Tetraphenylpyrene-Bridged Periodic Mesostructured Organosilica Films with Efficient Visible-Light Emission

Abstract

Mesostructured organosilica films with strong blue fluorescence emission were synthesized by surfactant-templated sol-gel polycondensation using a 1,3,6,8-tetraphenylpyrene (TPPy)-containing organosilane precursor. The TPPy precursor, which contained four polymerizable silyl groups, was suitable for the preparation of mesostructured films with high TPPy content in the framework. The fluorescence quantum yields of the TPPy-bridged mesostructured organosilica films reached more than 0.7, despite the dense accumulation of TPPy units within the framework. Doping of the mesostructured films with fluorescence dyes enabled fine-tuning of the emission colors over a wide range of the visible spectrum. Such mesostructured organosilica films, in which different chromophores can be distributed into the framework and mesopores, have significant potential for luminescence applications.

Optical Properties of Hybrid Organic‐Inorganic Materials and their Applications

“…Later on, more efficient WLEDs were reported involving silsesquioxane hybrid matrices, as, for example, that based on the phenylenevinylenediimide precursor, luminance value of 10 cd·m −2 for voltages lower than 30 V, [12] and that based on polyhedral oligomeric silsesquioxanes bearing in the structure a dye molecule from the cyanine family, threshold operating voltage of 4 V. [63] An intriguing example is the fabrication of a WLEDs by coating a commercial UV LED (390 nm) with a periodic mesoporous organosilica (PMO) film doped with Rhodamine 6G (Rh6G) and synthesized by surfactant-templated sol-gel polycondensation using a 1,3,6,8-tetraphenylpyrene (TPPy)-containing organosilane precursor. [13] The blue emission of the films, emission quantum yield of 0.70, overlaps the Figure 3. Photographs of A) red and green dye-bridged oligosiloxanes under UV excitation at 365 nm and B) dye-bridged nanohybrid-based white LED, CIE color coordinates of (0.348, 0.334), fabricated encapsulating a blue LED (445 nm) with a blend of red and green dyes.…”

“…The first examples of the use of hybrid materials in lighting (more specifically in solid-state lighting, SSL) appeared in 2001 with layered crystalline organic-inorganic perovskites. [8] Although the interest on these hybrid perovskites as single-phase white light emitters continue, [9,10] the wide range of materials with potential application in SSL would include dye-bridged, [11][12][13][14][15][16][17] dyedoped [18] and quantum dots-doped [19] siloxane-based organicinorganic hybrids, and metal organic frameworks. [20] Despite the interest of organic-inorganic hybrid perovskites in lighting, the most exciting application of these materials is in solar cells.…”

Light‐Harvesting Hybrid Assemblies

“…Perfect-white-light-emitting PMOs could also be achieved by using tetraphenyl pyrene (TPPy) organosilane precursors and rhodamine 6G (Rhd6 G) acceptor molecules ( Figure 7 c and d). [27] The flexibility of loading the acceptor dyes in the mesochannels and the possibility to incorporate a wide range of organic chromophore bridges into the walls helps to produce a variety of luminescent PMOs with tunable energy transfer and emission color. Furthermore, PMOs can also be made as highly transparent films, which would avoid the loss of luminescence efficiency due to scattering and hence more suitable for the fabrication of LEDs, although processability is a concern here as well.…”

Preparation of copper (II) ion-containing bisimidazolium ionic liquid bridged periodic mesoporous organosilica and the catalytic decomposition of cyclohexyl hydroperoxide

“…These characteristics make PMOs showing potential application in catalysis [9,[12][13][14]. Since the reports of PMOs in 1999 [15][16][17], various organic species have been introduced into the pore walls of PMOs [18].…”