研究業績｜信州大学繊維学部 市川研究室

94) M. Ichikawa*, D. Takekawa, H.-G. Jeon, G.D.R. Banoukepa, "Cascade-Type Excitation Energy Relay in Organic Thin-Film Solar Cells", Org. Electron. (Elsevier), 14(3), 814-820 (2013).

93) T. Maruyama, H. Sugishita, H. Kujira, M. Ichikawa, Y. Hattori, J. Motoyoshiya*, "Chemiluminescence behavior of fluorescent aromatics tethered 9-Methylidene-10-methylacridans involving chemiluminescence resonance energy transfer (CRET) quenching", Tetrahedron Lett. (Elsevier), 54(11), 1338-1343 (2013).

92) M. Ichikawa*, "Measurement of Exciton Diffusion Lengths of Phthalocyanine Derivatives Based on Interlayer Excitation Transfer", Thin Solid Films (Elsevier), 527, 239-243 (2013).

91) M. Ichikawa*, S. Deguchi, T. Onoguchi, H.-G. Jeon, G.D.R. Banoukepa, "N,N'-Diphenylperylene Diimide Functioning as a Sensitizing Light Absorber for Organic Thin-Film Solar Cells", Org. Electron. (Elsevier), 14(2), 464-468 (2013).

90) M. Ichikawa*, Y. Yokota, H.-G. Jeon, G.d.R. Banoukepa, N. Hirata, N. Oguma, "Comparative Study of Soluble Naphthalene Diimide Derivatives Bearing Long Alkyl Chains as n-type Organic Thin-Film Transistor Materials", Org. Electron. (Elsevier), 14(2), 516-522 (2013).

89) H.-G. Jeon, N. Oguma, N. Hirata, M. Ichikawa*, "Wet-processed n-type OTFTs utilizing highly-stable colloids of a perylene diimide derivative", Org. Electron. (Elsevier), 14(1), 19-25 (2013).

88) H.-G. Jeon, Y. Yokota, J. Hattori, N. Oguma, N. Hirata, T. Suzuki, M. Ichikawa*, "Novel Perylene Derivative having an Ether Group in the Side Chains for Solution-Processible n-Channel Transistors with Very High Electron Mobility", Appl. Phys. Express (JSAP), 5(4), 041602-1-3 (2012).

87) M. Ichikawa*, T. Yamamoto, H.-G. Jeon, K. Kase, S. Hayashi, M. Nagaoka, N. Yokoyama, "Benzene substituted with bipyridine and terpyridine as electron-transporting materials for organic light-emitting devices", J. Mater. Chem. (RSC), 22(14), 6765-6773 (2012).

86) M. Ichikawa*, T. Takeuchi, H.-G. Jeon, Y. Jin, S. Lee, K.-S. Kim, "Organic photodiode with high infrared light sensitivity based on tin phthalocyanine/C60 bulk heterojunction and optical interference effect", Jpn. J. Appl. Phys. (JSAP), 51(3), 034103-1-4 (2012).

85) D. Heredia, L. Fernandez, L. Otero, M. Ichikawa, C.-Y. Lin, Y.-L. Liao, S.-A. Wang, K.-T. Wong, F. Fungo, "Electrochemical Tuning of Morphological and Optoelectronic Characteristics of Donor–Acceptor Spiro-Fluorene Polymer Film. Application in the Building of an Electroluminescent Device", J. Phys. Chem. C (ACS), 115(44), 21907-21914 (2011).

84) M. Ichikawa*, S. Mochizuki, H.-G. Jeon, S. Hayashi, N. Yokoyama, Y. Taniguchi, "Bipyridyl-substituted benzo[1,2,3]triazoles as a thermally stable electron transporting material for organic light-emitting devices", J. Mater. Chem. (RSC), 21(32), 11791-11799 (2011).

83) M. Ichikawa*, K. Yamamura, H.-G. Jeon, M. Nakajima, Y. Taniguchi, "Effects of volatile additives in solutions used to prepare polythiophene-based thin-film transistors", J. Appl. Phys. (AIP), 109(05), 054504-1-6 (2011).

82) Lu, L., F. Yu, L. Long, J. Yu, B. Wei*, J. Zhang, M. Ichikawa, "Field effect transistor behavior of organic light-emitting diodes with a modified configuration of ITO anode", Synth. Met. (Elsevier), 160(23-24), 2417-2421 (2010).

