409093-91-0Relevant academic research and scientific papers
Synthesis and properties of blue-light-emitting Oligo(fluorene-co-dibenzothiophene-S,S-dioxide)s
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An effective synthetic route for preparation of oligo(fluorene-co- dibenzothiophene-S,S-dioxide)s (trimer SOF2, pentamer SOF4, heptamer SOF6 and nonamer SOF8) based on meta- or para-linked dibenzothiophene-S,S-dioxide (SO) unit as the core was developed by convergence method, for which the intermediates unilateral boric acid esters were prepared by one-step palladium-catalysed Suzuki cross-coupling reaction. The resulting oligomers exhibited excellent thermal stability with thermal decomposition temperature exceeding 415 °C, and high photoluminescent quantum yield in the solid state (52–81%). The UV–vis absorption and photoluminescence emission maxima of the oligomers exhibited gradual bathochromic shifts from the trimer to the nonamer, approaching those of the previously reported polymer PFSO10 containing 10 mmol% of the SO unit in the polyfluorene backbone, demonstrating the similar photophysical properties of the nonamer SOF8 and polymer PFSO10. The highest occupied molecular orbital energy level gradually decreased and the lowest unoccupied molecular orbital energy level steadily increased from the trimer SOF2 to the nonamer SOF8. The obtained oligomers displayed pure blue-light emission with the maximal emission peaked at about 440 nm and superior EL spectral stability compared with PFSO10 upon varying the current density from 100 mA cm?2 to 500 mA cm?2, in addition to more balanced hole and electron fluxes. With the device configuration of ITO/PEDOT:PSS/oligomer/CsF/Al, a maximum luminous efficiency of 2.75 cd A?1 with Commission Internationale de l'Eclairage (CIE) coordinates of (0.16, 0.15) was obtained for the device based on 37SOF8. The efficiency increased by 88% compared with the device based on 37PFSO10 (1.46 cd A?1). A similar enhancement in efficiency was also achieved for the device based on 28SOF8. These results indicate that the obtained oligomers are very promising candidates for structurally well-defined blue-light- emitting materials with high efficiency and reproducibility.
Branched blue-fluorescence molecule, as well as preparation method and application thereof
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Paragraph 0068; 0069; 0070; 0071, (2018/09/21)
The invention discloses a branched blue-fluorescence molecule, as well as a preparation method and application thereof. According to the branching blue-fluorescence molecule, a core unit contains heteroatom-nitrogen, so that the fluorescence quantum yield and the carrier transmittability of a light-emitting material can be improved, and a light-emitting device favorably obtains high-efficient andstable light-emitting device performance; meanwhile, a fluorene unit is contained, so that the branched blue-fluorescence molecule has higher fluorescence quantum yield. The branched blue-fluorescencemolecule provided by the invention has a certain space structure, can effectively inhibit fluorescence quenching, has better solubility, can be dissolved by a common organic solvent, and forms a filmthrough spin coating and ink-jet printing or printing so as to be prepared into a light-emitting layer of a light-emitting diode.
A kind of star-shaped fluorescent molecule and its preparation method and application (by machine translation)
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Paragraph 0099; 0100; 0101; 0102, (2019/01/14)
The invention belongs to the field of organic photoelectric technology, discloses a star-shaped fluorescent molecule and its preparation method and application. The star-shaped fluorescent molecules of the following formula, Wherein Ar1 is or The star-shaped fluorescent molecular structure containing a hetero atom in the sulfur -, help to improve the fluorescence quantum yield, help to strengthen the fluorescent material, the photoelectric efficiency of the device is improved. And the electron deficient group - sulfone, can effectively reduce the LUMO energy level of the fluorescent material, is propitious to the electron injection, the turn-on voltage of the device is reduced; and the invention the star-type fluorescence molecule has relatively high molecular weight, can form a dense film, avoiding the light-emitting layer of a light emitting region of the pinhole defect, favorable to the preparation of excellent appearance of the electroluminescent device. Based on the star-shaped fluorescent molecules of the luminescent layer preparation polymer electroluminescent light-emitting device of simple process, has the potential to apply to the organic electroluminescent device in industrial production. (by machine translation)
A kind of star-shaped fluorescent molecule and its preparation method and application (by machine translation)
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Paragraph 0087-0090, (2019/01/08)
The invention belongs to the field of organic photoelectric technology, discloses a star-shaped fluorescent molecule and its preparation method and application. The invention star fluorescence molecule shown in the following formula: R1 For the C1 - 30 alkyl, C3 - 30 cycloalkyl, C6 - 60 aromatic hydrocarbyl or C7 - 60 aromatic heterocyclic radical. The invention also provides a method for the preparation of star-shaped fluorescent molecules and in organic electronic display in the field of application, is especially suitable for preparing light-emitting diode device of the luminescent layer. The invention star fluorescence molecule, fluorescence quantum yield of the luminescent material and the carrier transmission capacity, to obtain a high efficiency and stable performance of the device; has good thermal stability; space structure can effectively inhibit the fluorescence quenching; and relatively high molecular weight make it have good solubility, soluble in common organic solvent, suitable for solution processing and ink-jet printing, can form a dense film, to prepare the luminescent layer, favorable to the preparation of excellent appearance of the electroluminescent device. (by machine translation)
Blue oligomer based on dibenzothiophene-S,S-dioxide unit and preparation method and application of blue oligomer
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, (2017/03/08)
The invention discloses a blue oligomer based on a dibenzothiophene-S,S-dioxide unit and a preparation method and application of the blue oligomer. The blue oligomer is mainly characterized by comprising a fluorene structure unit and the dibenzothiophene-S,S-dioxide structure unit. The preparation method mainly comprises the step of preparation of the blue oligomer based on the dibenzothiophene-S,S-dioxide unit. Due to the fact that the electroluminescence efficiency and the spectral stability are improved by introducing the dibenzothiophene-S,S-dioxide structure unit into the oligomer, the novel oligomer blue-light emitting material is obtained. According to the obtained blue oligomer based on the dibenzothiophene-S,S-dioxide unit, an electroluminescence device prepared through film formation of a solution processing method is high in efficiency, good in spectral stability and suitable for being adopted as a light-emitting layer of a light-emitting diode and a flat-panel displayer.
