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Chemical Research in Chinese Universities ›› 2011, Vol. 27 ›› Issue (6): 1045-1048.

• Articles • Previous Articles     Next Articles

Preparation of Organic Nanoparticle Colloids by Laser Ablation and Their Nonlinear Optical Properties

YANG Jie1, WANG Rui1, DING Ran1, LI Ai-wu1, YU Yong-sen1, WANG Ji-ping2* and YANG Han1*   

  1. 1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, P. R. China;
    2. Department of Radiology, The First Hospital of Jilin University, Changchun 130021, P. R. China
  • Received:2010-12-30 Revised:2011-03-25 Online:2011-11-25 Published:2011-11-07
  • Contact: YANG Han;WANG Ji-ping E-mail:yanghan@jlu.edu.cn; wangjiping@yahoo.com.cn
  • Supported by:

    Supported by the National High-Tech Research and Development Program of China(No.2009AA03Z401) and the National Natural Science Foundation of China(Nos.61077002, 60807030).

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Abstract: Suspension of micrometer-sized 1,4-bis(4-methylstyryl)benzene(p-MSB) was converted into colloidal nanocrystal solution by irradiation with an femtosecond laser(800 nm, 1 kHz). The prepared nanocrystals were rectangular with ca. 100 nm in size. The same crystal structure as that of bulk crystals was confirmed by X-ray diffraction measurement. UV-Vis spectra and emission spectra of the nanoparticle dispersions in dichloromethane(poor solvent) were examined. The nanocrystal exhibits large quantum yield(89%). The nonlinear optical properties of the nanocrystals were further studied by Z-scan technique with femtosecond laser duration of 120 fs at a wavelength of 800 nm. The results show that the nanocrystals exhibit strong nonlinear absorption.

Key words: Laser ablation, Organic nanocrystal, Nonlinear optical property