Document Detail


Enhancement of green-light photoluminescence of Ta(2)O(5) nanoblock stacks.
MedLine Citation:
PMID:  21709873     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
In this study we have explored the structural, electronic, and photoluminescence (PL) properties of Ta(2)O(5) nanoblock stacks. The Ta(2)O(5) nanoblocks were synthesized by the hot filament metal-oxide vapor deposition (HFMOVD) technique and randomly arranged in large-area stacks. Field-emission scanning electron microscopy (FESEM) showed most of the stacking Ta(2)O(5) nanoblocks to be 21 nm wide. Energy dispersive spectroscopy (EDS) analysis verified the presence of only the elements Ta and O. X-Ray photoemission spectroscopy (XPS) not only revealed the electronic structures and chemical properties of the stacking Ta(2)O(5) nanoblocks but also their stoichiometric Ta/O ratio of ∼0.416 (i.e. Ta : O = 2.08 : 5). Photoluminescence (PL) spectroscopy showed very strong green-light emissions, which emerged from the trap-levels of the oxygen vacancies within the Ta(2)O(5) bandgap. The PL intensities were linearly enhanced by increasing the laser power and the excitation time. The PL results suggest that the nanoblocks are excellent visible-light emitters.
Authors:
Rupesh S Devan; Ching-Ling Lin; Shun-Yu Gao; Chia-Liang Cheng; Yung Liou; Yuan-Ron Ma
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-6-27
Journal Detail:
Title:  Physical chemistry chemical physics : PCCP     Volume:  -     ISSN:  1463-9084     ISO Abbreviation:  -     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-6-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100888160     Medline TA:  Phys Chem Chem Phys     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Physics, National Dong Hwa University, No. 1, Sec. 2, Da-Hsueh Rd., Shou-Feng, Hualien 97401, Taiwan, Republic of China. ronma@mail.ndhu.edu.tw.
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