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Volume 87, Issue 12
Displaying 1-5 of 5 articles from this issue
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The Special Issue / Crystals and Colorants
Current Topics
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Toshimitsu SATO, Keiji SHITO, Akito MASUHARA2014 Volume 87 Issue 12 Pages 425-429
Published: December 20, 2014
Released on J-STAGE: March 20, 2015
JOURNAL FREE ACCESSC60 nano and microcrystals were successfully prepared by employing a reprecipitation method, with the C60 nanocrystals possessing various unexpected shapes and surprisingly monodispersed sizes. The shapes and inner structures of the resulting C60 nanocrystals were strongly dependent on the combination of good and poor solvents. In addition, it was possible to prepare assembled C60 nanocrystals in two- and/or three-dimensional order by employing a liquid-liquid interfacial assemble technique and electrophoretic deposition method.
Using these C60 thin films, it was attempted to fabricate organic photovoltaic solar cells.
By using nanocrystals, it is easy to control the inner structure of organic photovoltaic solar cells.View full abstractDownload PDF (2814K)
Review
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Tsukasa TORIMOTO, Tatsuya KAMEYAMA, Taro UEMATSU, Susumu KUWABATA2014 Volume 87 Issue 12 Pages 430-435
Published: December 20, 2014
Released on J-STAGE: March 20, 2015
JOURNAL FREE ACCESSSize-quantized semiconductor nanoparticles, quantum dots, have been intensively investigated for the application to photoluminescent materials,because they exhibit unique physicochemical properties different from those of bulk materials. Many efforts have been made to develop high-quality semiconductor nanoparticles, mainly composed of binary elements, such as CdSe, CdTe, and PbS via solution-phase strategies. On the other hand, I-III-VI2 group chalcopyrite-type semiconductor nanoparticles, such as CuInS2 and AgInS2, have recently attracted much attention due to their low toxicity and wide range of absorption from UV to visible or near-infrared regions. In the present paper, we review our recent research on tunable photo-properties of size-quantized nanoparticles of Cd-based semiconductors and low-toxic chalcopyrite-type semiconductors. Size-selective photoetching enables the precise control of CdS, CdSe, and CdTe, in which the photoluminescence properties can be controlled by changing their size. The optical properties of AgInS2 nanoparticles are easily varied by making its solid solution with ZnS, in which the photoluminescent color is dependent on the chemical composition of solid solution particles.View full abstractDownload PDF (1855K) -
Hajime NAKANOTANI, Chihaya ADACHI2014 Volume 87 Issue 12 Pages 436-441
Published: December 20, 2014
Released on J-STAGE: March 20, 2015
JOURNAL FREE ACCESSTo improve device performance of organic light-emitting transistors, enhancement of both light-emitting and carrier transport properties in organic semiconducting layers are essentially required, i.e., the combination of high photoluminescence efficiency and high charge carrier transport ability. To solve this issue, we developed dye-doped organic crystal based organic light-emitting transistors that possess light amplification ability, but keeping high carrier mobilities. This report describes the optical and electrical characteristics of organic light-emitting transistors having dye-doped organic crystals as an active layer.View full abstractDownload PDF (1680K) -
Yutaka TAKAHASHI, Yukishige KONDO2014 Volume 87 Issue 12 Pages 442-447
Published: December 20, 2014
Released on J-STAGE: March 20, 2015
JOURNAL FREE ACCESSProducts with a metallic luster usually appeal to people as they give a sense of luxury. In particular, gold coloration has immense aesthetic appeal and hence has been the preferred color for numerous products over many generations. Metallic paints are industrially produced by adding metallic powders to paints. There are few studies on low-molecular-weight organic crystals with a golden luster. This article presents an overview of research on such compounds with special emphasis on recently discovered ones.View full abstractDownload PDF (3100K) -
Kiyoshi TSUGE2014 Volume 87 Issue 12 Pages 448-453
Published: December 20, 2014
Released on J-STAGE: March 20, 2015
JOURNAL FREE ACCESSCoordination complexes are well-known chromophores because of their tunable absorption bands in the visible region, which, in addition, are known to display colorful luminescence when appropriate metal centers and ligands are combined. Recently, luminescent copper(I) complexes are attracting wide interest because of their strong emission in the solid state at room temperature with various ligand sets. Here, the control of luminescent colors by the ligands adopted and the effect from copper(I)-copper(I) interaction are discussed by mainly referring the series of copper(I) complexes with dinuclear and tetranuclear units bridged by halogeno ligands. The luminescence of mixed crystals of copper(I) complexes are also described.View full abstractDownload PDF (2230K)
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