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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 | Literal Approximations to Aircraft Dynamic Modes显示文摘 | Ananthkrishnan N Suraj Unnikrishnan | 2001 | Journal of Guidance Control and Dynamics2001，24，6： | 1 |
| 3 | 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 |
| 4 | Behavior of Reinforced Clay Under Monotonic and Cyclic Loading 显示文摘 | UNNIKRISHNAN N RAJAGOPAL K KRISH-NASWAMY N R | 2002 | Geotextiles and Geomembranes2002，20，2： | 1 |
| 5 | 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 |
| 6 | 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 |
| 7 | 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 |
| 8 | Complete heart block during central venous catheter placement in a patient with pre-existing left bundle branch block 显示文摘 | Unnikrishnan D Idris N Varshneya N | 2003 | Br J Anaesth2003，91，： | 1 |
| 9 | 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 |
| 10 | A conservative treatment approach to replacing a missing anterior tooth显示文摘 | Singh K Gupta N Unnikrishnan N | 2014 | Case Rep Dent2014，2014，： | 1 |
| 11 | Complete bert block during central venous catheter placement in a patient with pro-existing left bundle branch block显示文摘 | Unnikrishnan S Idris N Varshneya N | | 0，，： | 1 |
| 12 | Inhibition of nitrite induced oxidation of hemoglobin by curcuminoids 显示文摘 | Unnikrishnan M K Rao M N | 1995 | Pharmazie1995，50，7： | 1 |
| 13 | Bayesian Analysis for Randomized Response Models显示文摘 | Unnikrishnan N K Kunte S | 1999 | Sankhyā:The Indian Journal of Statistics Series B1999，61，3： | 1 |
| 14 | Torsadesdepointes in 3 patients with leukemia treated with arsenic trioxide显示文摘 | UNNIKRISHNAN D DUTCHER J P VARSHNEY-A N | 2001 | Blood2001，97，： | 1 |
| 15 | Accuracy considerations in a 3-D ultrasonic positioning system based on the difference in time of flights 显示文摘 | Unnikrishnan N Kumar R P Mahajan A | 2002 | Journal of Dynamic Systems Measurement and Control2002，124，4： | 1 |
| 16 | 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 Worrier M K R | 2003 | Journal of Physics and Chemistry of Solids2003，64，5： | 1 |
| 17 | The monsoon currents in the north Indian Ocean显示文摘 | SHANKAR D VINAYACHANDRAN P N UNNIKRISHNAN A S | 2002 | Progress in Oceanography2002，52，： | 1 |
| 18 | Torsades de pointes in 3 patients with leukemia treated with arsenic trioxide 显示文摘 | Unnikrishnan D Dutcher JP Varshneya N | 2001 | Blood2001，97，5： | 1 |
| 19 | Effect of radioiodine therapy on pulmonary alveolar-capillary membrane integrity显示文摘 | Samuel A M Unnikrishnan T P Baghel N S | 1995 | J Nucl Medi1995，36，5： | 1 |
| 20 | Tidal asymmetry in the Mandovi and Zuari Estuaries, the West Coast of India 显示文摘 | Manoj N T Unnikrishnan A S Sundar D | 2009 | Journal of Coastal Research2009，25，6： | 1 |
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