Multi-Band Emission of Pr-Doped CaAlO and the Effects of Charge Compensator Ions on Luminescence Properties.

Multi-band emission luminescence materials are of great significance owing to their extensive application in diverse fields. In this research, we successfully prepared a series of Pr-doped CaAlO multi-band emission phosphors via a high-temperature solid-state method. The phase structure, morphology, luminescence spectra and decay curves were investigated in detail.

Effect of a-SiCN:H Encapsulation on the Stability and Photoluminescence Property of CsPbBr Quantum Dots.

The effect of a-SiCN:H encapsulation layers, which are prepared using the very-high-frequency plasma-enhanced chemical vapor deposition (VHF-PECVD) technique with SiH, CH, and NH as the precursors, on the stability and photoluminescence of CsPbBr quantum dots (QDs) were investigated in this study. The results show that a-SiCxNy:H encapsulation layers containing a high N content of approximately 50% cause severe PL degradation of CsPbBr QDs. However, by reducing the N content in the a-SiCxNy:H layer, the PL degradation of CsPbBr QDs can be significantly minimized.

Triple-Mode Emissions with Invisible Near-Infrared After-Glow from Cr -Doped Zinc Aluminum Germanium Nanoparticles for Advanced Anti-Counterfeiting Applications.

Materials exhibiting persistent luminescence (PersL) have great prospect in optoelectronic and biomedical applications such as optical information storage, bio-imaging, and so on. Unfortunately, PersL materials with multimode emission properties have been rarely reported, although they are expected to be very desirable in multilevel anti-counterfeiting and encryption applications. Herein, Cr -doped zinc aluminum germanium (ZAG:Cr) nanoparticles exhibiting triple-mode emissions are designed and demonstrated.

Impacts of 5d electron binding energy and electron-phonon coupling on luminescence of Ce in LiY(BO).

In this work, the crystal structure and electronic structure as well as the synchrotron radiation vacuum ultraviolet-ultraviolet-visible (VUV-UV-vis) luminescence properties of LiY(BO) (LYBO):Ce phosphors were investigated in detail. The Rietveld refinement and DFT calculation reveal the 2/ monoclinic crystal phase and the direct band gap of the LYBO compound, respectively. Only one kind of Ce 4f-5d transition is resolved in terms of the low temperature VUV-UV excitation, UV-vis emission spectra and luminescence decay curves.

Site Occupancies, Luminescence, and Thermometric Properties of LiY(SiO)O:Ce Phosphors.

In this work, we report the tunable emission properties of Ce in an apatite-type LiY(SiO)O compound via adjusting the doping concentration or temperature. The occupancies of Ce ions at two different sites (Wyckoff 6h and 4f sites) in LiY(SiO)O have been determined by Rietveld refinements. Two kinds of Ce f-d transitions have been studied in detail and then assigned to certain sites.

Luminescence and X-ray absorption studies on 0.5% Ce(3+) doped BaCa2MgSi2O8 phosphor.

0.5% Ce(3+) doped BaCa2MgSi2O8 phosphor was prepared by a conventional solid state reaction method. Luminescence spectra as well as fluorescence decay were monitored in the VUV-UV range.

Luminescence and site occupancies of Eu3+ in La2CaB10O19.

Eu(3+)-activated La2CaB10O19 phosphors with nominal chemical formulae La(2-x)Eu(x)CaB10O19 and La2Ca(1-2x)Eu(x)Na(x)B10O19 were prepared. The luminescence properties under VUV-UV excitation were investigated. Luminescence spectra reveal Eu(3+) ions occupy both Ca(2+) and La(3+) sites in all samples.

Enhanced emission of Mn2+ via Ce3+ → Mn2+ energy transfer in α-Sr2P2O7.

Mn(2+) doped and Ce(3+)-Mn(2+) co-doped α-Sr(2)P(2)O(7) phosphors were prepared by a traditional high-temperature solid-state reaction route. The UV-vis excitation and emission spectra for all samples were investigated. Luminescence of Mn(2+) is assigned to from two different sites, which is similar to that of Ce(3+).

Unusual method for phenolic hydroxyl bridged lanthanide CPs: syntheses, characterization, one and two photon luminescence.

A "basophilic method" for phenolic hydroxyl bridged lanthanide coordination polymers (CPs) was developed. With this method, eleven CPs with the general formula of [Ln(HL1)L1·H(2)O](n) (Ln = Tb (1), Nd (2), Eu (3), Gd (4), La (5), Er (6), Y (7), H(2)L1 = 4-methyl salicylic acid) and [Ln(HL2)L2·2MeOH](n) (Ln = Eu (8), Tb (9), Gd (10), La (11), H(2)L2 = 3-hydroxy-2-naphthoic acid) were synthesized based on two ligands, and five of them (1-4 and 8) were characterised by X-ray single crystal diffraction. The powder X-ray diffraction patterns (PXRD) of complexes showed that 1-7 are isostructural, 8-11 are isostructural.

Intensive green emission of ZnAl2O4:Mn2+ under vacuum ultraviolet and low-voltage cathode ray excitation.

A series of Zn(1-x)Mn(x)Al(2)O(4) (x=0.001∼0.08) phosphors were synthesized by a traditional solid-state reaction route.

Bright green-emitting, energy transfer and quantum cutting of Ba3Ln(PO4)3: Tb3+ (Ln = La, Gd) under VUV-UV excitation.

Tb3+ doped Ba3Gd(PO4)3 and Ba3La(PO4)3 phosphors were synthesized using the traditional high temperature solid state reaction method. The excitation, emission, and decay spectra were measured at room temperature. Efficient energy transfer (ET) from Gd3+ to Tb3+ exists in Tb3+ doped Ba3Gd(PO4)3, and the ET efficiency increases with the increase of Tb3+ concentration.