In this article, we propose a facile method for synthesis of K 2 SiF 6 :Mn 4+ phosphor and discuss its promising application in warm-white light emitting diodes (LED
RF2:Bi (R = Ca and Sr) phosphors were synthesized by solid state reaction method in air and their luminescence properties were investigated. Broad yellow-to-orange emissions peaking at ~550 nm (CaF2:Bi) and ~600 nm (SrF2:Bi) were observed under ~260 nm excitation. The emission centers inRF2:Bi (R = Ca and Sr) phosphors are Bi2+ ions, and the excitation and emission bands of RF2:Bi (R = Ca and Sr) phosphors can be attributed to 2P 1/2 → 2S 1/2 and 2P 3/2(1) → 2P 1/2 transitions of Bi2+ ions, respectively. The phosphors are promising for application in lighting due to broad yellow-to-orange emission.
Advancement of the synthetic performance of photocatalysts in environmental applications has been the most clinging pursue in relevant research fields. In this article, we propose a novel design strategy of an efficient visible-light photocatalyst with versatile advantages for environmental remediation. Flexible SiO 2 nanofibers were prepared with sol-gel and electrospinning techniques, followed by uniform anchoring of Bi 2 WO 6 nanoplatelets on the fibers' surface, forming unique hierarchical SiO 2 -BiWO 6 composite fibers. Benefitting from the combination of the advantages from both the SiO 2 nanofibers and the Bi 2 WO 6 nanoplatelets, the film composed of SiO 2 -Bi 2 WO 6 fibers simultaneously possess high visible-light photocatalytic reactivity, good flexibility, and excellent thermal stability, affording many potential applications especially in environmental remediation. Water purification performance of the SiO 2 -Bi 2 WO 6 fibers film was evaluated here as an application example, and the results demonstrated are intriguing.
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