Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Pulsed-Laser-Induced Simple Synthetic Route for Tb3Al5O12:Ce3+ Colloidal Nanocrystals and Their Luminescent Properties | Nanoscale Res Lett 2009 4 888-895 DOI S11671-009-9331-9 NANO EXPRESS Pulsed-Laser-Induced Simple Synthetic Route for Tb3Al5Oi2 Ce3 Colloidal Nanocrystals and Their Luminescent Properties Sung Wook Mhin Jeong Ho Ryu Kang Min Kim Gyeong Seon Park Han Wool Ryu Kwang Bo Shim Takeshi Sasaki Naoto Koshizaki Received 11 March 2009 Accepted 24 April 2009 Published online 15 May 2009 to the authors 2009 Abstract Cerium-doped Tb3Al5O12 TAG Ce3 colloidal nanocrystals were synthesized by pulsed laser ablation PLA in de-ionized water and lauryl dimethylaminoacetic acid betain LDA aqueous solution for luminescent biolabeling application. The influence of LDA molecules on the crystallinity crystal morphology crystallite size and luminescent properties of the prepared TAG Ce3 colloidal nanocrystals was investigated in detail. When the LDA solution was used smaller average crystallite size narrower size distribution and enhanced luminescence were observed. These characteristics were explained by the effective role of occupying the oxygen defects on the surface of TAG Ce3 colloidal nanocrystal because the amphoteric LDA molecules were attached by positively charged TAG Ce3 colloidal nanocrystals. The blue-shifted phenomena found in luminescent spectra of the TAG Ce3 colloidal nanocrystals could not be explained by previous crystal field theory. We discuss the 5d energy level of Ce3 with decreased crystal size with a phenomenological model that explains the relationship between bond distance with 5d energy level of Ce3 based on the concept of crystal field theory modified by covalency contribution. Keywords TAG Ce3 nanocrystal Pulsed laser ablation LDA Luminescence Blue-shift S. W. Mhin K. B. Shim Division of Materials Science and Engineering Hanyang University 17 Haengdang-Dong Seongdong-Gu Seoul 133-791 South Korea J. H. Ryu H G. S. Park LED Lab R D Institute Samsung LED Co. Ltd. 314 Maetan3-Dong Yeongtong-Gu Suwon Gyunggi-Do 443-743 South Korea e-mail .