81) H.-G. Jeon, J. Hattori, S. Kato, N. Oguma, N. Hirata, Y. Taniguchi, M. Ichikawa*, "Thermal treatment effects on N-alkyl perylene diimide thin-film transistors with different alkyl chain", J. Appl. Phys. (AIP), 108(12), 124512-1-6 (2010).

80) M. Ichikawa*, K. Wakabayashi, S. Hayashi, N. Yokoyama, T. Koyama, Y. Taniguchi, "Bi- or Ter-pyridine Tris-Substituted Benzenes as Electron-Transporting Materials for Organic Light-Emitting Devices", Org. Electron. (Elsevier), 11(12), 1966-1973 (2010).

79) Y. Higashi, K.-S. Kim, H.-G. Jeon, M. Ichikawa*, "Enhancing Spectral Contrast in Organic Red-Light Photodetectors Based on a Light-Absorbing and Exciton-Blocking Layered System", J. Appl. Phys. (AIP), 108(3), 034502-1-5 (2010).

78) M. Ichikawa*, T. Kato, T. Uchino, T. Tsuzuki, M. Inoue, H.-G. Jeon, T. Koyama, Y. Taniguchi, "Thin-film and single-crystal transistors based on a trifluoromethyl-substituted alternating thiophene/phenylene co-oligomer", Org. Electron. (Elsevier), 11(9), 1549-1554 (2010).

77) H.-G. Jeon, Y. Kondo, S. Maki, E. Matsumoto, Y. Taniguchi, M. Ichikawa*, "A highly efficient sublimation purification system using baffles with orifices", Org. Electron. (Elsevier), 11(5), 794-800 (2010).

76) M. Ichikawa*, E. Suto, H.-G. Joen,Y. Taniguchi, "Sensitization of organic photovoltaic cells based on interlayer excitation energy transfer", Org. Electron. (Elsevier), 11(4), 700-704 (2010).

75) T. Yamao*, Y. Nishimoto, K. Terasaki, H. Akagami, T. Katagiri, S. Hotta, M. Goto, R. Azumi, M. Inoue, M. Ichikawa, and Y. Taniguchi, "Single-Crystal Growth and Charge Transport Properties of an Alternating Co-Oligomer Composed of Thiophene and Phenylene Rings" Jpn. J. Appl. Phys. (JSAP) , 49(4), 04DK20-1-4 (2010).

74) Y. Zhang, M. Ichikawa*, J. Hattori, T. Kato, A. Sazaki, S. Kanazawa, S. Kato, C. Zhang, Y. Taniguchi, "Fused Thiophene-Split Oligothiophenes with High Ionization Potentials for OTFTs", Synth. Met. (Elsevier), 159 (17-18), 1890-1895 (2009).

73) M. Ichikawa*, T. Aoyama, J. Amagai, T. Koyama, Y. Taniguchi, "Dynamic Behavior of Electroluminescence from Phosphor-Sensitized Red Fluorescent Organic Light-Emitting Diodes", J. Phys. Chem. C (ACS), 113 (27), 11520-11523 (2009).

72) T. Fukuda*, B. Wei, M. Ichikawa, Y. Taniguchi, "Transient characteristics of organic light-emitting diodes with efficient energy transfer in emitting material", Thin Solid Films (Elsevier), 508 (2), 567-570 (2009).

71) N. Fujino, M. Ichikawa*, T. Koyama, Y. Taniguchi, "A molecular thermometer based on luminescence of copper(II) tetraphenylporphyrin", Thin Solid Films (Elsevier), 508 (2), 563-566 (2009).

70) T. Fukuda*, B. Wei, E. Suto, M. Ichikawa, Y. Taniguchi, "Fast-response organic–inorganic hybrid light-emitting diode", Phys. Stat. Sol. (RRL) (Wiley), 2 (6), 290-292, (2008).

69) S. Kanazawa, A. Uchida, M. Ichikawa*, T. Koyama, Y. Taniguchi, "Photoluminescence and Optical Gain Properties of a Crystalline Thiophene/Phenylene Co-oligomer", Jpn. J. Appl. Phys. (JSAP), 47 (12), 8961-8964, (2008).

