[摘要]：Bismuth embedded Y zeolites were studied by using UV-vis-near infrared (NIR) diffuse reflectance, Raman, and steady-state NIR photoluminescence spectroscopy. The results suggest that Bi-5(3+) and Bi+ active centers coexist in the dehydrated and hydrated zeolite framework, both of which contribute to NIR emission. Furthermore, it was revealed that the high-temperature annealing leads to the formation of Bi2O3 clusters, which act as blocks for selectively closing down the "n-out windows" of H2O and O-2 molecules in the zeolites. It is believed that these materials can find a wide array of applications as active media of broadly tunable micro or nano-optical sources. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3496460]
