101 research outputs found
Intrinsic deep hole trap levels in with self-consistent repulsive Coulomb energy
The large error of the DFT+U method on full-filled shell metal oxides is due
to the residue of self-energy from the localized d orbitals of cations and p
orbitals of the anions. U parameters are self-consistently found to achieve the
analytical self-energy cancellation. The improved band structures based on
relaxed lattices of are shown based on minimization of self-energy
error. The experimentally reported intrinsic p-type trap levels are contributed
by both Cu-vacancy and the O-interstitial defects in . The latter
defect has the lowest formation energy but contributes a deep hole trap level
while the Cu-vacancy has higher energy cost but acting as a shallow acceptor.
Both present single-particle levels spread over nearby the valence band edge,
consistent to the trend of defects transition levels. By this calculation
approach, we also elucidated the entanglement of strong p-d orbital coupling to
unravel the screened Coulomb potential of fully filled shells.Comment: 5 pages, 1 table, 4 figures (minor revision, byline, table reformat,
figure 3 caption update
Broadband NIR photon upconversion generates NIR persistent luminescence for bioimaging
Upconversion persistent luminescence (UCPL) phosphors that can be directly
charged by near-infrared (NIR) light have gained considerable attention due to
their promising applications ranging from photonics to biomedicine. However,
current lanthanide-based UCPL phosphors show small absorption cross-sections
and low upconversion charging efficiency. The development of UCPL phosphors
faces challenges of lacking flexible upconversion charging pathways and poor
design flexibility. Herein, we discovered a new lattice defect-mediated
broadband photon upconversion process and the accompanied NIR-to-NIR UCPL in
Cr-doped zinc gallate nanoparticles. The zinc gallate nanoparticles can be
directly activated by broadband NIR light in the 700-1000 nm range to produce
persistent luminescence at about 700 nm, which is also readily enhanced by
rationally tailoring the lattice defects in the phosphors. This proposed UCPL
phosphors achieved a signal-to-background ratio of over 200 in bioimaging by
efficiently avoiding interference from autofluorescence and light scattering.
Our findings reported the lattice defect-mediated photon upconversion for the
first time, which significantly expanded the horizons for the flexible design
of NIR-to-NIR UCPL phosphors toward broad applications
In Situ Reconstruction of High‐Entropy Heterostructure Catalysts for Stable Oxygen Evolution Electrocatalysis under Industrial Conditions
info:eu-repo/semantics/publishedVersio
Unraveling the correlation between oxide-ion motion and upconversion luminescence in bLa2Mo2O9:Yb3+,Er3+ derivatives
The upconversion emission of Er3+ in β-La2(Mo,W)2O9 can reveal the short-range thermally-driven jumps and long-range motion of oxide-ions.</p
Cu and Fe oxides dispersed on SBA-15:a Fenton type bimetallic catalyst for N,N-diethyl-p-phenyl diamine degradation
A bimetallic oxidation catalyst has been synthesized via wet impregnation of copper and iron over a mesoporous SBA-15 silica support. Physicochemical properties of the resulting material were characterized by XRD, N2 physisorption, DRUVS, FTIR, Raman, SEM and HRTEM, revealing the structural integrity of the parent SBA-15, and presence of highly dispersed Cu and Fe species present as CuO and Fe2O3. The CuFe/SBA-15 bimetallic catalyst was subsequently utilized for the oxidative degradation of N,N-diethyl-p-phenyl diamine (DPD) employing a H2O2 oxidant in aqueous solution
Expert Consensus on Microtransplant for Acute Myeloid Leukemia in Elderly Patients -Report From the International Microtransplant Interest Group
Recent studies have shown that microtransplant (MST) could improve outcome of patients with elderly acute myeloid leukemia (EAML). To further standardize the MST therapy and improve outcomes in EAML patients, based on analysis of the literature on MST, especially MST with EAML from January 1st, 2011 to November 30th, 2022, the International Microtransplant Interest Group provides recommendations and considerations for MST in the treatment of EAML. Four major issues related to MST for treating EAML were addressed: therapeutic principle of MST (1), candidates for MST (2), induction chemotherapy regimens (3), and post-remission therapy based on MST (4). Others included donor screening, infusion of donor cells, laboratory examinations, and complications of treatment
- …