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Benzo[ghi]perylene & Coronene as Ratiometric Reversible Optical Oxygen Nano-Sensor
摘要： The development of novel single molecular probe based optical ratiometric oxygen sensor with simple fabrication, high sensitivity, and linear response is highly desirable. Herein, benzo[ghi]perylene (BzP) and coronene (Cron) were explored as dual-emissive ratiometric oxygen nano-sensor that displayed linear plots at a low probe concentration (6 μM). The sensor fabrication was simple, and the probes exhibited efficient fluorescence quenching of monomer emission by molecular oxygen. However, the excimer emission of probe remained unaffected. Thus a ratiometric method is developed based on the dual emitting luminophore. The method can be used to estimate dissolved oxygen in liquids and 5 – 100 % of oxygen concentration in gaseous mixtures.
关键词： Coronene,Benzo[ghi]perylene,Oxygen sensing,Excimer emission,Ratiometric sensor,Fluorescence probe
更新于2025-11-14 17:04:02
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Selective fluorescence sensing of H <sub/>2</sub> PO <sub/>4</sub><sup>a??</sup> by the anion induced formation of self-assembled supramolecular polymers
摘要： The utilization of anions to induce the formation of self-assembled supramolecular polymers in solution is an undeveloped area of host–guest chemistry. We report in this manuscript a comparative study of two tripodal anion receptors by hydrogen or halogen bonding interactions to form self-assembled supramolecular structures induced by the presence of anions. DOSY NMR and DLS experiments provided evidence for the formation of supramolecular structures in solution in both halogen and hydrogen bond donors with H2PO4? anions. The nucleation and elongation constants obtained using the thermodynamic model indicate that the polymers grow following an isodesmic mechanism. Emission studies demonstrate that only the formation of the supramolecular polymer between the halogen bond donor receptor and H2PO4? anions results in the appearance of the excimer emission band.
关键词： halogen bonding,hydrogen bonding,DLS,anion receptors,DOSY NMR,excimer emission,supramolecular polymers
更新于2025-09-19 17:13:59
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Decrease of intermolecular interactions for less-doped efficient deep blue monomer light-emitting diodes
摘要： Intermolecular interactions arise from molecular aggregation and cause concentration quenching and excimer emission. Although aggregation or excimer induced emission are sometimes favored, for example for color tuning, intermolecular interactions should usually be minimized because concentration quenching and excimer emission usually result in poor efficiency and color instability. In this paper, two novel tert-butyl modified naphthyl derivates, 4,5'-di-{[N,N,N',N'- tetrakis-(4-tert-butyl-phenyl)]phenyl-1'',4'''-diamine}-1,1'-binaphthalenyl (BN5) and 1,5-di-{[N,N,N', N'-tetrakis-(4-tert-butyl-phenyl)]phenyl-1'',4'''-diamine}-3,7-bi-tertbutylnaphthalenyl (BN6), have been synthesized and their intriguing photophysical properties and high-efficiency deep-blue electroluminescence (EL) in less-concentrated condensed phase investigated. Electroluminescent devices based on BN5 in 50% matrix achieved a high external quantum efficiency (EQE) of 3.7% and the Commission Internationale de L’Eclairage (CIE) coordinates of (0.160, 0.081) which is very close to the National Television Standards Committee’s (NTSC of USA) pure blue standard. Meanwhile, the non-doped device based on BN5 demonstrated a much higher EQE of 4.5%. Neat BN6-based device presented a pure monomer emission (λpeak = 420 nm) with an extremely high EQE of 5.1% and a satisfactory CIE coordinate of (0.171, 0.076). Such values are the best ever reported for 420 nm EL emission with an un-doped layer. We attributed the enhanced performance of deep blue monomer light-emitting diodes to tert-butyl groups of BNs due to a reduction of intermolecular interaction, especially the tert-butyl substituents on the molecular backbone of BN6 play a major role in inhibiting dimer and crystallization-induced emission.
关键词： excimer emission,organic light-emitting diodes,deep blue,intermolecular interactions
更新于2025-09-11 14:15:04