Origin of the amplified spontaneous emission from thiophene/phenylene co-oligomer single crystals: Towards co-oligomer lasers

Bando, Kiyoshi; Nakamura, Toshiteru; Masumoto, Yasuaki; Sasaki, Fumio; Kobayashi, Shunsuke; Hotta, Shu

doi:10.1063/1.2159083

Cited by 38 publications

(44 citation statements)

References 22 publications

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“…This value is one of the lowest reported in the literature for molecular materials, without energy-transfer processes being involved. Moreover, it is comparable to thresholds of typical semiconducting polymers emitting in the blue region of the optical spectrum (see comparison in Table 1) [17,[27][28][29][30][31]. Note that thresholds in Table 1 are given in power density units (kW=cm 2 ), which are the most convenient to compare the performance of different materials [15].…”

Section: Introductionmentioning

confidence: 94%

Blue surface-emitting distributed feedback lasers based on TPD-doped films

et al. 2010

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Single-mode second-order distributed feedback (DFB) lasers with low threshold, based on polystyrene films doped with 30 wt: % of the hole-transporting organic molecule N,N 0 -bis (3-methylphenyl)-N,N 0 -diphenylbenzidine (TPD) are reported. The laser emission wavelength was tuned between 415 and 427 nm by film thickness variation. The effectiveness of the DFB grating in improving the laser performance is evidenced by the observation of linewidths and laser thresholds lower than those of the amplified spontaneous emission characteristics shown by films without gratings. The use of holographic lithography as the technique for grating recording has allowed us to prepare large samples in a fast, versatile, and simple manner.

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Section: Introductionmentioning

confidence: 94%

Blue surface-emitting distributed feedback lasers based on TPD-doped films

et al. 2010

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“…Therefore, reabsorption could not occur during irradiation above the amplified spontaneous emission (ASE) threshold because reabsorption hardly occurs during population inversion. Bando et al reported the emission behavior of a BP1T single crystal under dye laser excitation (400 nm, 30 ns) [16]. They found that the intensity of the narrow peak at 465 nm was half that of the peak at 495 nm.…”

Section: Resultsmentioning

confidence: 98%

Large gain for crystalline thin films of thiophene/phenylene co-oligomer by photopumping with femtosecond laser pulses

Mochizuki¹,

Kawaguchi²,

Sasaki³

et al. 2014

Journal of Luminescence

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“…These phenyl-thiophene co-oligomers have attracted attention due to their potential as active components in OLEDs, organic diode lasers, and p-type semiconductors in OFETs [80,[234][235][236][237][238][239][240][241][242][243]. Noteworthy features are electroluminescence [237], and emission gain narrowing like spectrally narrowed emission (SNE) [244][245][246], and amplified spontaneous emission (ASE) caused by self-waveguide effects [247][248][249], and even mirrorless lasing [250,251].…”

Section: Discussionmentioning

confidence: 99%

Organic Molecular Nanotechnology

Schiek

Balzer

Al‐Shamery

et al. 2008

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Zur Homepage der Dissertation AbstractFormation of needle-like crystals from inorganic as well as from organic semiconductors such as para-phenylenes, α-thiophenes and phenyl-thiophene co-oligomers on dielectric surfaces has attracted increasing interest within the last years. The para-hexaphenylene has proven to be a versatile building block for generating long, parallely aligned organic nanofibers by a self-assembly process on a muscovite mica substrate via sublimation in high vacuum. These nanofibers possess outstanding optical properties like strong, polarised blue fluorescence in high quantum yields after unpolarised excitation with UV light, waveguiding and lasing features. Furthermore, they are chemically and thermically stable and can be easily detached from the growth substrate to serve as key elements in next generation optoelectronic and nanophotonic devices. Owing to their typical height and width on a nanometer scale and length up to one millimeter, the fibers bridge the gap between microscopic and macroscopic dimensions. The morphology of the nanofibers (length, height, width, aspect ratio, bending into rings) is susceptable to process parameters and pretreatment of the substrate. But chemically functionalisation of the molecular building block as key step of this thesis widens the scope of possibilities: Nanoaggregates with tailored morphology and optical properties are generated from designed functionalised molecular building blocks. Functional groups have been implemented at the 1,4´´´-para-positions of p-quaterphenylenes using a non-trivial Suzuki cross-coupling strategy. Symmetrically as well as non-symmetrically functionalised oligomers have been achieved in excellent yields and high purity. Additionally, the synthesis of phenyl-thiophene cooligomers and their acceptability for the nanofiber growth on muscovite mica via organic molecule deposition in high vacuum are presented. The fluorescence peak emission frequency of the nanostructures from the substituted p-quaterphenylenes shifts within the blue depending on the functionalisation. While dimensions are still influenced by the growth parameters, the overall shape (i.e. cross-section) of the aggregates alters significantly with the functional group. Even new properties like nonlinear optical activity are accessible. Due to intrinsic nonzero hyperpolarisability of push-pull functionalised oligomers, the respective nanofibers act as frequency doublers and emit strong second harmonic light after excitation with near infrared femtosecond laser pulses. Note that this design approach is possible while conserving the concept of highly crystalline nanofibers. Thus, a new route of bottom-up nanotechnology is presented starting from organic molecular synthesis towards generating of tailormade organic nanofibers opening new prospects for future nanotechnology. 3 ZusammenfassungDie Bildung von nadelförmigen Kristallen aus anorganischen und organischen Halbleitermolekülen wie zum Beispiel para-Phenylenen, α-Thiophenen und Phenylthiophen Co-oligomeren fa...

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Origin of the amplified spontaneous emission from thiophene/phenylene co-oligomer single crystals: Towards co-oligomer lasers

Cited by 38 publications

References 22 publications

Blue surface-emitting distributed feedback lasers based on TPD-doped films

Blue surface-emitting distributed feedback lasers based on TPD-doped films

Large gain for crystalline thin films of thiophene/phenylene co-oligomer by photopumping with femtosecond laser pulses

Organic Molecular Nanotechnology

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