Electrospun rhodamine@MOF/polymer luminescent fibers with a quantum yield of over 90%

Abstract

Summary Tailored luminescent guest@metal-organic framework (Guest@MOF) materials with outstanding photophysical properties are enabling materials for emergent technologies in smart sensors and optoelectronics. However, the practical utility of Guest@MOF currently is impaired by its poor stability and difficult-to-handle powder form. Here, we combine a luminescent-sensing Guest@MOF system with a non-luminescent polymer matrix and, for the first time, demonstrated the easy-to-apply electrospinning of luminescent fibers comprising nanocrystals of RhB@ZIF-71 (rhodamine B@zeolitic imidazolate framework-71) homogeneously dispersed in a polyvinylidene difluoride (PVDF) matrix. The luminescence of RhB@ZIF-71/PVDF fiber is tunable and exhibits a quantum yield exceeding 90%. Compared with RhB fluorophore in PVDF fiber, the ZIF-71 (host) protects the nanoconfined RhB guest molecules (especially the J-aggregates of RhB), giving the composite fiber its unique thermofluorochromic response and enhanced thermal stability to 200°C. Our results reveal the exciting opportunities for implementing electrospun luminescent fibers functionalized with bespoke Guest@MOF nanocrystals for multifunctional device applications.

Turn-On Fluorescence Chemical Sensing through Transformation of Self-Trapped Exciton States at Room Temperature

“…The decrease in quantum yields (QYs, Table S3 ) and excimer lifetime (τ 4 , Table S2 and Figure S4 ) when the perylene amount increases also supports the proposed structure as the enhanced interactions will increase the non-radiative decay. 26 , 30 …”

“…The decrease in quantum yields (QYs, Table S3) and excimer lifetime (τ 4 , Table S2 and Figure S4) when the perylene amount increases also supports the proposed structure as the enhanced interactions will increase the nonradiative decay. 26,30 BTX Sensing Performance of Perylene@MIL-68(In). Subsequently, we tested the BTX sensing properties of the perylene@MIL-68(In) system.…”

“…Because of their porous, ordered, and highly adjustable crystalline structures, metal–organic frameworks (MOFs) are believed to be one of the most promising materials to combine with perylene to yield tunable luminescent sensing properties. − In principle, the pores/channels of the MOF “host” can be used to encapsulate and isolate perylene “guest” molecules to overcome the ACQ effect, and when confined within an MOF structure, the solubility of perylene is no longer a concern . Of note, the emerging concept of the confinement of a luminescent guest (LG) in an MOF host, conferring an “LG@MOF” composite system, has huge potential for designing and engineering unconventional turn-on type luminescent sensors and lighting devices …”

Acridine based metal–organic framework host–guest featuring efficient photoelectrochemical-type photodetector and white LED

“…[6][7][8][9][10][11][12][13][14][15][16][17][18][19] During the past decade, a variety of guest-encapsulated MOF systems (Guest@MOFs) and luminescent MOF materials (LMOFs) have also been extensively studied owing to their facile synthesis routes and promising candidates for optoelectronic and photonic applications. [20][21][22][23][24][25][26][27][28][29][30] The LMOFs and Guest@MOFs can be modulated by the richness of metal ions/clusters and organic compounds as linkers. Given their high crystallinity and porous structure with a precise cavity size (typically ca.…”

Environmentally Benign Biosynthesis of Hierarchical MOF/Bacterial Cellulose Composite Sponge for Nerve Agent Protection

“…[6] Polymeric fibers with good processability can be integrated rationally with MOFs to yield materials with enhanced practicality and functionality. At present, MOFs have been successfully deposited onto both natural fibers including cotton [7] and silk [8] as well as synthetic fibers such as polyurethane, [9] polyethylene terephthalate, [10] polyamide, [11] polyacrylonitrile, [12] polystyrene, [12a, 13] polyvinylidene difluoride, [14] and polypropylene. [15] The prepared MOF/fiber composites possess integrated properties and performances which cannot be obtained from the individual components.…”