title: Synthesis of fluorescent C2-bridged teraryls and quateraryls for blue, sky-blue, and green color light-emitting devices.
abstract: A series of fluorescent teraryls and quateraryls were prepared from a ketene-S,S-acetal under mild conditions. These compounds exhibited blue, sky-blue and green color emissions both in the solid state and in a solution with good quantum yields, positive solvatochromic behavior, and reversible oxidation and reduction properties. The electronic characteristics of teraryl 6a and quateraryls 9a,b were examined by time-dependent density functional theory (TDDFT) calculations. Light-emitting devices were fabricated from teraryl 6a and quateraryls 9a,b as dyes and the configuration of ITO/PEDOT:PSS (40 nm)/NPB (20 nm)/ dye (50 nm)/BCP (7 nm)/ LiF (0.7 nm)/Al (200 nm), which exhibited electroluminescence maxima of 455, 480, and 525 nm, respectively. These devices operated at a substantially low turn-on voltage (3 and 4 V) and exhibited maximum luminance efficiencies of 0.62, 0.57, and 1.9 cd/A and brightnesses of 59, 160, and 1284 cd/m(2), respectively.
authors.affiliation: Medicinal and Process Chemistry Division and ‡Molecular and Structural Biology Division, CSIR-Central Drug Research Institute , Lucknow 226031, India.
authors.forename: Atul
authors.initials: A
authors.lastname: Goel
authors.forename: Ashutosh
authors.initials: A
authors.lastname: Sharma
authors.forename: Madhu
authors.initials: M
authors.lastname: Rawat
authors.forename: R S
authors.initials: RS
authors.lastname: Anand
authors.forename: Ruchir
authors.initials: R
authors.lastname: Kant
mesh_terms: D000080:Acetals / Q000737:chemistry*; D004581:Electronics; D005456:Fluorescent Dyes / Q000138:chemical synthesis* / Q000737:chemistry; D007659:Ketones / Q000737:chemistry; D008027:Light; D049408:Luminescent Agents / Q000138:chemical synthesis* / Q000737:chemistry; D015394:Molecular Structure; D011789:Quantum Theory
chemical_list: D000080:Acetals; D005456:Fluorescent Dyes; D007659:Ketones; D049408:Luminescent Agents