Multiple Charge Transfer Bands Induced Broad Excitation Eu Red Emission in a Vanadium Phosphate System for White Light-Emitting Diodes.

In order to realize broad excitation and narrow emission red light phosphor, a new vanadium phosphate BaBiVPO was selected as a host for Eu. Monitored at 619 nm, a wide band from 240 to 400 nm could be observed and inferred to be composed of Eu-O and V-O charge transfer bands, which could make it match well with the UV chip and the blue chip along with the characteristic excitation of Eu at 465 nm. Under 354 nm excitation, the sample could emit high color purity red light, and the thermal quenching integral intensity showed good thermal stability.

MgGdSiO:Ce, Mn: A Dual-Excitation Temperature Sensor.

A novel apatite-based phosphor MgGdSiO[MgGd(SiO)O]:Ce, Mn was designed and successfully synthesized by a solid-state reaction. Based on the different luminescence properties under 298 and 340 nm excitations, its potential application as a dual-excitation luminescent ratiometric thermometer was studied in detail. Under the excitations of 298 and 340 nm, the fluorescent intensity ratio of Ce and Mn is linearly correlated in the temperature range of 303-473 K.

Novel narrow-band blue light-emitting phosphor of Eu-activated silicate used for WLEDs.

Owing to the broad application scope of phosphors for light and display, the development of narrow-band light-emitting phosphors has recently gained considerable research attention. In this study, a new type of narrow-band blue light-emitting phosphor, RbHfSiO:Eu, with a full width at half maximum (FWHM) of 64 nm was synthesized successfully. Upon the near visible ultraviolet (NUV) light excitation, the internal quantum efficiency of RbHfSiO:Eu was 68%.

A Highly Selective Turn-on and Reversible Fluorescent Chemosensor for Al Detection Based on Novel Salicylidene Schiff Base-Terminated PEG in Pure Aqueous Solution.

The development of highly selective and sensitive chemosensors for Al detection in pure aqueous solution is still a significant challenge. In this work, a novel water-soluble polymer PEGBAB based on salicylidene Schiff base has been designed and synthesized as a turn-on fluorescent chemosensor for the detection of Al in 100% aqueous solution. PEGBAB exhibited high sensitivity and selectivity to Al over other competitive metal ions with the detection limit as low as 4.

A simple turn-on fluorescent chemosensor based on Schiff base-terminated water-soluble polymer for selective detection of Al in 100% aqueous solution.

A simple water-soluble polymer PEGBHB based on polyethylene glycol bearing a Schiff base derivative moiety was successfully designed and synthesized. PEGBHB showed high selectivity and sensitivity towards Al as a turn-on fluorescent chemosensor without influence by other competitive metal ions in 100% aqueous solution. The detection limit of PEGBHB for Al was found to be 9.

A dual chemosensor for Cu and Hg based on a rhodamine-terminated water-soluble polymer in 100% aqueous solution.

A novel water-soluble polymer bearing a rhodamine receptor (PEGSRh) was synthesized as a dual chemosensor for the recognition of Cu2+ and Hg2+ in 100% aqueous solution. PEGSRh not only exhibited a sensitive colorimetric response towards Cu2+ and Hg2+ but also showed a selective turn-on fluorescence response towards Hg2+ over other metal ions. The binding stoichiometry for the complexation of PEGSRh with Cu2+ and Hg2+ was confirmed to be 1 : 1 by Job plot analysis.

Bis(chloro-acetato-κO,O')bis-(2-fluoro-benzyl-κC)tin(IV).

In the title complex, [Sn(C(2)H(2)ClO(2))(2)(C(7)H(6)F)(2)], the Sn(IV) atom is located on a twofold rotation axis and forms a strongly distorted trans-octa-hedral geometry. The equatorial plane is defined by two chelating chloro-acetate ligands with asymmetrical Sn-O bond lengths, while the axial positions are occupied by the C atoms of two 2-fluoro-benzyl groups. In the crystal, infinite chains in the [010] direction are formed through inter-molecular Sn⋯O inter-actions [Sn⋯O separation = 3.

Bis(4-fluoro-benz-yl-κC)bis-(3-methyl-sulfanyl-1,2,4-thia-diazole-5-thiol-ato-κN,S)tin(IV).

The mononuclear title molecule, [Sn(C(7)H(6)F)(2)(C(3)H(3)N(2)S(3))(2)], has 2 symmetry. The Sn(IV) atom, located on a twofold rotation axis, is in a skew trapezoidal-bipyramidal geometry, with the basal plane defined by two S,N-chelating 3-methyl-sulfanyl-1,2,4-thia-diazole-5-thiol-ate ligands. The apical positions are occupied by the C atoms of two 4-fluoro-benzyl groups.