TAILIEUCHUNG - Báo cáo hóa học: " Enhanced Luminescence of Eu-Doped TiO2 Nanodots"

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: Enhanced Luminescence of Eu-Doped TiO2 Nanodots | Nanoscale Res Lett 2009 4 809-813 DOI S11671-009-9319-5 NANO EXPRESS Enhanced Luminescence of Eu-Doped TiO2 Nanodots Ming Luo Kui Cheng Wenjian Weng Chenlu Song Piyi Du Ge Shen Gang Xu Gaorong Han Received 19 February 2009 Accepted 6 April 2009 Published online 25 April 2009 to the authors 2009 Abstract Monodisperse and spherical Eu-doped TiO2 nanodots were prepared on substrate by phase-separation-induced self-assembly. The average diameters of the nanodots can be 50 and 70 nm by changing the preparation condition. The calcined nanodots consist of an amorphous TiO2 matrix with Eu3 ions highly dispersed in it. The Eu-doped TiO2 nanodots exhibit intense luminescence due to effective energy transfer from amorphous TiO2 matrix to Eu3 ions. The luminescence intensity is about times of that of Eu-doped TiO2 film and the luminescence lifetime can be as long as 960 s. Keywords TiO2 Eu3 Nanodots Phase-separation-induced self-assembly Luminescence Introduction It is well-known that rare earth RE ions can exhibit rich spectral properties 1-4 . The direct excitation of the RE ions is inefficient because of parity-forbidden f-f transitions. Therefore host materials are required to excite the RE ions efficiently in a wide spectral range for realizing their full potential in optoelectronic devices and flat panel displays 5 6 . For these applications inorganic oxide materials exhibit superior advantages in terms of their good M. Luo K. Cheng W. Weng El C. Song P. Du G. Shen G. Xu G. Han Department of Material Science and Engineering State Key Laboratory of Silicon Materials Zhejiang University Hangzhou 310027 People s Republic of China e-mail wengwj@ chemical thermal and mechanical properties 7-9 . For example Y2O3 Eu is one red emitting phosphor compound commonly used 7 10-12 . However high costs prevent its further developments. As one of the recently developed alternative oxide host materials titanium oxide TiO2 is demonstrated to be a good sensitizer to

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