Optically pumped lasing from vapor‐grown crystals of methoxy‐substituted thiophene/phenylene co‐oligomer

Mizuno, Hitoshi; Yanagi, Hisao; Sasaki, Fumio; Hotta, Shu

doi:10.1002/pssa.201200212

Cited by 13 publications

(8 citation statements)

References 22 publications

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“…As mentioned in the previous section, the platelet single crystals of TPCOs provide a 2D cavity in which the emitted light is confined inside and amplified under optical pumping, resulting in gain‐narrowed ASE . When the parallel side facets of the crystal function as Fabry–Pérot feedback mirrors, multimode laser oscillations arise in the ASE band . Besides this conventional lasing due to optical resonance in the cavity, there is another laser scheme based on stimulated Raman scattering (SRS) .…”

Section: Enhanced Raman Scattering From Single‐crystal Tpcosmentioning

confidence: 99%

Cooperative Behaviors in Amplified Emission from Single Microcrystals of Thiophene/Phenylene Co‐Oligomers toward Organic Polariton Laser

Yanagi

Sasaki

Yamashita

2019

Advanced Optical Materials

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After successful commercialization of organic light‐emitting diodes (OLEDs), organic semiconductor lasers have become a practical research target for versatile optoelectronic applications. Realization of electrically pumped lasing with molecular materials faces critical issues such as exciton quenching by injected carriers, nonradiative triplet states, and difficulties in introduction of resonators. One of potential routes to overcome them is to utilize polaritonic emission based on cooperative coupling of photons with excitons and/or phonons in molecular crystals. This report overviews cooperative behaviors observed in amplified emissions from single‐crystal thiophene/phenylene co‐oligomers (TPCOs) and discusses their expected potential toward organic polariton lasers. First, amplified emission accompanied with unusual time delay, spectral splitting, and fluence dependence of lasing threshold is presented, suggesting superfluorescence from macroscopically correlated molecular excitons, not based on the conventional stimulated emission process. Second, selectively enhanced Raman scattering under off‐resonant condition is shown, which is interpreted as a result of contribution of coherent vibrations in the TPCO crystals. Then, angle‐resolved spectroscopies demonstrate a stable existence of exciton polaritons at room temperature in microcavity devices with TPCO crystals. It is concluded that all those unique behaviors are ascribed to the TPCO excitons and vibrations having large oscillator strength under the uniaxially oriented molecular alignment.

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Section: Enhanced Raman Scattering From Single‐crystal Tpcosmentioning

confidence: 99%

Cooperative Behaviors in Amplified Emission from Single Microcrystals of Thiophene/Phenylene Co‐Oligomers toward Organic Polariton Laser

Yanagi

Sasaki

Yamashita

2019

Advanced Optical Materials

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“…This is known as the resonant condition :

nL = normalm λ

where n, L are the phase refractive index of crystal and round‐trip distance, respectively, and m (an integer) is the order of mode. Laser oscillations have been observed from many other TPCOs crystals with clean cleaved facets . These materials have high refractive index (more than 2.9 in crystals), according to the calculation of Yamao et al.…”

Section: Lasing Oscillation From Single Crystalsmentioning

confidence: 97%

Functional organic single crystals for solid-state laser applications

Fang

Yang

Feng

et al. 2014

Laser & Photonics Reviews

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170

132

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Because of long-range order and high chemical purity, organic crystals have exhibit unique properties and attracted a lot of interest for application in solid-state lasers. As optical gain materials, they exhibit high stimulated emission cross section and broad tunable wavelength emission as similar to their amorphous counterpart; moreover, high purity and high order give them superior properties such as low scattering trap densities, high thermal stability, as well as highly polarized emission. As electronic materials, they are potentially able to support high current densities, thus making it possible to realize current driven lasers. This paper mainly describes recent research progress in organic semiconductor laser crystals. The building molecules, crystal growth methods, as well as their stimulated emission characteristics related with crystal structures are introduced; in addition, the current state-of-the-art in the field of crystal laser devices is reviewed. Furthermore, recent advances of crystal lasers at the nanoscale and single crystal light-emitting transistors (LETs) are presented. Finally, an outlook and personal view is provided on the further developments of laser crystals and their applications.

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“…By the rotation of the polarizer, the EL spectra can be changed from orange to yellow-green and yellow. The polarized EL and tunable emission color from the BP3T-based OLEDs can be attributed to the large birefringence difference between a -axis and b -axis of the crystal induced by the uniaxially alignment of the BP3T molecules 42 43 44 45 46 . The two EL peaks at 575 and 635 nm observed in the TE and TM polarized spectra correspond to the resonance of TE and TM modes in the anisotropic microcavity, respectively 47 48 49 .…”

Section: Resultsmentioning

confidence: 99%

Intrinsic Polarization and Tunable Color of Electroluminescence from Organic Single Crystal-based Light-Emitting Devices

Ding

Feng

Zhou

et al. 2015

Sci Rep

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A single crystal-based organic light-emitting device (OLED) with intrinsically polarized and color-tunable electroluminescence (EL) has been demonstrated without any subsequent treatment. The polarization ratio of 5:1 for the transversal-electric (TE) and transversal-magnetic (TM) polarization at the emission peak of 575 nm, and 4.7:1 for the TM to TE polarization at the emission peak of 635 nm, respectively, have been obtained. The emitting color is tunable between yellow, yellow-green and orange by changing the polarization angle. The polarized EL and the polarization-induced color tunability can be attributed to the anisotropic microcavity formed by the BP3T crystal with uniaxial alignment of the molecules.

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Optically pumped lasing from vapor‐grown crystals of methoxy‐substituted thiophene/phenylene co‐oligomer

Cited by 13 publications

References 22 publications

Cooperative Behaviors in Amplified Emission from Single Microcrystals of Thiophene/Phenylene Co‐Oligomers toward Organic Polariton Laser

Cooperative Behaviors in Amplified Emission from Single Microcrystals of Thiophene/Phenylene Co‐Oligomers toward Organic Polariton Laser

Functional organic single crystals for solid-state laser applications

Intrinsic Polarization and Tunable Color of Electroluminescence from Organic Single Crystal-based Light-Emitting Devices

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