title: Thermoluminescence and a new organic light-emitting diode (OLED) based on triplet-triplet fluorescence of the trimethylenemethane (TMM) biradical.
abstract: The results of an investigation of the thermoluminescence (TL) and electroluminescence (EL) of arylated methylenecyclopropanes 1, systems whose photoinduced electron-transfer (PET) chemistry has been thoroughly studied, are described. In both the TL and EL experiments with 1, electronically excited triplet trimethylenemethane (TMM) biradicals (3)2** are generated by back electron transfer (charge recombination) of a TMM radical cation (hole) 2*+, formed by isomerization of the substrate radical cation (hole, 1*+). The application of this chemistry to the design of new organic light-emitting diodes (OLEDs) is described. The mechanistic features of this reaction system have the potential of overcoming significant problems (e.g., quantum efficiency, difficulty obtaining long wavelength emission, and device durability) normally associated with OLEDs that rely on the use of organic closed-shell hydrocarbons.
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.
authors.forename: Hayato
authors.initials: H
authors.lastname: Namai
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ikeda
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Hoshi
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Kato
authors.forename: Yoshii
authors.initials: Y
authors.lastname: Morishita
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Mizuno
mesh_terms: D005453:Fluorescence; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D005609:Free Radicals / Q000737:chemistry*; D005720:Gamma Rays; D007202:Indicators and Reagents; D049449:Luminescence; D009682:Magnetic Resonance Spectroscopy; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet
chemical_list: D005456:Fluorescent Dyes; D005609:Free Radicals; D007202:Indicators and Reagents