Study on preparation and fluorescence characteristic of coordinated Eu2O3/polymer hybrid films

Synthesis of CaWO4:Ln3+ nanocomposites with high transparency via ligand‐assisted re‐precipitation method

“…On the other hand, to decrease the particle size distinguishably under the visible light wavelength is the other feasible method. If [((𝑛 p ∕𝑛 m ) 2 − 1)∕((𝑛 p ∕𝑛 m ) 2 + 2)] 2 is a weak function dependent on the wavelength, the irradiance scattered by a small sphere compared with the wavelength or, indeed, any sufficiently small particle regardless of its shape, we have: 𝐼 s ∝ 1∕𝜆 4 . Generally, the inorganic particles ought to have a diameter below 10 nm, because the existence of an amount percentage of particles or clusters larger than 0.1 μm will bring about strong light scattering within the visible wavelength, then lead to haze or even feculence.…”

“…Recently, metal tungstates have undergone many thorough investigations and are used in various fields such as X‐ray intensified screen, lasers, light‐emitting diodes (LED), and scintillator materials 1,2 . Among them, calcium tungstate is a self‐activated blue‐emitting luminescence material, and its luminescence properties could be altered by doping with rare earth ions 3–5 . CaWO 4 is a prototype of heavy‐metal metal tungsten family, which has potential application in various fields.…”

Preparation of electrospun luminescent polyimide/europium nanofibers by simultaneous in situ sol–gel and imidization processes

“…7 F 4 transitions (711 nm) blue-shifted compared to that in the Eu 2 O 3 (see Fig. 1s in Supporting information [19]), which is possibly due to the different contributions of the 5 D 0 -7 F 2 (611 nm) transitions in various materials. In addition, the emission from the nanofibers was broader than that from pure Eu 2 O 3, which can be attributed to the heterogeneous broadening caused by a more disordered local environment surrounding the Eu 3+ ion [13].…”

“…7 F 3 (650 nm), and 5 D 0 ? 7 F 4 (706 nm) [19]. In the PI/europium nanofibers, 5 D 0 -7 F 2 transitions (615 nm) and 5 D 0 ?…”

“…In other words, the size and morphology of europium phase can be effectively controlled by choosing the appropriate europium concentration in the starting solution for electrospinning [19]. The hydrolysis extent of europium sol was controlled by the amount of water available, which was released through urea hydrolysis and the formation of PAA [23,36].…”