| Metal-organic frameworks?MOFs?have become a research hotspot,owing to their potential applications in gas storage,selective adsorption and separation of gases/vapors,optics,drug delivery,catalysis and so on.Among that,optical functional MOFs have received considerable attention.Their luminescent performance can be adjusted by changing organic ligands and metal nodes.In addition,the guest luminophores accommodated into the cavities can further improve and modulate the optical properties of MOFs.Many optical functional MOFs have been reported and show potential in fields such as luminescent sensors,photocatalysis,non-linear optics,biomedical imaging and so on.In this paper,selecting luminescent ligands and using the mixed ligands strategy,we have designed and synthesized stable porous luminescent MOFs.We introduced lanthanides or luminophores to constructed MOFs composites through post-processing to realize tunable luminescence.MOFs composites can be used as chemical sensor to detect aromatic compounds.In addition,based on the trichromatic theory,white light materials can be obtained by encapsulating luminophores with complementary colors into porous luminescent MOFs and used in white light emitting diodes?WLEDs?.1.A stable porous carbazole-based MOF,NENU-522,was successfully constructed.It is extremely stable in air and acidic/basic aqueous solutions,which provides conditions for encapsulating Ln3+ ions for tunable luminescence emission.More importantly,white light can be realized by adjusting rations of Eu3+and Tb3+ions.Additionally,Tb3+@NENU-522 can be as fluorescent indicator for the qualitative and quantitative detection of nitroaromatic explosives with different numbers of-NO2 groups,and the concentrations of complete quenching are about 2000,1000,and 80 ppm for nitrobenzene,1,3-dinitrobenzene,and2,4,6,-trinitrophenol,respectively.Meanwhile,Tb3+@NENU-522 sensor displays high selectivity and recyclability.[Zn4O?L?3?H2O?2]3[Zn4O?L?3]·xDMF?NENU-522?H2L = 9H-carbazole-3,6-dicarboxylic acid2.NENU-519,a luminescent MOF with zeolite BCT topology was successfully synthesized.It is a rare example of a two-fold interpenetrated framework with zeolite topology.NENU-519 demonstrates the ability of selectively adsorbing cationic dyes.Furthermore,we developed Rh6@NENU-519?Rh6 = Rhodamine 6G?as a dual-emitting sensor using the emission peak height ratios of L to dye as detectable signals.The composite can distinguish the isomers of o-,m-,and p-xylene and ethylbenzene due to energy transferbetween L and dye.Moreover,Rh6@NENU-519 can serve as a luminescent switch to detect different aromatic compounds,like benzene,benzene substituted with different groups,and pyridine.[?CH3?2NH2]2[?Zn2O?L]·5DMF?NENU-519?H4L = tetrakis[4-?carboxyphenyl?oxamethyl]methane acid3.A stable mesoporous blue-emitting MOF,NENU-521,was successfully constructed.NENU-521 can serve as a host for encapsulating Alq3 to obtain tunable and efficient white-light emission.The Alq3@NENU-521 composite possesses excellent stability and can be used as a promising white phosphor in WLEDs.[?Zn4O?3?TPA?4?TDA?3?H2O?6][?Zn4O??TPA?2]2·12DMF?NENU-521?H2TDA = thiophene-2,5-dicarboxylic acidH3TPA = 4,4',4''-nitrilotribenzoic acid4.We successfully synthesized a novel anionic luminescent MOF?NENU-524?with lonsdaleite topology,containing {Zn8?btca?6?2-NH2-bdc?3} trigonal prismatic units that can be regarded as double secondary building units.NENU-524 has permanent porosity and excellent stability in air.NENU-524 was used to encapsulate yellow-emitting [Ir?ppy?2?bpy?]+via an ion-exchange process.The [Ir?ppy?2?bpy?]+@NENU-524?[Ir?ppy?2?bpy?]+: 3.86 wt%?emitted pure white light with CIE coordinates of?0.300,0.336?and high quantum yield of15.2%.The WLED assembled can emit bright white light,and continued emitting bright white light for up to one month.[?CH3?2NH2]2[Zn8?btca?6?2-NH2-bdc?3]·8DMF?NENU-524?H2btca = benzotriazole-5-carboxylic acid2-NH2-H2 bdc = 2-amino-1,4-benzenedicarboxylic acid... |
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