Y2O2S:Yb3+, Er3+ nanofibers: novel fabrication technique, structure and up-conversion luminescent characteristics

(La0.97RE0.01Yb0.02)2O2S Nanophosphors Converted from Layered Hydroxyl Sulfate and Investigation of Upconversion Photoluminescence (RE=Ho, Er)

“…The Er 3+ electrons can thus be excited from the 4 I 15/2 ground state to the 4 I 11/2 level with the energy transferred from Yb 3+ (one photon, ET1). The absorption cross section of Er 3+ is smaller than that of Yb 3+ at ~ 980 nm [42, 45], so energy transfer (ET) dominates the real excitation of Er 3+ . The excitation energy at the 4 I 11/2 level may non-radiatively (NR) relax to the 4 I 13/2 level, from which the electrons can be excited to the 4 F 7/2 state by ET of a second laser photon (ET2).…”

Electrospinning fabrication and luminescence properties of Lu2O2S:Eu3+fibers

“…During the reaction process, the decomposition of PVP and nitrates leads to the fracture of the obtained fibers. 13,[29][30][31] The double-crucible method proposed here is actually a solid-gas reaction, which has been proven to be an important method, which can not only retain the morphology of Lu2O2:Eu 3+ fibers, but can also fabricate Lu2O2S:Eu 3+ fibers with a pure phase at relatively low temperature. Obviously, since the 4f energy levels of Eu 3+ are hardly affected by the crystal field because of the shielding effect of 5s 2 5p 6 electrons, there is no remarkable shift in the positions of the emission peaks in Lu2O2S:Eu 3+ samples compared with Lu2O3:Eu 3+ systems.…”

Metal Oxysulfides: From Bulk Compounds to Nanomaterials

“…The same strategy was used to yield Y 2 O 2 S:Er hollow nanofibers (Han et al, 2015b). With slightly different electrospinning parameters, full nanofibers of Y 2 O 2 S:Yb, Er with a diameter comprised between 80 and 140 nm were obtained and studied by Lu et al (2015).…”