Abstract: The present disclosure relates to a plurality of host materials comprising a first host material comprising a compound represented by formula 1, and a second host material comprising a compound represented by formula 2, and an organic electroluminescent device comprising the same. By comprising a specific combination of compounds as host materials, it is possible to provide an organic electroluminescent device having lower driving voltage, higher luminous efficiency, higher power efficiency, and/or superior lifespan characteristics compared to conventional organic electroluminescent devices.

Abstract: The present invention relates to a fucoidan-based theragnostic composition, and more particularly, to preparation and use of a theragnostic composition which uses a conjugate of a fluorescent dye or a photosensitizer and fucoidan, thereby not only allowing for fluorescence imaging diagnosis of lesions for cancer or vascular diseases but also allowing a therapeutic effect thereon to be obtained at the same time. The conjugate obtained by covalent bonding of a fluorescent dye or a photosensitizer and fucoidan, according to the present invention, is not only useful for fluorescence imaging diagnosis of tumor tissues and ophthalmic vascular diseases, but also may exhibit a therapeutic effect on cancer cells and coronary artery smooth muscle cells, and a neovascularization inhibitory effect in ophthalmic diseases.