68) H.-G. Jeon, M. Inoue, N. Hiramatsu, M. Ichikawa*, Y. Taniguchi, "A Modified Sublimation Purification System Using Arrays of Partitions", Org. Electron. (Wiley), 9 (5), 903-905 (2008).

66) M. Ichikawa*, C. Shimizu, T. Koyama, Y. Taniguchi, "Improvement of Photovoltaic Performances of Organic Thin-Film Solar Cells by Fast Electron Mobility Oxadiazole as an Exciton Blocking Layer Material", Phys. Status Solidi (a) (Wiley), 205 (5), 1222-1225, (2008).

66) S. Kanazawa, M. Ichikawa*, Y. Fujita, R. Koike, T. Koyama, Y. Taniguchi, "Effect of Thiophene Sequence Separation on Air-stable Organic TFT Materials", Org. Electron. (Elsevier), 9 (4), 425-431, (2008).

65) S. Tatemichi, M. Ichikawa*, S. Kato, T. Koyama, Y. Taniguchi, "Low-Voltage, High-Gain, and High-Mobility Organic Complementary Inverters Based on N,N’-Ditridecyl-3,4,9,10-Perylenetetracarboxylic Diimide and Pentacene", Phys. Status Solidi (RRL) (Wiley), 2 (2), 47-49, (2008).

64) M. Ichikawa*, S. Fujimoto, Y. Miyazawa, T. Koyama, N. Yokoyama, T. Miki, Y. Taniguchi, "Bipyridyl-Substituted Triazoles as Hole-Blocking and Electron-Transporting Materials for Organic Light-Emitting Devices", Org. Electron. (Elsevier), 9 (1), 77-84, (2008).

63) T. Fukuda*, B. Wei, M. Ichikawa, Y. Taniguchi, "Enhanced modulation speed of tris(8-hydroxyquinoline)aluminum-based organic light source with low-work-function electrode", Jpn. J. Appl. Phys. (JSAP), 46 (12), 7880-7884, (2007).

62) B. Wei*, S. Yamamoto, M. Ichikawa, C. Li, T. Fukuda, Y. Taniguchi, "High-efficiency transparent organic light-emitting diode with one thin layer of nickel oxide on a transparent anode for see-through-display application", Semicond. Sci. Tech. (IOP), 22 (7), 788, (2007).

61) T. Fukuda*, T. Okada, B. Wei, M. Ichikawa, Y. Taniguchi, "Influence of carrier-injection efficiency on modulation rate of organic light source", Opt. Lett. (OSA), 32 (13), 1905-1907, (2007).

60) V. Promarak*, M. Ichikawa, T. Sudyoadsuk, S. Saengsuwan, T. Keawin, "Synthesis and properties of hole-transporting fluorene linked bistriphenylamine", Opt. Mater. (Elsevier), 30 (3), 364-369, (2007).

59) C. Li*, B. Wei, K. Kawaguchi, T. Saito, H. Kimura, M. Ichikawa, Y. Taniguchi, "Low-voltage driving three-peak white organic light emitting diodes with color conversion hole injection layer based on host-guest energy transfer", Jpn J. Appl. Phys. (JSAP), 46 (11), 7487-7489, (2007).

58) T. Fukuda*, M. Ohashi, B. Wei, T. Okada, M. Ichikawa, Y. Taniguchi, "Transient response of blue organic electroluminescence devices with short fluorescence lifetime of substituted phenyl/vinyl compound as an emissive layer", Opt. Lett. (OSA), 32 (9), 1150-1152, (2007).

57) T. Fukuda*, T. Okada, B. Wei, M. Ichikawa, Y. Taniguchi, "Transient property of optically pumped organic film of different fluorescence lifetimes", Appl. Phys. Lett. (AIP), 90 (23), 231105-1-231105-3.

56) C. Li*, M. Ichikawa, B. Wei, Y. Taniguchi, H. Kimura, K. Kawaguchi, and K. Sakurai, "A highly color-stability white organic light-emitting diode by color conversion within hole injection layer", Opt. Express (OSA), 15 (2), 608-615 (2007).

55) V. Promarak*, M. Ichikawa, T. Sudyoadsuk, S. Saengsuwan, S. Jungsuttiwong, and T. Keawin, "Synthesis of electrochemically and thermally stable amorphous hole-transporting carbazole dendronized fluorene", Synth. Met. (Elsevier), 157 (1), 17-22 (2007).

