Fe3O4 was prepared on the TiO2-coated natural mica substrate. The natural mica has an average particle size of 22 ㎛. The substrate was coated on TiO2 thin films using hydrothermal synthesis at pH 1.5-2.5 at 75℃. The Fe precursor solution was prepared by mixing FeSO4 (for Fe2+ ion) and FeCl3 (for Fe3+ ions) with different molar ratios such as 1/2, 1/1, 2/1, 3/0, and Fe3O4 only. X-ray diffraction analysis shows that the crystal structure depends on the FeCl3-to-FeSO4 molar ratio. Fe3O4 crystal phase could be obtained at higher FeSO4 contents.
Abstract: We focused on the development of red azo colorants with high thermal stability and good solubility for LCD color filter in this research. For the synthesis of hybrid azo colorants, we used the couplers of aniline. naphthol and benzoimidazol functional group. The synthesized hybrid azo colorants were charaterized by using NMR, UV/visihle spec troscopy, FT - JR. EA and 1`GA. They represented the maximum absorption wavelengths which are longer than 500 urn in UV/visible spectrum. So they were confirmed to be suitable for red colorants of LCD color filter. Azo compound (la, lh) with aniline functional group had good soluhility in organic solvents such as acetone, methanol, chloroform and PGMEA. Moreover azo compounds (ic, id and Ic) with naphthol and benzoimidazolone functional group gave excellent thermal stability higher than 250t in TGA thermograms.
Intermolecular interaction-controlled novel azo dyes for use in the high-performance color conversion layers of microdisplays Byung Kyu Jeon, Seong Hyun Jang, Se Hun Kim, Chun Yoon, Ji-Eun An, Dah Hee Kim, Woosung Lee, Byoung-Sun Lee, Jun Choi Optical Materials.2024; 147: 114676. CrossRef
Preparation of thermally stable dyes derived from diketopyrrolopyrrole pigment by polymerisation with polyisocyanate binder Chun Yoon, Hye‐Sun Kwon, Jae‐Sung Yoo, Hyun‐Young Lee, Ji‐Hye Bae, Jae‐Hong Choi Coloration Technology.2015; 131(1): 2. CrossRef
Synthesis and characterization of thermally stable dyes with improved optical properties for dye-based LCD color filters Jun Choi, Se Hun Kim, Woosung Lee, Chun Yoon, Jae Pil Kim New Journal of Chemistry.2012; 36(3): 812. CrossRef
The synthesis of thermally-stable red dyes for LCD color filters and analysis of their aggregation and spectral properties Chun Sakong, Young Do Kim, Jae-Hong Choi, Chun Yoon, Jae Pil Kim Dyes and Pigments.2011; 88(2): 166. CrossRef
Synthesis and characterization of novel blue azo‐dye derivatives containing acrylate group for dye‐based color filters Song Hak Kim, Chun Keun Jang, Sung Hoon Jeong, Jae Yun Jaung Journal of the Society for Information Display.2010; 18(11): 994. CrossRef
The synthesis and application of thermally stable dyes for ink-jet printed LCD color filters Young Do Kim, Jae Pil Kim, Oh Sang Kwon, In Hee Cho Dyes and Pigments.2009; 81(1): 45. CrossRef
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