The Systhesis And Optoelectronic Properties Of The Linear And Cross-Conjugated Compounds Based On Anthracene Center

Luminescent materials throughout the history of human civilization all the time. It is widely used in telecommunications, satellite, radar, display, high-tech field recording, optical computers, biomolecular probes particular. Especially, it is fast developed on these luminescent materials to meet different disply requrements in our informative age. Luminescent materials can be divided into two kinds of inorganic luminescent materials and organic luminescent materials. Compared with inorganic materials, organic materials having a higher luminous efficiency and a wider choice of emission colors, and having easy superiority of large-area film formation. In recent years, organic light-emitting materials research increasingly attract interest of organic light-emitting area, including photoluminescence, electroluminescence, chemiluminescence, bioluminescence, etc. In this paper,we synthesized two types organic molecules based on anthracene center discussed the relationship between their molecular structure and photophysical properties.Cruciform 2,6-bis(p-dibutylaminostyryl)-9,10-bis(4-pyridylvinyl-2) anthracene (DAB) is a donoreacceptor-containing two-dimensionally cross-conjugated luminogen exhibiting the aggregation-enhanced emission effect, here we report its one- and two-photon absorption and fluorescence properties in different solvents and its solid-state piezofluorochromism. It is found that DAB exhibits strong solvatochromic effect and its two-photon absorption cross sections are solvent-dependent. The maximal two-photon absorption cross sections values measured in dichloromethane, tetrahydrofuran, and toluene solutions are 670,1840, and 2030 GM, respectively. Piezofluorochromic experiment shows that the fluorescence color and emission spectrum of DAB solid could be changed reversibly between red (617 nm) and deep red (654 nm) emissions upon pressing and annealing. Powder wide-angle X-ray diffraction and differential scanning calorimetric analyses reveal that the Piezofluorochromic behavior is caused by the external stimuli-induced phase transformation between crystalline and amorphous states.We synthesized three N-phenylcarbazole-capped 9,10-divinylanthrane isomers by Changing the linking positions of N-phenylcarbazole,9,10-bis(N-phenylcarbazol-2-/3-yl-vinyl-2)anthracenes(CZ2/CZ3), and 9,10-bis(4-(carbazol-9-yl)styryl)anthracene (CZ9) to examine isomeric effects on the fluorescence and electroluminescence properties. The results showed that their fluorescence emission properties in both crystalline and amorphous states were affected by the linking position of N-phenylcarbazole. The three isomers were all strong crystallization-enhanced emission (CEE) dyes, whereas the strongest and the weakest fluorescence efficiencies were measured in crystalline and amorphous states of CZ9, respectively. When the isomers were used as bulk emitting layers by vapor deposition, the maximal luminous efficiency, luminance, and the turn-on voltage of CZ9-based device were 0.10 cd/A, 550 cd/cm2, and 7.8 V, respectively. In sharp contrast, CZ3 afforded the best EL performance, and the corresponding performances were 3.1 cd/A,13770 cd/cm2, and 3.2 V, respectively. The obvious isomeric effect indicated that subtle manipulation of peripheral groups was indeed a feasible and efficient way for tuning the optical and optoelectronic properties of CEE dyes.