54) T. Fukuda*, T. Okada, B. Wei, M. Ichikawa, M. Ohashi, Y. Taniguchi, "High coupling effciency with optical fiber for mircocavity organic light-emitting diode as light source for optical interconnects", Jpn J. Appl. Phys. (JSAP), 46 (2), 642-646 (2007).

53) M. Ichikawa*, K. Kobayashi, T. Koyama, and Y. Taniguchi, "Intense and efficient ultraviolet electroluminescence from organic light-emitting devices with fluorinated copper phthalocyanine as hole injection layer", Thin Solid Films (Elsevier), 515, 3932-3935 (2007).

52) M. Ichikawa*, N. Hiramatsu, N. Yokoyama, T. Miki, S. Narita, T. Koyama, and Y. Taniguchi, "Electron transport with mobility of above 10-3 cm2/Vs in amorphous film of co-planar bipyridyl-substituted oxadiazole", Phys. Status Solidi (RRL) (Wiley), 1 (1), R37-R39 (2007).

51) V. Promarak*, M. Ichikawa, D. Meunmart, T. Sudyoadsuk, S. Saengsuwan, T. Keawin, "Synthesis and properties of stable amorphous hole-transporting molecules for electroluminescent devices", Tetrahedron Lett. (Elsevier), 47 (50), 8949-8952 (2006).

50) B. Wei*, N. Kobayashi, M. Ichikawa, T. Koyama, Y. Taniguchi, and T. Fukuda, "Organic solid laser pumped by an organic light-emitting diode", Opt. Express (OSA), 14 (20), 9436-9443 (2006).

49) M. Ichikawa*, K. Hibino, N. Yokoyama, T. Miki, T. Koyama, and Y. Taniguchi, "Solution-processable dendric triphenylamine nonamers as hole-transporting and hole-injection materials for organic light-emitting devices", Synth. Met. (Elsevier), 156, 1383-1389 (2006).

48) M. Ichikawa*, L. You, S. Tatemichi, T. Koyama, and Y. Taniguchi, "Organic Thin-Film Transistors with Conductive Metal-Oxides as Source-Drain Electrodes", Jpn J. Appl. Phys. (JSAP), 45 (44), L1171-L1174 (Express Letter) (2006).

47) F. Sasaki*, S. Kobayashi, S. Haraichi, H. Yanagi, S. Hotta, M. Ichikawa, and Y. Taniguchi, "Pulse-shaped emissions with the time delay in single crystals of thiophene/phenylene co-oligomers", Jpn J. Appl. Phys. (JSAP), 45 (45), L1206-L1208 (2006).

46) S. Tatemichi, M. Ichikawa*, T. Koyama, Y. Taniguchi, "High mobility n-type thin-film transistors based on N, N'-ditridecyl perylene diimide with thermal treatments", Appl. Phys. Lett. (AIP), 89 (11), 112108 (2006).

45) S. Kanazawa, M. Ichikawa*, T. Koyama Y. Taniguchi, "Self-waveguided photoemission and lasing of organic crystalline wires obtained by an improved expitaxial growth method", ChemPhysChem (Wiley), 7 (9), 1881-1884 (2006).

44) K. Sakai*, M. Ichikawa, Y. Taniguchi, "Photoluminescent mechanism of a proton-transfer laser dye in highly doped polymer films", Chem. Phys. Lett. (Elsevier), 420, 405 (2006).

43) K. Sakai*, T. Hasegawa, M. Ichikawa, Y. Taniguchi, "Field-effect characteristics of a one-dimensional platinum chain compound, bis(1,2-benzoxinonedioximato)platinum(II)", Chem. Lett., 34, 302 (2006).

42) K. Sakai*, T. Imakubo, M. Ichikawa, Y. Taniguchi, "A photoluminescent six-coordinated zinc(II) complex with hydroxides as axial ligands", [Zn(Hhpa)2(OH)2] (Hhpa = 3-hydroxypicolinamide), Dalton Trans., 881 (2006).

41) M. Ichikawa*, T. Kawaguchi, K. Kobayashi, T. Miki, K. Furukawa, T. Koyama, Y. Taniguchi, "Bipyridyl Oxadiazoles as Efficient and Durable Electron-Transporting and Hole-Blocking Molecular Materials", J. Mater. Chem., 16 (2), 221 (2006).

