Thermal Enhanced Near-Infrared Upconversion Luminescence in YMoO:Yb/Nd with Uniaxial Negative Thermal Expansion.

Thermal quenching (TQ) of luminescence presents a significant barrier to the effective use of optical thermometers in high-temperature applications. Herein, we report a novel uniaxial negative thermal expansion (NTE) phosphor, YMoO:Yb,Nd, synthesized by a solid-state reaction. Under 980 nm laser excitation, it exhibits excellent thermally enhanced near-infrared (NIR) upconversion luminescence (UCL) performance.

Simultaneously tuning the luminescent color and realizing an optical temperature sensor by negative thermal expansion in Sc(WO):Tb/Eu phosphors.

At present, many researchers are focusing on trivalent lanthanide (Ln)-doped thermally enhanced upconversion luminescent (UCL) materials with negative thermal expansion (NTE) properties. However, selective anti-thermal quenching downshifting emissions of the activator and thermal quenching of the sensitizer in a phosphor with NTE properties are not implemented. Herein, Tb/Eu co-doped Sc(WO) phosphors synthesized by the solid-state method are explored in selectively enhanced red emission (Eu:D → F) due to the energy-transfer efficiency from Tb to Eu and the promoted radiative transition probability.

Lithium Polyacrylate as Lithium and Carbon Source in the Synthesis of Li VO for High-Rate and Long-Life Li-Ion Batteries.

Li VO is a promising anode material for use in lithium-ion batteries, however, the conventional synthesis methods for Li VO anodes involve the separate use of lithium and carbon sources, resulting in inefficient contact and low crystalline quality. Herein, lithium polyacrylate (LiPAA) was utilized as a dual-functional source and an in-situ polymerization followed by a spray-drying method was employed to synthesize Li VO . LiPAA serves a dual purpose, acting as both a lithium source to improve the crystal process and a carbon source to confine the particle size within a desired volume during high-temperature treatment.

Simultaneous Thermal Enhancement of Upconversion and Downshifting Luminescence by Negative Thermal Expansion in Nonhygroscopic ZrSc(WO)PO:Yb/Er Phosphors.

Thermal quenching (TQ) is still a critical challenge for lanthanide (Ln)-doped luminescent materials. Herein, we report the novel negative thermal expansion nonhygroscopic phosphor ZrSc(WO)PO:Yb/Er. Upon excitation with a 980 nm laser, a simultaneous thermal enhancement is realized on upconversion (UC) and downshifting (DS) emissions from room temperature to 573 K.