Abstract
Two oligomers with different molecular weight were produced. Fluorescence properties were examined both in solutions and in the solid state. In the solid state, molecular weight turned out to be an important factor influencing the aggregation structures and therefore the emission of the compounds, in colour and intensity. The neat compounds emit two different colours, blue and yellow, with increasing the molecular weight, whereas both compounds are blue emitters in solution and dispersed in host polymers. Dissolved in a LC host polymer and in a PVK matrix, they displayed noteworthy photoluminescence quantum yields.
Highlights
Traditional light-emitting devices are solid-state based consisting of a thin emissive polymer film sandwiched between anode and cathode [1,2,3,4]
Among them are electrochemiluminescent cells (ECLs) [5] with fluorescent dye-doped organic solvents as emissive layer, organic light-emitting diodes (OLEDs) [6] with a liquid host doped with a guest fluorophore, lightemitting electrochemical cells (LECs) [7, 8] where the emission is provided by a doped ionic liquid, and devices based on fluorophore-doped liquid crystal (LC) layers, giving polarized light emission [9,10,11,12]
E high degree of flexibility due to the nature of the emissive layers is the reason for the growing interest in lighting and photovoltaics, and in chemo- and biosensors [13], as well as in most modern exotic applications such as PDLC panels and displays, smart windows, and colour filter glasses [14]. e basic concept is the production of emissive flexible layers by dissolving or dispersing dye molecules in an organic host matrix [1, 5, 7,8,9,10,11,12, 15,16,17,18,19,20,21,22] such as highly mouldable polymers, liquid semiconductors [22], polymer-containing electrolytes [7, 8], ionic liquids [18, 19], and liquid crystal (LC)
Summary
Traditional light-emitting devices are solid-state based consisting of a thin emissive polymer film sandwiched between anode and cathode [1,2,3,4]. E fluorescence properties of the two oligomers were examined as neat solids, in solution and in addition to mouldable host matrixes. In the latter case, a remarkable PL performance was observed. Doped LC samples were obtained by dissolving NPh2 and NPh5 (1% by weight) and the commercial nematic LC polymer, using acetone as a solvent, removing the solvent at 100°C and deposing the mixture between quartz slides. Elemental analysis calculated (%) for C290H282 N10O50: C, 73.99; H, 6.04; N, 2.98; found: C, 74.01; H, 6.06; N, 3.00
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