40) M. Ichikawa*, K. Nakamura, M. Inoue, H. Mishima, T. Haritani, R. Hibino, T. Koyama, Y. Taniguchi, "Photopumped laser oscillation and charge-injected luminescence from organic semiconductor single crystals of a thiophene/phenylene co-oligomer", Appl. Phys. Lett., 87 (22), 221113 (2005).

39) K. Nakamura, M. Ichikawa*, R. Fushiki, T. Kamikawa, M. Inoue, T. Koyama, Y. Taniguchi, "Light Emission from Organic Single Crystal Field-Effect Transistors", Jpn. J. Appl. Phys. 44 (44), L1367-L1369 (2005).

38) M. Nomura, Y. Shibasaki, M. Ueda*, K. Tugita, M. Ichikawa, and Y. Taniguchi, "New amorphous electron-transporting materials based on Tris-benzimidazoles for all wet-process OLED devices", Synth. Met., 151 (3), 261-268 (2005).

37) M. Ichikawa*, R. Hibino, M. Inoue, T. Haritani, S. Hotta, K. Araki, T. Koyama, Y. Taniguchi, "Laser Oscillation in Monolithic Molecular Single Crystals", Adv. Mater. 17 (17), 2073-2077 (2005).

36） B. Wei*, Y. Horiba, K. Furukawa, M. Ichikawa, T. Koyama, Y. Taniguchi, "Electroluminescence Spikes of Pulsed Organic Light-Emitting Diodes at Switch-Off Using 1,4-Bis[2-[4-[N,N-di(p-tolyl)aminophenyl]vinyl]benzene as a Light-Emitting layer", Jpn J. Appl. Phys. 44 (6A), 4248-4251 (2005).

35) S. Kobayashi*, F. Sasai, H. Yanagi, S. Hotta, M. Ichikawa, Y. Taniguchi, "Spectrally narrowed emission in 2,5-bis(4-biphenyl)thiophene crystals pumped by fs laser pulse", J. Lumin. 112, 325-328 (2005).

34) K. Sakai*, T. Tsuzuki, Y. Itoh, M. Ichikawa, Y. Taniguchi, "Using proton-transfer laser dyes for organic laser diodes", Appl. Phys. Lett., 86, 081103 (2005).

33) B. Wei*, K. Furukawa, M. Ichikawa, T. Koyama, Y. Taniguchi, "Use of Trapezoid Pulse Voltage in Study of Transient Response of Organic Light-Emitting Diodes", Jpn J. Appl. Phys. 44 (1B), 604-607 (2005).

32) K. Sakai*, T. Sonoyama, T. Tsuzuki, M. Ichikawa, Y. Taniguchi, "Lead Halide-based Layered Perovskites incorprated with a p-Terphenyl Laser Dye", Chem. Lett. 34 (2), 212-213 (2005).

31) B. Wei, K. Furukawa, M. Ichikawa, T. Koyama, Y. Taniguchi*, "Energy Transfer and Charge Trapping in Dye-Doped Organic Light-Emitting Diodes", Mol. Cryst. Liq. Cryst. (Taylor & Francis), 426, 295-302, (2005).

30) M. Nomura, Y. Shibasaki, M. Ueda*, K. Tugita, M. Ichikawa, Y. Taniguchi, "Synthesis and Properties of Poly[di(1-naphthyl)-4-tolylamine] as a Hole Transport Material", Macromolecules, 37 (4), 1204-1210 (2004).

29) B. Wei*, K. Furukawa, J. Amagai, M. Ichikawa, T. Koyama, Y. Taniguchi, "A dynamic model for injection and transport of charge carriers in pulsed organic light-emitting diodes", Semicond. Sci. Tech., 19 (5), L56, (2004).

28) S. Hotta*, M. Goto, R. Azumi, M. Inoue, M. Ichikawa, Y. Taniguchi, "Crystal Structures of Thiophene/Phenylene Co-Oligomers with Different Molecular Shapes", Chem. Mater., 16 (2), 237-241 (2004).

27) K. Nakamura, M. Ichikawa*, R. Fushiki, T. Kamikawa, M. Inoue, T. Koyama, Y. Taniguchi, "Organic Field-Effect Transistor of (Thiophene/Phenylene) Co-Oligomer Single Crystals with Bottom-Contact Configuration", Jpn. J. Appl. Phys., 43 (1A/B), L100-L102 (Express Letter) (2004).

