Organic Nanostructured Host–Guest Materials Containing Three Dyes

Botta, Chiara; Patrinoiu, Greta; Picouet, Pierre; Yunus, Sami; Communal, JE; Cordella, Fabrizio; Quochi, Francesco; Mura, Andrea; Bongiovanni, Giovanni; Pasini, Mariacecilia; Destri, Silvia; Silvestro, Giuseppe Di

doi:10.1002/adma.200400200

Cited by 44 publications

(48 citation statements)

References 23 publications

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“…[13] Other possible strategies to suppress intermolecular interactions by supramolecular host-guest organization are the inclusion of the active molecules in inorganic or organic channel-forming host materials. [14] While formation of interchain species is more likely in the solid state and in concentrated solutions, [15] we find that even in dilute aqueous solutions of aromatic unthreaded chains the photoluminescence decay displays longlived components and is both non-exponential and strongly dependent on concentration. Concomitant with a red-shifted time-integrated emission, these are optical signatures of interchain species.…”

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confidence: 97%

Control of Rapid Formation of Interchain Excited States in Sugar‐Threaded Supramolecular Wires

et al. 2008

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mentioning

confidence: 97%

Control of Rapid Formation of Interchain Excited States in Sugar‐Threaded Supramolecular Wires

et al. 2008

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“…The control of energy transfer to the multiple components for multicolored luminescence is also difficult. [1,10] However, mesophase thin films incorporated with Eu …”

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confidence: 99%

Full‐Color Mesophase Silicate Thin Film Phosphors Incorporated with Rare Earth Ions and Photosensitizers

2007

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Many studies have been performed recently in an attempt to produce full-color phosphors, [1][2][3] especially those with white color emissions, [4] due to their important role in the field of display systems and lighting technologies. Various colors can be achieved by adjusting the relative red, green and blue luminescent components. Thus, full-color phosphors could be obtained by controlling the relative amounts of these components to achieve multicolored photoluminescence. The sharp and intense line-emissions of rare earth (RE) complexes have been of great interest in the luminescence material science field. [1,5] In the RE complex, an organic ligand is employed as an energy absorption antenna to photosensitize the RE ion in the center of the complex. The trivalent RE ion absorbing the energy can exhibit a highly efficient and narrow emission via an effective intermolecular energy transfer from the ligand to the luminescent center. [6] In addition, some ligands like salycilic acid show strong blue emission under UV excitation. This suggests that some organic ligands can serve as blue components in addition to being photosensitizers. Among RE complexes, trivalent europium (Eu) and terbium (Tb) ions exhibit bright red and green emissions when they are linked to a suitable ligand. Therefore, Eu and Tb complexes accompanied by excess blue light emitting ligands can be co-doped and served as red, green, blue luminescent components for multicolored photoluminescence. The color can be controlled by changing the composition of the RE ions and the photosensitizers which affect the energy transfer to the various components resulting in a full-color phosphor. Recently, Wada et al. reported the multicolored photoluminescence of zeolite powders incorporated with Tb 3+ and Eu 3+ ions and photosensitizers exhibiting red-green-blue (RGB) photoluminescence.[1] The color was finely tuned by changing the composition of the RE ions and the photosensitizers, the temperature, and the excitation wavelength. However, a white color was only observed at a temperature of 77 K. In this paper, we present mesophase silicate thin films incorporated with RE ions and organic ligands that successfully exhibit multicolored photoluminescence including white at room temperature. The use of ordered mesophase silicate thin film as a matrix material in which to incorporate photoactive molecules is attracting increasing interest. [7][8][9] In the present study, RE complexes are incorporated into films of this type. The luminescent dopants can easily be incorporated into nano-sized mesopores to obtain homogeneous thin films. The rigid inorganic framework, which can protect the dopants in the silicate mesophase matrix, can improve the stability of the RE complexes. Also, the advantages of using the silicate mesophase matrix to incorporate the complexes include the local separation of organic/inorganic regions, the prevention of dopant aggregation, the chemical inertness and the controllable porosity of the silicate framework.[9] Furthermore, the hydrop...

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“…The addition of a small amount of the third dye quinquethiophene, or T5, emitting in the yellow-green region allows transfer of energy from the NUV to nearly the whole visible spectrum (see Figure 5) through a two-step resonant energy-transfer process. [15] The [10] 0.82 [10] 0.63 [10] DPB 280-350 350-450 0.46/0.12,0.7 ns 0.37/0.18,0.7 ns 0.42/0.6 ns [a, 26] 0.12 DPH 320-390 400-500 0.85/2.5 ns 0.65 [15] /4 ns [15] 0.65/13 ns [a, 26] 0.03/ < 0.5 ns…”

Section: Dca Host-guest Thin Filmsmentioning

confidence: 97%

“…[28] To extend from the blue to the whole visible the range of the emission of DCA ICs, we inserted two or three dyes in the DCA host. Co-ICs of DPH and P3 in DCA show emission from the DPH chromophore when P3 is excited (see Figure 5), which indicates that in the DCA host crystal, similarly to the PHTP crystal, [4,15] efficient resonant energy transfer shifts the emission far from the absorption region. The high PL QY (0.90) obtained for P3:DPH-DCA with 80:20 dye molar ratio shows that NUV light (absorbed by the P3 dye) is converted to the blue (emission of the DPH dye) without loss of energy.…”

Section: Dca Host-guest Thin Filmsmentioning

confidence: 99%

“…Through a proper choice of the dyes, their absorption-emission properties can be easily tuned and selfabsorption processes avoided. We have shown that by inserting two or three dyes in the channels of the PHTP host, materials able to convert energy from the UV to the visible with efficiencies as high as 100 % can be obtained [15] as a result of the highly efficient resonant energy-transfer processes that occur among the guest molecules, [4] whose spatial and geometrical organization is imposed by the host. These systems are therefore ideal materials for energy conversion to be used as colour-changing media for light-emitting diodes, as light harvesters for solar cells or sensitizers for UV detectors.…”

Section: Introductionmentioning

confidence: 99%

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Highly Emissive Nanostructured Thin Films of Organic Host–Guests for Energy Conversion

et al. 2009

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All-organic nanostructured host-guest systems, based on dyes inserted in the nanochannels of perhydrotriphenylene (PHTP) and deoxycholic acid (DCA), show enhanced fluorescence properties with quantum yields even higher than those of the dyes in solution, thanks to the high concentration of emissive molecules with controlled spatial and geometrical organization that prevents aggregation quenching. Both host molecules crystallize, growing with the long axis oriented along the direction of the nanochannels where the linear-chain dyes are inserted, to yield crystals emitting well-polarized light. For the DCA-based host-guests, homogeneous thin films suitable for several applications are obtained. Colour emission in such films can be tuned by co-inclusion of two or three dyes due to resonant energy-transfer processes. We show that films obtained by low-cost techniques, such as solution casting and spin-coating, convert UV light into visible light with an efficiency much higher than that of the standard polymeric blends.

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Organic Nanostructured Host–Guest Materials Containing Three Dyes

Cited by 44 publications

References 23 publications

Control of Rapid Formation of Interchain Excited States in Sugar‐Threaded Supramolecular Wires

Control of Rapid Formation of Interchain Excited States in Sugar‐Threaded Supramolecular Wires

Full‐Color Mesophase Silicate Thin Film Phosphors Incorporated with Rare Earth Ions and Photosensitizers

Highly Emissive Nanostructured Thin Films of Organic Host–Guests for Energy Conversion

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