Red-emitting YVO4:Eu nanophosphors for agricultural luminescent converting films: synthesis and properties

Chúng tôi vui mừng thông báo rằng TS. Trịnh Dũng Chinh và các đồng nghiệp đã xuất bản công trình có tựa đề "Red-emitting YVO4:Eu nanophosphors for agricultural luminescent converting films: synthesis and properties" trên tạp chí Journal of Nanoparticle Research. 

Tóm tắt:

Red-emitting YVO4:Eu³⁺ nanophosphors were synthesized and experimentally fabricated into functional luminescent converting films. A comparative study revealed that the use of trisodium citrate produced nanoparticles with improved crystallinity and enhanced optical properties, whereas smaller, quasi-spherical nanoparticles (20–45 nm) were formed using polyethylene glycol (PEG). Nanophosphor morphology was found to be dependent on the surfactant. Results of X-ray diffractometer have shown the usage of nanophosphors crystallized in the tetragonal YVO₄ structure in the synthesis. Particularly, citrate-assisted nanophosphors exhibited strong red emission centered at ~ 615–618 nm (⁵D₀ → ⁷F₂ transition of Eu³⁺ ion) and longer average lifetime of 1.002 ms, compared to 0.706 ms for the PEG-assisted. A luminescent paste was formulated, and a formation mechanism involving physisorption and polymer bridging was introduced, based on results from Fourier transform infrared spectroscopy and Molecular Dynamics simulations. Experimentally fabricated on glass substrates, films (400–600 nm at thickness range) showed effective spectral conversion by absorbing UV radiation and then emitting in the photosynthetically active red region. These results demonstrate their potential for application in agricultural luminescent converting films.