2results about How to "Excellent luminous properties" patented technology

The present application relates to the technical field of organic photoelectric material, in particular to a stretchable polymer based on diarylfluorene derivative and a preparation method and application thereof.The stretchable polymer based on diarylfluorene derivative has a structural unit as shown in formula (I), wherein R1 is selected from a fluorine-substituted alkyl chain with 4-20 carbon atoms, and R2 is selected from an alkyl chain or a fluorine-substituted alkyl chain with 4-20 carbon atoms.The present application designs and synthesizes a fluorene monomer substituted by diaryl at the 9th position by using 2,7-dibromofluorenone as raw material through Bayer-Villiger rearrangement and Grignard reaction, introduces a fluorine-substituted alkyl chain at the 4th position of the fluorene unit, effectively enhances the chain entanglement between polymers and constructs a crosslinked network structure, and provides a polymer with excellent flexibility, stretchability and stable photoelectric performance.

One aspect of the present application is a phosphor powder composed of Eu-containing α-Sialon phosphor particles. The volume-based median particle diameter (D 50 ) of the phosphor powder, measured using a laser diffraction scattering method, is 10 μm to 20 μm, and the diffuse reflectance for light having a wavelength of 600 nm is 93% to 99%.