title: The origin of a 650 nm photoluminescence band in rubrene.
abstract: Commonly observed variations in photoluminescence (PL) spectra of crystalline organic semiconductors, including the appearance or enhancement of certain PL bands, are shown to originate from a small amount of structural disorder (e.g., amorphous inclusions embedded in a crystal), rather than be necessarily related to chemical impurities or material oxidation. For instance, in rubrene, a minute amount of such disorder can lead to the appearance of a dominant PL band at 650 nm as a result of triplet excitons captured and fused at these sites, with a subsequent emission from the amorphous phase.
authors: Department of Physics and Astronomy Rutgers University, Piscataway, NJ 08854, USA.
authors: Yuanzhen
authors: Y
authors: Chen
authors: Bumsu
authors: B
authors: Lee
authors: Danni
authors: D
authors: Fu
authors: Vitaly
authors: V
authors: Podzorov
mesh_terms: D004553:Electric Conductivity; D008163:Luminescent Measurements; D009279:Naphthacenes / Q000737:chemistry*; D011791:Quartz / Q000737:chemistry; D012666:Semiconductors
chemical_list: D009279:Naphthacenes; D011791:Quartz; C045049:rubrene