Lasing from Epitaxially Oriented Needle Crystals of a Thiophene/Phenylene Co‐Oligomer

Abstract

Optically pumped lasing of epitaxially oriented molecular crystals is presented. Needle-like crystals of a thiophene/phenylene co-oligomer is grown along the [110] direction of a KCl substrate. The fluorescence light is one-dimensionally confined and amplified by the self-waveguiding effect in the elongated needles. The Fabry-Pérot resonation by the terminated ends results in laser oscillations corresponding to the needle length.

Refractive Index Measurements of Well-Defined Polygon Crystals of Thiophene/Phenylene Co-Oligomers

“…These observations mean that the BP2T-OMe and BP2T crystals are potentially useful for laser media. 27,35) The present studies are expected to provide important information for the design of organic lasers.…”

Organic Light-Emitting Diodes with Heterojunction of Thiophene/Phenylene Co-Oligomer Derivatives

“…needle-like crystals by epitaxial growth. 8 Moreover, spectrally narrowed emission has been reported for a lightemitting field-effect transistor (FET) with a single-crystal TPCO under AC-gate operation, 9 demonstrating a potentials of TPCOs for electrically pumped lasing.…”

Fabry–Pérot modes and optical waveguide effects in individual thiophene/phenylene co-oligomer nanoneedle crystals

“…12 Yanagi et al have reported TPCO epitaxially crystallized in oriented needles grown on cleaved (001) surfaces of potassium chloride (KCl) single crystals using the hot-wall epitaxy method. [13][14][15] Noteworthy optical properties such as a selfwaveguided feature, stimulated resonance Raman scattering, 16 and lasing 17 have been observed in the needles. The lasing of TPCO crystals has been demonstrated in microdisk structures, occurring in whispering gallery modes (WGMs).…”