A blue light-emitting composition and an organic electroluminescent device and a display device containing the same

Abstract

The present invention discloses a blue light-emitting composition and an organic electroluminescent device and a display device containing the same. The blue light-emitting composition includes a compound with a general structural formula as shown in Formula I, and a compound with a general structural formula as shown in Formula II. The present invention introduces a fluorene or heterofluorene fragment, especially a dibenzofuran fragment, into both the host and guest materials, which can improve the electron transport properties of the host and guest materials, and the fragment on the guest material has a cycloalkyl structure, which increases the distance between the host and the guest, thereby reducing concentration quenching, and the cycloalkyl structure increases the steric hindrance during the aggregation process of the host and guest materials in the film, which is beneficial to limit the free rotation of the single bonds connecting the fragments on the host and guest materials to a certain extent, which is beneficial to reduce the non-radiative transition of solid molecules in the film, increase the radiation probability of the composite exciton, and can significantly improve the performance of the organic electroluminescent device in terms of driving voltage, external quantum efficiency and life. I, II

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