Unusual photoluminescence characteristics of tetraphenylpyrene (TPPy) in various aggregated morphologies

Abstract We found that 1,3,6,8-tetraphenylpyrene (TPPy) demonstrates unusual photoluminescence (PL) characteristics in the solid-state morphologies. We investigated the PL characteristics of TPPy in various morphologies including powder, deposited film, and solutions. The TPPy powder (A), which was prepared through column chromatography, recrystallization, and train sublimation, showed blue fluorescence with a peak of maximum wavelength of λ max  = 451 nm. The TPPy powder (B), which was obtained by thermal annealing of TPPy powder (A) in a quartz tube in nitrogen, showed green fluorescence with λ max  = 510 nm. Furthermore, the TPPy powder (B) was reversibly converted into TPPy powder (A) by recrystallization. We conclude that TPPy dimers form locally in the TPPy monomer aggregates during thermal annealing and redissociate into the monomer states during recrystallization.

[1]  T. Tsutsui,et al.  Switchable organic electroluminescence , 2002 .

[2]  C. Tang.  Two‐layer organic photovoltaic cell , 1986 .

[3]  Dago M. de Leeuw,et al.  Field-effect transistors made from solution-processed organic semiconductors , 1997 .

[4]  Y. Takanishi,et al.  Grazing Incidence In-Plane X-Ray Diffraction Study on Oriented Copper Phthalocyanine Thin Films , 2002 .

[5]  T. Jackson,et al.  Stacked pentacene layer organic thin-film transistors with improved characteristics , 1997, IEEE Electron Device Letters.

[6]  C. Tang,et al.  Organic Electroluminescent Diodes , 1987 .

[7]  R. Loutfy,et al.  Purification and characterization of phthalocyanines , 1982 .

[8]  Zhenan Bao,et al.  Soluble and processable regioregular poly(3‐hexylthiophene) for thin film field‐effect transistor applications with high mobility , 1996 .

[9]  Kazuhiro Kudo,et al.  Device Characteristics of Organic Static Induction Transistor Using Copper Phthalocyanine Films and Al Gate Electrode , 1999 .

[10]  Chihaya Adachi,et al.  Electroluminescence of 2,4-bis(4-(2′-thiophene-yl)phenyl)thiophene in organic light-emitting field-effect transistors , 2005 .

[11]  Heinz von Seggern,et al.  Light-emitting field-effect transistor based on a tetracene thin film. , 2003, Physical review letters.

[12]  Theo Siegrist,et al.  Physical vapor growth of centimeter-sized crystals of α-hexathiophene , 1997 .

[13]  Kaname Ito,et al.  Organic thin-film transistors based on anthracene oligomers , 2004 .

[14]  Chihaya Adachi,et al.  Simple Accurate System for Measuring Absolute Photoluminescence Quantum Efficiency in Organic Solid-State Thin Films , 2004 .

[15]  Stephen R. Forrest,et al.  Long-range absorption enhancement in organic tandem thin-film solar cells containing silver nanoclusters , 2004 .

[16]  J. Rogers,et al.  Elastomeric Transistor Stamps: Reversible Probing of Charge Transport in Organic Crystals , 2004, Science.

[17]  Yoshiaki Oku,et al.  Lateral organic light-emitting diode with field-effect transistor characteristics , 2005 .

[18]  Haruo Tanaka,et al.  Switching effect in Cu:TCNQ charge transfer-complex thin films by vacuum codeposition , 2003 .

[19]  H. Sumi.  Two kinds of excimers in α-perylene and pyrene crystals: Origin of Y and V emissions , 1989 .

[20]  Liping Ma,et al.  Organic bistable light-emitting devices , 2002 .

[21]  C. Adachi,et al.  Extremely low-voltage driving of organic light-emitting diodes with a Cs-doped phenyldipyrenylphosphine oxide layer as an electron-injection layer , 2005 .

[22]  Stephen R. Forrest,et al.  High-efficiency organic electrophosphorescent devices with tris(2-phenylpyridine)iridium doped into electron-transporting materials , 2000 .