Synthesis and characterization of methoxy- or cyano-substituted thiophene/phenylene co-oligomers for lasing application

Abstract

As new candidates of thiophene/phenylene co-oligomer (TPCO) species, methoxy- or cyano-substituted compounds were synthesized for lasing applications.

Design and synthesis of new luminescent coordination networks of sql topology showing the highest degrees of interpenetration

“…2. 45,46 Intermolecular interaction analysis does not show π-π stacking but only C-H⋯O and C-H⋯N short contacts.…”

Optically pumped lasing in a single crystal cavity of thiophene/phenylene co-oligomers grown via improved crystal growth methods in solution

“…1,2) Lasing has been observed for a variety of solid organic materials. [3][4][5][6][7][8][9][10][11][12][13][14] As organic laser media, single crystals are ideal compared with polycrystalline or amorphous states because their highly aligned and densely packed molecular orientation results in high carrier mobilities, high waveguide efficiencies, and highly efficient stimulated emissions (SEs). [15][16][17][18] Moreover, lasing has been observed for various organic single crystals even without introducing external cavities.…”

“…Lasing in Fabry-Pérot (F-P) mode or whispering gallery mode (WGM) has been achieved with the self-cavity effect via naturally formed crystal facets. [3][4][5][6][7][8][9][12][13][14] Among a variety of organic light-emissive compounds, thiophene/ phenylene co-oligomers (TPCOs) are promising laser media owing to their superior carrier transport characteristics, 18) refractive indexes, 4,19,20) and photoluminescence (PL) quantum efficiencies. 21) In addition to conventional lasing based on SE, unique lasing behaviors have been observed from TPCO single crystals, suggesting the contribution of superfluorescence (SF) or polariton lasing even at room temperature.…”

“…These values are high enough for organic laser media compared with other organic singlecrystal laser media. 4,7) The lasing characteristics for BP4T crystals grown via the drop-casting method are shown in Fig. 4.…”

Laser oscillation of an organic distributed-feedback laser at the edge of a mini stopband

“…Mean period Λ of the diffraction gratings was 138 ± 5 nm, and the mean depth was 9.5 ± 2.3 nm. A single crystal of 5,5″-bis(biphenyl-4-yl)-2,2′:5′,2″-terthiophene (BP3T), one of the thiophene phenylene co-oligomers, which is considered to be a promising material for injection laser, [19][20][21][22][23][24][25][26] was used as an active layer. BP3T crystals with various thicknesses were simultaneously grown using the physical vapor-transport method under an argon-gas flow using BP3T, which was purchased from Luminescence Technology Corp. A BP3T single crystal was attached to a substrate with a diffraction grating so that the a-axis of the crystal could be aligned along the grating direction.…”