Two-Photon Excited Fluorescence and Second-Harmonic Generation of the DAST Organic Nanocrystals

The nonlinear optical properties of the size-controlled trans-4-[4-(dimethylamino)-N-methylstilbazolium] p-tosylate (DAST) organic nanocrystals (ONCs) have been investigated. The size and monoclinic crystal structure have been demonstrated by the scanning electron microscope, transmission electron microscope, and X-ray diffraction measurement. The DAST ONCs exhibited 6-fold enhanced fluorescence quantum yield and prolonged fluorescence lifetime compared to DAST molecular solution. The evaluations of two-photon excited fluorescence (TPEF) and second-harmonic generation (SHG) microscopes have been implemented for investigating the optical nonlinearities of DAST nanocrystals. The TPEF intensity of DAST ONCs was improved by a factor of 37.3 compared to DAST molecular solution. The extraordinary large two-photon absorption cross section up to 1.72 × 106 GM was observed. DAST ONC was demonstrated as a single crystal from the four-lobe polarization response in the SHG microscope. These results would provide DAST...

[1]  S. D. Hudson,et al.  Quantum mazes: luminescent labyrinthine semiconductor nanocrystals having a narrow emission spectrum. , 2007, ACS nano.

[2]  X. Bu,et al.  Frequency-upconverted organic crystal. , 1999, Optics letters.

[3]  Soo Young Park,et al.  Photoswitchable organic nanoparticles and a polymer film employing multifunctional molecules with enhanced fluorescence emission and bistable photochromism. , 2004, Angewandte Chemie.

[4]  A. Caminade,et al.  A modular approach to two-photon absorbing organic nanodots: brilliant dendrimers as an alternative to semiconductor quantum dots? , 2006, Chemical communications.

[5]  P. Prasad,et al.  Aggregation‐Enhanced Fluorescence and Two‐Photon Absorption in Nanoaggregates of a 9,10‐Bis[4′‐(4″‐aminostyryl)styryl]anthracene Derivative , 2006 .

[6]  Wolfgang Rettig,et al.  Structural changes accompanying intramolecular electron transfer: focus on twisted intramolecular charge-transfer states and structures. , 2003, Chemical reviews.

[7]  J. Zyss,et al.  Nanometric scale investigation of the nonlinear efficiency of perhydrotriphenylene inclusion compounds , 2005 .

[8]  Y. Zhao,et al.  2,4,5-Triphenylimidazole Nanowires with Fluorescence Narrowing Spectra Prepared through the Adsorbent-Assisted Physical Vapor Deposition Method , 2006 .

[9]  Thomas C. Fitzgibbons,et al.  Optimizing the Photocurrent Efficiency of Dye-Sensitized Solar Cells through the Controlled Aggregation of Chalcogenoxanthylium Dyes on Nanocrystalline Titania Films , 2008 .

[10]  Satoshi Kawata,et al.  Dendrimer adjusted nanocrystals of DAST: organic crystal with enhanced nonlinear optical properties. , 2010, Nanoscale.

[11]  S. Okada,et al.  Electric field-induced orientation of organic microcrystals with large dipole moment in dispersion liquid , 2000 .

[12]  S. Charpak,et al.  Water-soluble dendrimeric two-photon tracers for in vivo imaging. , 2006, Angewandte Chemie.

[13]  J. Perry,et al.  Synthesis of organic salts with large second-order optical nonlinearities. , 1994, Science.

[14]  Peter Günter,et al.  Crystal growth and characterization of the organic salt 4-N, N-dimethylamino-4′-N-methyl-stilbazolium tosylate (dast) , 1996 .

[15]  David K. Smith,et al.  Dendritic supermolecules--towards controllable nanomaterials. , 2006, Chemical communications.

[16]  Qidai Chen,et al.  Two-photon excited highly polarized and directional upconversion emission from slab organic crystals. , 2010, Optics letters.

[17]  C. Schlenk,et al.  Silicon-Based Dendrimers , 2000 .

[18]  Takashi Fukuda,et al.  A Novel Method for Fixing the Anisotropic Orientation of Dispersed Organic Nanocrystals in a Magnetic Field , 2005 .

[19]  Yusuke Mori,et al.  Growth of high quality nonlinear optical crystal 4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) , 1999 .

[20]  J. Rieger,et al.  Organic Nanoparticles in the Aqueous Phase-Theory, Experiment, and Use. , 2001, Angewandte Chemie.

[21]  Adela C. Bonoiu,et al.  Aggregation‐Enhanced Fluorescence in Organically Modified Silica Nanoparticles: A Novel Approach toward High‐Signal‐Output Nanoprobes for Two‐Photon Fluorescence Bioimaging , 2007 .

[22]  Soon-Ki Kwon,et al.  Photopatterned arrays of fluorescent organic nanoparticles. , 2007, Angewandte Chemie.

[23]  X. Duan,et al.  Optical gain enhancement using a carbosiloxane dendrimer in dilute solution of rhodamine B. , 2007, Chemphyschem : a European journal of chemical physics and physical chemistry.

[24]  Seth R. Marder,et al.  Synthesis of Organic Salts with Large Second-Order Optical Nonlinearities , 1989, Science.

[25]  Shuji Okada,et al.  SECOND-ORDER HYPERPOLARIZABILITIES OF STILBAZOLIUM CATIONS STUDIED BY SEMIEMPIRICAL CALCULATION , 1996 .

[26]  Koen Clays,et al.  Amphiphilic porphyrins for second harmonic generation imaging. , 2009, Journal of the American Chemical Society.