The Review of Laser Engineering
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Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 46, Issue 1
Special Issue on Recent Trend of Organic Soft Material for Lasers and Optoelectro
Displaying 1-8 of 8 articles from this issue
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Special Issue on Recent Trend of Organic Soft Material for Lasers and Optoelectronics
Special Issue
Laser Review
  • Preface to Special Issue on Recent Trend of Organic Soft Material for Lasers and Optoelectronics
    Yuji OKI
    2018 Volume 46 Issue 1 Pages 4-
    Published: 2018
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.46.1_4
    JOURNAL FREE ACCESS
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    Research on lasers using organic materials and soft materials has a very long history, and the contributing to 'immediate realization of ideas for lasers' have been often provided by the organic material process. This“ Special Issue” will introduce innovative researches about organic soft-materials about laser and optoelectronics.
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  • Quasi-Continuous-Wave Operation of Organic Semiconductor Lasers
    Atula S. D. SANDANAYAKA
    2018 Volume 46 Issue 1 Pages 6-
    Published: 2018
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.46.1_6
    JOURNAL FREE ACCESS
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    We report low-threshold organic surface-emitting distributed feedback lasers that operate in a quasi continuous-wave regime at 80 MHz and under 30 ms. The stability of the device was significantly enhanced with the encapsulation of CYTOP, resulted in 3% loss even after 500 pulse shots.
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  • High Current Density Injection into Polymer Light-Emitting Electrochemical Cells
    Tomo SAKANOUE
    2018 Volume 46 Issue 1 Pages 10-
    Published: 2018
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.46.1_10
    JOURNAL FREE ACCESS
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    We proposed the use of light-emitting electrochemical cells (LECs) to demonstrate polymer injection lasers. We demonstrated optically pumped amplified spontaneous emission (ASE) in the active layer of LECs by a blend of a polymer and an ionic liquid. Using ionic liquid enabled the film blend to maintain a high degree of transparency with the flat surface, resulting in film as an optical slab waveguide that achieved a low ASE threshold energy of 4 μJ/cm2. A planar LEC based on the polymer:ionic liquid blend showed a fast turn-on, a bright linear shape emission in the middle of the two contacts, and a high current density over 1 kA/cm2 using a pulse driving technique. Furthermore, the application of short voltage pulses of 200 ns successfully avoided an efficiency roll off, which is a critical issue for laser oscillation by electrical excitation under high current density.
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  • Photophysical Properties of Bis-Styrylbenzene Derivatives with Electron-Withdrawing Groups
    Hiroyuki MOCHIZUKI
    2018 Volume 46 Issue 1 Pages 15-
    Published: 2018
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.46.1_15
    JOURNAL FREE ACCESS
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    This paper reports the photophysical properties of E,E-1,4-bis(4-trifluoromethylstyryl)benzene (4CF3) as a benchmark and discuss four other bis-styrylbenzene derivatives (BSDs): E,E-1,4-bis(2- trifluoromethylstyryl)benzene (2CF3), E,E-1,4-bis(3-trifluoromethylstyryl)benzene (3CF3), E,E-1,4- bis(4-cyanostyryl)benzene (4CN), and E,E-1,4-bis(4-nitrostyryl)benzene (4NO2.) The author confirmed the microcrystals of 4CF3 for amplified spontaneous emission. The fluorescence quantum efficiency of 2CF3 in its solid state was much higher than that in its solution, suggesting that 2CF3 showed aggregation-induced emission. The ionization potential values (IPs) of the BSDs were markedly affected by the introduction position of the trifluoromethyl (CF3) group; the IPs of 2CF3, 3CF3, and 4CF3 were ‒5.9 eV, ‒6.7 eV, and ‒6.5 eV, respectively. The IP of 4CF3 was lower than those of 4NO2 and 4CN, meaning the introduction of the CF3 group effectively lowered the IP.
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  • Recent Progress in Studies of Room-Temperature Cavity Polariton in Organic Compounds
    Kenichi YAMASHITA, Takeshi YAMAO, Hisao YANAGI
    2018 Volume 46 Issue 1 Pages 20-
    Published: 2018
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.46.1_20
    JOURNAL FREE ACCESS
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    Microcavity devices using organic luminescent materials are highly promising for the cavity polariton formation and condensate at room temperature. Furthermore the state of cavity polariton might be also helpful to achieve the electrically driven organic laser owing to its half-matter and half-light nature. In this article we review recent progresses of the organic cavity polariton studies including some recent results presented by the authors’group, which are on a highly molecular oriented organic single crystal microcavity.
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  • Self-Assembled Conjugated Polymer Microsphere Resonators and Lasers
    Yohei YAMAMOTO
    2018 Volume 46 Issue 1 Pages 25-
    Published: 2018
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.46.1_25
    JOURNAL FREE ACCESS
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    We present self-assembled conjugated polymer microspheres that act as whispering gallery mode (WGM) resonators. For the preparation of conjugated polymer microspheres, vapor diffusion and miniemulsion methods are adopted. For the vapor diffusion method to obtain microspheres, amorphous aggregation of the polymers are crucial by introducing sterically bulky moieties that largely twists the polymer main chain. Focused laser irradiation to the perimeter of the microspheres excites WGM, where sharp and periodic lines appear in the PL spectrum. With a benefit of the high light confinement properties, we demonstrate long distance, directional, and efficient light energy transfer and wavelength conversion through bispheres. Furthermore, WGM lasing is achieved from conjugated polymer microspheres upon femtosecond pumping. Conjugated polymer microsphere resonators have advantages of high photoabsorptivity, high refractive index, and inherent conducting properties, as well as the simple fabrication process, which are valuable for applications to optical circuits, electrically-driven lightings, and chemical and biological sensors
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  • Soft Photonic Crystal Lasers of Organic Materials by Self-Assembly
    Seiichi FURUMI
    2018 Volume 46 Issue 1 Pages 30-
    Published: 2018
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.46.1_30
    JOURNAL FREE ACCESS
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    This article describes an overview of the developments in fabrication methodologies of colloidal crystals (CCs) as photonic crystals (PCs) and their laser applications. The CCs have intrinsic capabilities to selfassemble the 3D-PC structure of micro-particles. When the periodic length in the CC structures corresponds to several hundred nanometers of the visible light wavelength, the photonic band-gaps (PBGs) can be visualized as reflection colors according to Bragg’s law. When combining light-emitting organic dyes within the CC structures, the stimulated laser action at PBG wavelength edge or within PBG wavelength range can be generated by optical excitation due to the PBG effect. Moreover, we succeed in the demonstration of flexible and tunable laser action from the CC structures with lightemitting organic dyes. The preset review highlights not only the research backgrounds of CCs as PCs, but also the experimental results of our soft organic CC lasers.
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