CHEM01200604004 Shri Sanyasinaidu Boddu - Homi Bhabha ...

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4.2 Studies on GaPO 4 and lanthanide ions containing GaPO 4 nanomaterials ……. 104 4.2.1 XRD, FT-IR and TEM study ………………………………………... 104 4.2.2 Luminescence studies ………………………………………………. 106 4.2.3 31 P MAS NMR studies ……………………………………………… 109 4.3 Studies on Antimony phosphate nanomaterials ……………………………….. 113 4.3.1 Effect of ethylene glycol to glycerol ratio on size and shape of SbPO 4 :Ln nanomaterials ……………………………………………. 113 4.3.2 Luminescence studies on SbPO 4 :Ln nanoparticles/nanoribbons ………. 117 4.3.3 Studies on Ce 3+ co-doped SbPO 4 :Tb 3+ nanomaterials and their dispersion in silica ………………………………………………………. 122 4.3.4 Proof for the incorporation of lanthanide ions into SbPO 4 lattice ………. 123 4.3.5 Luminescence studies on SbPO 4 :Ce, Tb and effect of incorporation of nanomaterials in silica …………………………………………………. 126 4.4 Bismuth phosphate nanomaterials ……………………………………………… 133 4.4.1 Effect of reaction temperature on the particle size, shape and crystal structure …………………………………………………………. 133 4.4.2 Effect of particle size and crystal structure on Eu 3+ emission from BiPO 4 :Eu 3+ nanomaterials ……………………………………………….. 137 4.4.3 Solid solution formation between bismuth and lanthanide phosphates …. 138 4.4.4 Luminescence studies on Eu 3+ doped BiPO 4 nanomaterials …………….. 142 4.4.5 Luminescence studies on Tb 3+ doped BiPO 4 nanorods ………………….. 143 4.4.6 Energy transfer from Tb 3+ ions to Eu 3+ ions in Tb 3+ co-doped BiPO 4 :Eu 3+ nanorods …………………………………………………….. 144 4.4.7 Luminescence studies on Dy 3+ doped BiPO 4 nanorods ………………….. 145 4.4.8 Luminescence studies on Sm 3+ doped BiPO 4 nanorods …………………. 147 x
CHAPTER 5: Zinc Gallate ................................................................................. 149 - 164 5.1 Introduction ……………………………………………………………………… 149 5.2 Effect of ethylene glycol (EG) - H 2 O solvent ratio on particle size and photoluminescence of ZnGa 2 O 4 nanoparticles …………………………………... 150 5.3 Effect of precursor concentration on particle size ……………………………….. 154 5.4 Effect of Indium doping on crystallinity and photoluminescence of ZnGa 2 O 4 …. . 158 5.5 Photoluminescence from lanthanide doped ZnGa 2 O 4 nanoparticles ……………... 161 5.5.1 Ce 3+ doped ZnGa 2 O 4 nanoparticles ………………………………………… 161 5.5.2 Eu 3+ doped ZnGa 1.5 In 0.5 O 4 nanoparticles ........................................................ 163 5.5.3 Tb 3+ doped ZnGa 1.5 In 0.5 O 4 nanoparticles ........................................................ 164 CHAPTER 6: Tungstates ....................................................................................... 165 - 179 6.1 Introduction ……………………………………………………………………… 165 6.2 Effect of nature of metal ion on the particle size ………………………………... 166 6.3 Effect of metal ion on luminescence of MWO 4 :Eu 3+ nanoparticles ……………... 168 6.4 Luminescence studies on un-doped CaWO 4 nanoparticles ……………………… 170 6.5 Effect of heat treatment on particle size …………………………………………. 171 6.6 Effect of particle size on photoluminescence of CaWO 4 nanoparticles …………. 172 6.7 Luminescence studies on Tb 3+ doped CaWO 4 nanoparticles ……………………. 174 6.8 Luminescence studies on Dy 3+ doped CaWO 4 nanoparticles ……………………. 175 6.9 Luminescence studies on Sm 3+ doped CaWO 4 nanoparticles ……………………. 176 6.10 Luminescence studies on Er 3+ doped CaWO 4 nanoparticles ………………….... 178 CHAPTER 7: Summary and Conclusions ........................................................... 180 - 184 References .............................................................................................................. 185 - 201 List of Publications ................................................................................................ 202 - 205 xi
Page 1 and 2: SYNTHESIS AND CHARACTERIZATION OF L
Page 3 and 4: STATEMENT BY AUTHOR This dissertati
Page 5 and 6: Dedicated to ……… My beloved b
Page 7 and 8: also thankful to all the members of
Page 9: 2.3 Synthesis of binary oxide nanom
Page 13 and 14: imaging, scintillators, lasers, etc
Page 15 and 16: morphology by heating at 500 and 90
Page 17 and 18: nanoparticles having hexagonal stru
Page 19 and 20: 100°C and 185°C, respectively in
Page 21 and 22: into poly methyl methacryllate (PMM
Page 23 and 24: 3. N. M. Dimitrijevic, Z. V. Saponj
Page 25 and 26: Fig.13: Fig.14: (a) Simplified ray
Page 27 and 28: Eu 3+ ions after heat treatment at
Page 29 and 30: 615 nm Fig.50: FT-IR patterns (a) a
