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oe1(光电查) - 科学论文

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  • A bipolar deep blue-emitting fluorescent material based on imidazole and triphenylamine for efficient non-doped OLEDs

    摘要： A bipolar deep blue-emitting fluorescent material, 1-(4-tert-butyl phenyl)-2-[4-(N,N- diphenyl)phenyl]-4,5-diphenyl-1H-imidazole (TPA-PIM) has been designed and synthesized for efficient blue organic light-emitting diodes (OLEDs). The photophysical, thermal and electrochemical properties of TPA-PIM are investigated. TPA-PIM possesses high thermal stabilities with decomposition temperature of 396 °C and shows a strong deep-blue emission at 407 nm in N, N-dimethylformamide (DMF) solution. Single-carrier devices are fabricated to show that TPA-PIM has good bipolar characteristics. The non-doped fluorescent OLEDs using TPA-PIM as emitter exhibited stable and efficient deep-blue emissions with the CIE coordinates of (0.16, 0.09), the maximum luminance of 1392 cd m?2 and the maximum current efficiency of 2.60 cd A?1.

    关键词： Triphenylamine,Blue light-emitting materials,Bipolar materials,Imidazole,Non-doped OLEDs

    更新于2025-11-19 16:56:42

  • Efficient non-doped blue fluorescent OLEDs based on bipolar phenanthroimidazole-triphenylamine derivatives

    摘要： Blue organic emissive materials are still the most important bottlenecks for the development of organic light-emitting diodes (OLEDs). To enrich the material library, herin, three bipolar phenanthroimidazole derivatives, namely MePPIM-TPA, ClPPIM- TPA and BuPPIM-TPA, are synthesized using triphenylamine as electron-donor and phenanthroimidazole as the electron-acceptor. The photophysical, thermal and electrochemical properties of three compounds are investigated with high decomposition temperature up to 350 °C, and strong blue emission. Single-carrier devices are fabricated to show that three compounds have good bipolar carrier transport characteristic. The non-doped fluorescent OLEDs devices using three compounds as emitting layers are fabricated among which the devices based on MePPIM-TPA achieved the maximum luminance of 1743 cd/m2, the maximum external quantum efficiency (EQE) of 2.99% which is relatively comparable to commonly used blue emitters.

    关键词： Non-doped OLEDs,Bipolar characteristic,Triphenylamine,Fluorescent materials,Phenanthroimidazole

    更新于2025-09-23 15:19:57

  • Calix[4]resorcinarene-based Hyper-Structured Molecular Thermally Activated Delayed Fluorescence Yellow-Green Emitters for Non-doped OLEDs

    摘要： A novel hyper-structured molecular (HSM) thermally activated delayed fluorescent (TADF) emitters, in which the TADF units and host units are bound together into one inactive core through the flexible linkage, was designed. Phenoxazine-triphenyltriazine (PXZ-Trz), 1,3-bis(9H-carbazol-9-yl)benzene (mCP) and calix[4]resorcinarene (CRA) were chosed as TADF unit, host unit and core, respectively, a series of CRA-based HSM emitter, CRA-PXZ-Trz(X)-mCP(100-X). (x=0, 12.5, 25, 50, 75, 87.5 or 100) were succesfully synthesized by a two-step click reaction. Using non-doped CRA-PXZ-Trz(87.5)-mCP(12.5) as the light-emitting layer, the solotion-precessable OLEDs emitted yellow-green light, and dispiayed a external quantum efficiency of 16.7% at 100 cd/m2.

    关键词： Thermally activated delayed fluorescence,Solution-processable,Non-doped OLEDs,Calix[4]resorcinarene,Hyper-structured molecular

    更新于2025-09-19 17:13:59