26) M. Ichikawa*, J. Amagai, Y. Horiba, T. Koyama, Y. Taniguchi, "Dynamic Turn-On Behavior of Organic Light-Emitting Devices with Different Work Function Cathode Metals under Fast Pulse Excitation", J. Appl. Phys., 94 (12), 7796-7800 (2003).

25) H. Yanagi*, Y. Araki, T. Ohara, S. Hotta, M. Ichikawa, Y. Taniguchi, "Comparative Carrier Transport Characteristics in Organic Field-Effect Transistors with Vapor-Deposited Thin Films and Epitaxially Grown Crystals of Biphenyl-Capped Thiophene Oligomers", Adv. Func. Mater., 13 (10), 767-773 (2003).

24) K. Sakai*, T. Tsuzuki, J. Motoyoshiya, M. Inoue, Y. Itoh, M. Ichikawa, T. Fujimoto, I. Yamamoto, T. Koyama, Y. Taniguchi, "Relationship between Molecular Skeleton and Stimulated-emission Threshold in Dilute Thin Films of Linear-chain-structured Fluorescent Dyes", Chem. Lett., 32 (10), 968-969 (2003).

23) A. Seki, M. Ichikawa, N. Suganuma, Y. Tanaka, T. Koyama, Y. Taniguchi, "Organic Polymer DBR laser by Softlithography II: Optimization of Distributed Bragg Reflector", J. Photopolym. Sci. Tech. 16 (2), 329-334 (2003).

22) M. Ichikawa*, Y. Tanaka, N. Suganuma, T. Koyama, Y. Taniguchi, "Low-Threshold Photopumped Distributed Feedback Plastic Laser Made by Replica Molding", Jpn J. Appl. Phys., 42 (9A), 5590-5593 (2003).

21) M. Ichikawa*, T. Tachi, M. Satsuki, S. Suga, T. Koyama and Y. Taniguchi, "Gain-narrowing characteristics of fluorescent organic molecules with symmetrical or asymmetrical structures in a neat thin-film optical waveguide", J. Photochem. Photobio A, 158, 219-221 (2003).

20) M. Ichikawa*, R. Hibino, M. Inoue, S. Hotta, T. Koyama, Y. Taniguchi, "Improved Crystal-Growth and Emission Gain-Narrowing of Thiophene/Phenylene Co-oligomers", Adv. Mater., 15 (3), 213-217 (2003).

19) M. Ichikawa*, H. Yanagi, Y. Shimizu, S. Hotta, N. Suganuma, T. Koyama, Y. Taniguchi, "Organic Field-Effect Transistors Made of Epitaxially Grown Crystals of a Thiophene/Phenylene Co-oligomer", Adv. Mater., 14 (18), 1272-1275 (2002).

18) N. Suganuma, Y. Tanaka, A. Seki, M. Ichikawa, T. Koyama, Y. Taniguchi, "Organic Polymer DBR laser by Softlithography", J. Photopolym. Sci. Tech., 15 (2), 273-278 (2002).

17) M. Kume, M. Ichikawa, T. Koyama, Y. Taniguchi, "New Charge-Transporting Fluorinated Materials for Organic Light-Emitting Diodes and Organic Semiconductor Lasers", Mol. Cryst. Liq. Cryst., 377, 81-84 (2002).

16) M. Ichikawa, H. Shibata, K. Nukada, K. Sato, T. Koyama, Y. Taniguchi, "Influence of Hole Accumulation and Leakage at Organic/Organic Interface on Device Characteristics of Organic Light-Emitting Diodes", Mol. Cryst. Liq. Cryst., 377, 65-68 (2002).

15) M. Ichikawa*, Y. Horiba, H. Nakatani, M. Yamada, T. Koyama, Y. Taniguchi, "Method of Measuring Charge Carrier Mobility in Organic Light-Emitting Diodes Using Fast Transient Electroluminescence Responses", Jpn. J. Appl. Phys., 41 (4A), 2252-2253 (2002).

14) M. Nagawa, R. Hibino, S. Hotta, H. Yanagi, M. Ichikawa, T. Koyama, Y. Taniguchi*: "Emission gain narrowing from single crystals of a thiophene-phenylene co-oligomer", Appl. Phys. Lett., 80 (4), 544 (2002).

