We investigated gain and lasing in spin-coated films of a soluble substituted oligothiophene. With increasing excitation power, the photoluminescence spectra show a clear line narrowing due to amplified spontaneous emission. We measure a low threshold (20 J cm 2) for line narrowing and a large gain cross section (6×10 16 cm2), indicating that this molecule is a promising active material for organic solid-state lasers. As a demonstrator, we realize a transverse electromagnetic (TEM00) single-mode laser with tunable emission from the yellow to the red (a range of 37 nm), with a pump threshold as low as 18 J cm 2 and efficiency of 1.9%. These results are among the best so far reported for organic lasers.
|Autori:||D. PISIGNANO; M. ANNI; G. GIGLI; R. CINGOLANI; M. ZAVELANI-ROSSI; G. LANZANI; G. BARBARELLA; L. FAVARETTO|
|Titolo:||Amplified spontaneous emission and efficient tunable laser emission from a substituted thiophene-based oligomer|
|Anno del prodotto:||2002|
|Digital Object Identifier (DOI):||10.1063/1.1519735|
|Appare nelle tipologie:||1.1 Articolo in rivista|