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| 1 | Structural and luminescence enhancement properties of Eu^(3+)/Ag nanocrystallites doped SiO_2-TiO_2 matrices显示文摘We reported here the structural and optical characterisation of silver nanocrystallites/Eu3+ :SiO2-TiO2 matrices synthesised through sol-gel route. Structural characterisations were done by using energy dispersive spectroscopy (EDX), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), atomic force microscope (AFM) and transmission electron microscopy (TEM) measurements and optical characterisations were performed by absorption and emission spectroscopy. The TEM and XRD measurements confirmed the presence of nanocrystals. A broad absorption band was observed due to surface plasmon resonance of silver nanocrystals. The effect of silver nanocrystals on the emission spectrum of Eu3+ doped SiO2-TiO2 matrices was discussed. An attempt was made to explain this fluorescence enhancement by invoking phenomena such as energy transfer, asymmetry ratio, surface plasmon, surface roughness, crystallinity and grain boundary. Our analysis, based on the experimental results, suggested that all the phenomena except crystallinity and grain boundary had favourable effects on fluorescence enhancement. We also estimated the relevant parameters associated with the phenomena that affected the fluorescence emission from the Eu3+ ions in the matrix. It was seen that the theoretical estimate of fluorescence enhancement agreed well with the experimental estimate. | Arun Kumar K V Revathy K P Prathibha Vasudevan Sunil Thomas Biju P R Unnikrishnan N V | 2013 | Journal of Rare Earths2013，31，5： | 2 |
| 2 | Connected component labelling Using quadtrees-a bottom-up approach显示文摘 | UNNIKRISHNAN A VENKATESH Y V SHANKAR P | 1987 | The Computer Journal1987，30，2： | 1 |
| 3 | Distribution of organophosphorus pesticides in the bed sediments of a backwater system located in an agricuhural watershed: influence of seasonal intrusion ofseawater 显示文摘 | Babu V Unnikrishnan P Anu G | 2011 | Archives Environmental Contamination and Toxicology2011，60，5： | 1 |
| 4 | A comparative study on mechanical properties of sisal-leaf fibre-reinforced polyester composites prepared by resin transfer and compression moulding techniques显示文摘 | SREEKUMAR P A JOSEPH K UNNIKRISHNAN G | 2007 | Composites Science and Technology2007，67，34： | 1 |
| 5 | A comparative study on mechanical properties of sisal-leaf fibre-reinforced polyester composites prepared by resin transfer and compression moulding techniques显示文摘 | Sreekumar P A Kuruvilla Joseph Unnikrishnan G Sabu Thomas | 2007 | Composites Science and Technology2007，67，34： | 1 |
| 6 | Anesthetic management for a hypertensive patent ductus arteriosus (PDA) closure in a patient with surgically uncorrectable long segment right pulmonary artery hypoplasia and a vemricular septal defect 显示文摘 | Neema P K Unnikrishnan M Sinha P K Rathod R C | 2003 | J Cardiothorac Vasc Anesth2003，17，： | 1 |
| 7 | HZSM-5 catalyzed cyclodehydration of diethylene glycol and its derivatives 显示文摘 | Anil W Muthukumaru P S Unnikrishnan S | 1996 | J Mol Catal A: Chemical1996，109，2： | 1 |
| 8 | Surface-modified sisal fiber-reinforced eco-friendly composites:Mechanical,thermal,and diffusion studies显示文摘 | Sreekumar P A Kuruvilla Joseph Unnikrishnan G | | 0，，01： | 1 |
| 9 | Third order nonlinear optical studies in europium naphthalocyanine using degenerate four wave mixing and z-scan显示文摘 | Thomas Jayan Nampoori V P N | 2002 | Optics Communications2002，204，： | 1 |
| 10 | Sensitized fluorescence of Ce^3+/Mn^2+ system in phosphate glass 显示文摘 | Paulose P I Jose G Thomas V Unnikrishnan N V Warrier M | 2003 | Journal of Physics And Chemistry of Solids2003，64，5： | 1 |
| 11 | The monsooncurrents in the north Indian Ocean显示文摘 | SHANKAR D VINAYACHANDRAN P N UNNIKRISHNAN A S | 2002 | Progress in Oceanography2002，52，1： | 1 |
| 12 | A lopex: A correlation-based learning algorithm for feedforward and recurrent neural networks显示文摘 | Unnikrishnan K P | 1994 | Neural Computation1994，6，： | 1 |
| 13 | Third order nonlinear optical studies in europium naphthalocyanine using degenerate four wave mixing and Z-scan显示文摘 | Unnikrishnan K P Thomas Jayan Nampoori V P N | 2002 | Optics Communication2002，204，16： | 1 |
| 14 | Alopex: a Correlation-based Learning Algorithm for Feed-forward and Recurrent Neural Networks 显示文摘 | Unnikrishnan K P Venugopal K P | 1994 | Neural Computation1994，6，3： | 1 |
| 15 | Degenerate four wave mixing in some metal phthalocyanines and naphthalocyanines显示文摘 | Unnikrishnan K P Thomas J Nampoori V P N | 2002 | Chemical Physics2002，279，23： | 1 |
| 16 | Discovering frequent episodes and learning Hidden Markov Models : A formal connection 显示文摘 | Laxman S Sastry P S Unnikrishnan K P | 2005 | IEEE Transactions on Knowledge and Data Engineering2005，17，11： | 1 |
| 17 | Control of infestation on dry fish by pyrethrum treatment on commercial containers显示文摘 | Unnikrishnan Nair T S Mathen C Ravindranathan Nair P | 1994 | Fishery Technology1994，31，： | 1 |
| 18 | 显示文摘 | Endalkachew S D | 2003 | New J Chem2003，27，： | 1 |
| 19 | 显示文摘 | Endalkachew S D | 2002 | Chem Commun2002，，： | 1 |
| 20 | Electrochemically synthesized Pt-MnO2 composite particles for simultaneous determination of catechol and hydroquinone显示文摘 | Unnikrishnan B Ru P L Chen M | | 0，，： | 1 |
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