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The luminescent properties of Bi activated M 5 (PO 4 ) 3 Cl (M = Ca, Sr and Ba) prepared under the air and mild reducing conditions (5% H 2 and 95% N 2 ) were investigated. Results show that all samples present ultraviolet (UV) emissions of Bi 3+ besides Ba 5 (PO 4 ) 3 Cl prepared in reducing condition, which also shows broadband...
We theoretically investigate negative refraction in finite one-dimensional photonic crystals and discuss the dependence of negative refraction on the crystal structure, the incident angle and the background medium systematically. We find that negative refraction phenomena exist in many structures if we choose the incident angle carefully. We also find that when the crystal structure and the background...
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