NO 2À sensing is closely associated with human health, and we adopted lanthanide Eu 3 + post-modified MOF as NO 2 À fluorescent probes. Typical stable MOF with uncoordinated carboxylic groups in the framework were chosen to encapsulate Eu 3 + . NO 2 À could generate an obvious quenching response to the fluorescence intensity. This Eu 3 + functionalized MOF exhibited excellent fluorescence performances and obvious quenching response to NO 2 À based on the energy transfer between Eu 3 + and NO 2 À . This MOF based NO 2 À fluorescent probe showed a highly splendid detection selectivity and sensitivity with a very low detection limit of 0.69 μM, which was significantly below the maximal level limits of NO 2 À in drinking water set by the WHO.

In this work, two types of chromophore i.e. the pyrromethene and perylene families dyes were doped into elastic polymeric host materials based on polydimethylsiloxane (PDMS), which had been widely employed in various applications. The solubilities, spectroscopic and laser properties of these dyes doped into PDMS matrices were systematically investigated. Tunable laser output with high conversion efficiencies and low laser thresholds were observed and calcu-* Dr. W. Lin E-Mail: linwx@zstu.edu.cn [a] Zhejiang Provincial