Energy Dispersions of Anisotropic Refractive Indices of Thiophene/Phenylene Co-Oligomer Crystals

Bando, Kiyoshi; Kumeta, Shohei; Sasaki, Fumio; Hotta, Shu

doi:10.7567/jjap.50.101603

Cited by 11 publications

(11 citation statements)

References 32 publications

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“…Exciton coupling is usually much larger within the layers than between the layers, so that arrangements B and D (i.e., without invariance under translation) lead to partial depolarization . The optical anisotropy has been demonstrated for a number of crystals by polarized measurements …”

Section: Light Managementmentioning

confidence: 99%

Organic Single Crystal Lasers: A Materials View

Gierschner

Varghese

Park

2015

Advanced Optical Materials

221

254

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Materials design has become a vigorous aspect for organic solid‐state lasing, which often lacks a fundamental understanding of structure–property relationships. The development of such an understanding is undertaken in this progress report, which systematically explores the now‐available libraries of organic single crystals exhibiting light amplification under optical pumping. By doing so, intra‐ and intermolecular contributions are disentangled for the non‐/occurrence, type, threshold, wavelength, and polarization of the light amplification processes, opening the path to targeted materials design.

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Section: Light Managementmentioning

confidence: 99%

Organic Single Crystal Lasers: A Materials View

Gierschner

Varghese

Park

2015

Advanced Optical Materials

221

254

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“…This feature produces the high reflectance on crystal facets of either end and is responsible for the attainment of laser oscillation. Bando et al proposed another useful method to determine the dispersion of anisotropic refractive indices of organic crystals on the basis of their transmission spectra.…”

Section: Optical Constants and Their Dispersionmentioning

confidence: 99%

Optically and electrically excited emissions from organic semiconducting oligomer crystals

Hotta

2016

Polymer International

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This paper reviews optically and electrically excited emissions from organic semiconducting oligomers in the form of their single crystals. Of the semiconducting oligomers, the review focuses on thiophene/phenylene co-oligomers (TPCOs). The topics cover crystal growth and laser oscillation along with related spectrally narrowed emissions of TPCO crystals. Aside from the strong excitation with a laser beam, weak excitation using a mercury lamp produces optical fringes superimposed on broadband emission spectra. The laser oscillation spectra accompanied by longitudinal multimode and optical fringes observed from the weak excitation have the same origin. This enables us to determine optical constants (i.e. refractive indices) and their dispersion of the crystals and provides sufficient information for the construction of optoelectronic devices based on the organic crystals. As a typical example, the review outlines the improved device constitution and performance as well as device operation methods with light-emitting field-effect transistors (LEFETs), because the device configuration is suited for cutting-edge devices including lasers. Finally the review presents device performance of LEFETs having a diffraction grating. These devices are suited for exploring the possibility of constructing a next-generation current-injected laser device.

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“…from 585 to 470 nm), was calculated from the variation of

Δ \tilde{v}

. The dispersion is small, varying from 2.1 to 2.2, since it is rather far from the absorption region . It should be noted that our measurements do not allow for a higher accuracy of n g due to the limited instrumental resolution (ca.…”

mentioning

confidence: 99%

“…This is most likely due to thermal expansion of the resonator cavity under intense laser excitation for inducing stimulated emission. [17a] Inserting d = 83 μm, the group refractive index of the crystal at 484 nm was determined as n g = 2.2. The individual spectral lines have a line width (FWHM) of

δ \tilde{v}

= 17 cm −1 (peak at 20690 cm −1 ), from which a quality factor for the resonator structure of Q = (λ LO ·

δ \tilde{v}

) −1 = 1.2·10 3 is derived.…”

mentioning

confidence: 99%

“…In fact, the reported values agree fairly well with former reports on anisotropic molecular crystals. [17a] The optical anisotropy of the crystal is reflected in the polarization dependence of the laser emission. For the outgoing beam, the polarization dependence is significant, with a dichroic emission ratio of D em = I ∥ /I ⊥ = 21 due to the perpendicular orientation of TDM 01 against the basal facet (i.e.…”

mentioning

confidence: 99%

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Orthogonal Resonator Modes and Low Lasing Threshold in Highly Emissive Distyrylbenzene‐Based Molecular Crystals

Varghese

Yoon

Casado

et al. 2014

Advanced Optical Materials

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Stimulated emission in highly luminescent molecular crystals of a dicyanodistyrylbenzene derivative with orthogonal resonator modes, very low lasing threshold, an excellent quality factor, and high mode regularity is demonstrated. The orthogonal resonator mode‐endorsed single crystals acts as 3D resonator cavities and can be effectively implemented as the active medium in organic solid‐state lasers without any external resonator structures.

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Energy Dispersions of Anisotropic Refractive Indices of Thiophene/Phenylene Co-Oligomer Crystals

Cited by 11 publications

References 32 publications

Organic Single Crystal Lasers: A Materials View

Organic Single Crystal Lasers: A Materials View

Optically and electrically excited emissions from organic semiconducting oligomer crystals

Orthogonal Resonator Modes and Low Lasing Threshold in Highly Emissive Distyrylbenzene‐Based Molecular Crystals

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