13) R. Hibino, M. Nagawa, S. Hotta, M. Ichikawa, T. Koyama, Y. Taniguchi*, "Emission Gain-Narrowing from Melt-Recrystallized Organic Semiconductors", Adv. Mater., 14 (2), 119 (2002).

12) M. Ichikawa*, Y. Tanaka, N. Suganuma, T. Koyama, Y. Taniguchi: "Photopumped organic solid-state dye laser with a second-order distributed feedback cavity", Jpn. J. Appl. Phys., 40 (8A), L799-L801 (2001).

11) M. Ichikawa*, R. Naitou, T. Koyama, Y. Taniguchi, "Exciton Dynamics in Organic Semiconductor Devices: Investigation of Exciton-Charge Carrier Interactions as Revealed by Photoluminescence Response", Jpn. J. Appl. Phys., 40 (10A), L1068-L1070 (2001).

10) R. Naitou, M. Ichikawa, C. Adachi, T. Suzuki, T. Koyama, Y. Taniguchi, "Energy relay systems for efficient organic light-emitting devices: influence of formation of exciplex as revealed by photoexcitation", Mol. Cryst. Liq. Cryst., 370, 31-34 (2001).

9) M. Nagawa, M. Ichikawa, T. Koyama, H. Shirai, Y. Taniguchi*, A. Hongo, S. Tsuji, Y. Nakano, "Organic solid-state distributed feedback dye laser with a nonmorphological modification grating", Appl. Phys. Lett., 77 (17), 2641-2643 (2000).

8) K. Mori, T. Ning, M. Ichikawa, T. Koyama, Y. Taniguchi*, "Organic light-emitting devices patterned by screen-printing", Jpn. J. Appl. Phys., 39 (9A/B), L942-L944 (2000).

7) T. Asahi*, A. Furube, H. Fukumura, M. Ichikawa, H. Masuhara, "Development of a femtosecond diffuse reflectance spectroscopic system, evaluation of its temporal resolution, and applications to organic powder systems", Rev. Sci. Instrum., 69 (2), 362-371 (1998).

6) A. Onkelinx, F.C. DeSchryver*, L. Viaene, M.V.d. Auweraer, K. Iwai, M. Yamamoto, M. Ichikawa, H. Masuhara, "Radiative Depopulation of the Excited Intramolecular Charge-Transfer State of 9-(4-(N,N-Dimethylamino)phenyl)phenanthrene", J. Am. Chem. Soc., 118 (12), 2892-2902 (1996).

5) H.V. Mingrooth, L. Viaene, M.V.d. Auweraer, F.C. DeSchryver*, M. Ichikawa, H. Fukumura, H. Masuhara, "A Nanosecond Transient Absorption Study of Photoinduced Heat Generation in Microcrystals of x-Metal-Free Phthalocyanine Dispersed in Polymer Films", J. Phys. Chem., 99 (47), 17174-17180 (1995).

4) M. Ichikawa, H. Fukumura, H. Masuhara*, A. Koide, H. Hyakutake, "A Picosecond Regular Reflection Polarization Spectroscopic Study on Ultrafast Photothermal Conversion Dynamics and Energy Migration of Amorphous Cu-Phthalocyanine Solid", Chem. Phys. Lett., 232 (4), 346-350 (1995).

3) M. Ichikawa, H. Fukumura, H. Masuhara*, "Ultrafast Electron-Transfer and Recombination Processes in Copper Phthalocyanine Solid/Water Interface As Revealed by Picosecond Regular Reflection Spectroscopy", J. Phys. Chem., 99 (32), 12072-12075 (1995).

2) M. Ichikawa, H. Fukumura, H. Masuhara*, "Picosecond Regular Reflection Spectroscopic Study on Ultrafast Photoinduced Heat Generation in Copper Phthalocyanine Solid", J. Phys. Chem., 98 (47), 12211-12214 (1994).

1) Y. Hirata*, M. Ichikawa, N. Mataga, "Monophotonic Ionization from the Vibrationally Unrelaxed Excited Singlet State of N,N,N',N'-Tetramethyl-p-Phenylendiamine in Acetonitrile Solution", J. Phys. Chem., 94 (10), 3872-3874 (1990).