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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 | Touraine Solente Gole syndrome: the disease and associated tongue fissuring 显示文摘 | Athappan G Unnikrishnan A Chengat V | 2009 | Rheumatol Int2009，29，9： | 1 |
| 4 | 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 |
| 5 | Cooperative sensing for primary detection in cognitive radio 显示文摘 | Unnikrishnan J Veeravalli V | 2008 | IEEE J Sel Topics Signal Process2008，2，1： | 1 |
| 6 | Cooperative Sensing for Primary Detection in Cognitive Radio显示文摘 | Unnikrishnan J Veeravalli V V | | 0，，01： | 1 |
| 7 | Black Silicon Method X:a Review on High Speed and Selective Plasma Etching of Silicon with Profile Control:an In-depth Comparison Between Bosch and Cryostat DRIE Processes As a Roadmap to Next Generation Equipment,Topical Review显示文摘 | Jansen H V de Boer M J Unnikrishnan S | 2009 | J Micromech Microeng2009，19，03： | 1 |
| 8 | Hazardous chemicals in foods显示文摘 | Unnikrishnan V Nath B S | 2002 | Indian Dairy Biosci2002，，11： | 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 | TSH receptor antibod- ies in subjects with type 1 diabetes rnellitus 显示文摘 | Unnikrishnan AG Kumaravel V Nair V | 2006 | Ann N Y Acad Sei2006，1079，： | 1 |
| 12 | Cooperative sensing for primary detection in cognitive radio显示文摘 | UNNIKRISHNAN J VEERAVALLI V | 2008 | IEEE Journal of Selected Topics in Signal Processing2008，2，1： | 1 |
| 13 | Ratiocinative Approach to Ignition Transient Modeling in Solid Rockets显示文摘 | Sanal Kumar V R Unnikrishnan C | 2004 | AIAA2004，4056，： | 1 |
| 14 | 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 |
| 15 | Algo-rithms for dynamic spectrum access with learning for cognitiveradio 显示文摘 | Jayakrishnan Unnikrishnan Venugopal V Veeravalli | 2010 | IEEE Transactions on Signal Processing2010，58，2： | 1 |
| 16 | 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 |
| 17 | Cooperative Sensing for Primary Detection in Cognitive Radio显示文摘 | UNNIKRISHNAN J VEERAVALLI V V | 2008 | IEEE JournaI on Selected Topics in Signal Processing2008，2，1： | 1 |
| 18 | Cooperative sensing for primary detection in cognitive radio显示文摘 | Unnikrishnan J Veeravalli V | 2008 | IEEE Journal on Selected Areas in Signal Processing2008，2，1： | 1 |
| 19 | Drugs affecting HbAlc levels显示文摘 | Unnikrishnan R Anjana RM Mohan V | 2012 | Indian Journal of Endocrinology and Metabolism2012，16，4： | 1 |
| 20 | Isopropylation of naphthalene over modified HMCM-41, HY and SAPO-5 catalysts 显示文摘 | Kamalakar G Kulkarni S J Raghavan K V Unnikrishnan S Halgeri A B | 1999 | Journal of Molecular Catalysis A: Chemical1999，149，： | 1 |
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