[20p-W321-1~13] Progress in studies on laser-processing employing liquid media

[20p-W321-6] Nanoparticle synthesized by laser process and the use of optoelectrical devices

〇Ken-ichi Saitow^1,2 (1.N-BARD, Hiroshima Univ., 2.Grad. Sch. Sci., Hiroshima Univ.)

Keywords:quantum dot,LED,photovoltaic

In the past studies, we reported RGB or white-light-continuum photoluminescence of silicon (Si) nanoparticle (NP), SERS-active gold nanomaterials (nanoneckless, fractal networks, microspheres), all of which were fabricated by the pulsed laser ablation (PLA) in supercritical fluid. Recently, we synthesized the colloidal solution of Si quantum dots (QD) by the PLA in solution. Using the colloidal Si-QDs and conductive polymer solution, a hybrid light-emitting diode (LED) was developed by solution processes. As a result, the electroluminescence spectrum of Si-QDs was firstly observed in a blue wavelength region. In addition, current density and optical power density of the hybrid LED were 280 times and 350 times higher than those of previously reported values, respectively. As another topic, the Si-NPs were used as material for the hybrid photovoltaic. By adding the Si-NPs into organic polymer (P3HT) solution, 50- and 12-fold enhancement of the hole mobility and hole density, respectively, was achieved in a Si-NC/P3HT hybrid film. Such a hybrid LED and/or hybrid photovoltaic has been expected as a next-generation optoelectrical device because of good stability, flexible, and facile solution process. Note that these noble hybrid devices are accomplished using the nanomaterials synthesized by the PLA in solution