of the materials, which can be expressed by the following formula: I / P n , where n is the number of pumping photons absorbed by Ho 3+ ions in the process to the up-conversion.…”

“…A N is mainly related to the high‐wavenumber vibration in the crystal lattice, and this vibration depends on the phonon energy of the material. The maximum phonon energy in the monoclinic form is greater than that in the cubic form, and, so, more energy in the monoclinic form is transferred from the excited state of Ho 3+ ions to the surrounding environment without radiating photons, resulting in the higher luminous intensity of the cubic form than that of the monoclinic form 59,60 …”

A new melilite-type rare-earth borate CdTbGaB2O7 and multicolor tunable emission in the CdTb1−xSmxGaB2O7 (0 ≤ x ≤ 0.2) phosphors

“…[10][11][12] When active laser medium (such as Er 3+ , Nd 3+ or Pr 3+ ions) are doped into this crystal structure, the obtained crystals may show both luminescence and NLO properties, which makes them very attractive for the new generation of laser frequency converters, the representative crystals including Bi 2 ZnOB 2 O 6 :-Yb 3+ /Er 3+ , Bi 2 ZnOB 2 O 6 :Nd 3+ and Bi 2 ZnOB 2 O 6 :Pr 3+ . [13][14][15] In addition, not long ago, two new melilite-type borogermanates, Ca 2 GeB 2 O 7 and Ca 1.78 Cd 0.22 GeB 2 O 7 , were also reported, among which Ca 2 GeB 2 O 7 has a short UV cutoff edge (<200 nm), indicating its potential as an optical material in the UV or DUV region. 16 The compounds mentioned above are the only borates with melilite structure reported so far.…”

A new photocatalyst: triple heterojunction Yb3+-Bi2O3/BiOIO3 catalyst for mercury removal from flue gas

“…On the one hand, the radius of rare earth ions is close to that of Bi 3+ ions, and rare earth ions can easily enter Bi 2 O 3 by doping to replace Bi 3+ , making its lattice phase transition (Lei et doping concentration (0-40%), it can be observed that the morphology of Bi 2 O 3 changes from nano sheet to nano ower to nano ball, and the crystal phase also changes from monoclinic phase to tetragonal phase and nally to cubic phase. (Kasprowicz et al 2021). On the other hand, the stable valence state of rare earth ions is trivalent.…”