Thermal functional Materials have wide applications in thermal management fields, and inserting highly thermal conductive materials is effective in enhancing thermal conductivity of matrix. In this paper, copper nanoparticles were selected as the additive to prepare polymethyl methacrylate (PMMA) based nanocomposite with enhanced thermal properties. Uniform copper nanoparticles with pure face-centered lattice were prepared by liquid phase reduction method. Then, they were added into PMMA/N, N-Dimethylmethanamide (DMF) solution according to the different mass fraction for uniform dispersion. After DMF was evaporated, Cu-PMMA nanocomposites were gained. The thermal analysis measurement results showed that the decomposition temperature of nanocomposites decreased gradually with the increasing particle loadings. The thermal conductivity of the Cu-PMMA nanocomposites rose with the increasing contents of copper nanoparticles. With a 20 vol.% addition, the thermal conductivity was up to 1.2 W/m · K, a 380.5% increase compared to the pure PMMA. The results demonstrate that copper nanoparticles have great potential in enhancing thermal transport properties of polymer.

A facile method to synthesis of CaWO4:Ln3+ nanocrystals and transparent CaWO4:Ln3+/polystyrene (PS) or polymethyl methacrylate (PMMA) copolymer films with outstanding luminescent property and high transparency is proposed. The average diameter of CaWO4:Ln3+ nanorods is 3.3 ± 3 nm, and the average length is 40.3 ± 20 nm. The as‐prepared CaWO4:Ln3+/PS or PMMA copolymer films with high solids loading (>5 vol%) exhibit excellent near‐ultraviolet absorption and outstanding visible transparency under the naked eye. The experiment results about the relationship between the solids loading and the film transparency are compared and analyzed. These optical results suggest that our nanorod has a versatile strategy for producing highly transparent functional luminescent composites, which indicates the promising applications in the field of optoelectronics in the future.

In recent years, white light emitting diodes (LEDs) as a typical green lighting source have attracted great attention. A promising red phosphor for LEDs, (Ba0.8Eu0.1Li0.1)2Gd0.67W1 − x Mo x O6 solid solution, was synthesized by a high-temperature solid-state reaction. The excitation spectra of phosphors can be broadened by substituting Mo for W, which has good absorption in the near ultraviolet region. We measured the X-ray diffraction, absorption spectra, excitation spectra and emission spectra of these solid solutions, and analyzed their crystal structures. This series of phosphors present a relatively effective excitation band in the near-UV region (370–425 nm) from the charge transfer state of MoO6 and orange-red luminescence at 596 nm from the 5D0 → 7F1 transition. With increasing molybdate content, the luminescence intensity of (Ba0.8Eu0.1Li0.1)2Gd0.67W1−x Mo x O6 (x = 0.15–0.6), increases first and then decreases, and reaches a maximum at x = 0.4. The red phosphor excited by near ultraviolet light provides a reference value for white LEDs.