Page 31 and 32: area electron diffraction pattern a
Page 33 and 34: different amounts of Eu 3+ . Fig.86
Page 35 and 36: and 545 nm, respectively. Fig.106:
Page 37 and 38: List of Tables: Table 1: Variation
Page 39 and 40: CHAPTER 1: Introduction 1.1 Histori
Page 41 and 42: Rods, cylinders, wires and tubes ar
Page 43 and 44: must be supersaturated either by di
Page 45 and 46: - + - + charge stabilized nanoparti
Page 47 and 48: exothermic reaction between the met
Page 49 and 50: constant, ħ is h/2π, e is the ele
Page 51 and 52: these platinum complexes have been
Page 53 and 54: (IR), visible and ultra-violet (UV)
Page 55 and 56: in Ce 3+ , Pr 3+ , Tb 3+ and CT abs
Page 57 and 58: assisted by lattice phonons of appr
Page 59 and 60: decay-time reduction is much easier
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nanocrystals is shown in Fig.10 [58
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depends strongly on the nature of t
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corresponding emission and excitati
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doped nanomaterials of the above me
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will be formed and subsequently it
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Eu 3+ ions were also subjected to s
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transferred into a two-necked RB fl
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Where λ is the wavelength of X-ray
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Micro-structural characterization b
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electrons (i.e. diffraction mode).
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diffraction spots. By tilting a cry
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surface. The contact mode can obtai
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three types lines in the scattered
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solids tend to be broadened because
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sample fluoresce. The fluorescent l
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pulse frequency) as excitation sour
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Lanthanide ions doped Ga 2 O 3 nano
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atoms at three corners and the lone
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Figure 19 (a-d) shows SEM images of
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Based on these results, it can be i
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almost normal to the equatorial pla
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Table 2. Summary of important modes
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systematic disappearance of these t
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comparison, Eu 3+ ions alone in wat
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the samples, suggesting that Eu 3+
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These inferences are further substa
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Similar DTA peaks have been reporte
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GaOOH samples doped with different
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The cell parameters increases with
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strong emission compared to corresp
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curves are shown in Fig.39. Lifetim
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Similar results are also observed f
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intensity of XRD peaks correspond t
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compared to the bulk material and a
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is almost 1½ times that of peak B1
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3.8 Interaction of Eu 3+ ions with
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The spectrum shows strong emission
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The decay curves are found to be bi
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As prepared undoped Sb 2 O 3 sample
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Intensity(arb.units) 1.0 0.8 0.6 0.
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3+ having surface lanthanide ions.
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diffraction patterns from the GaPO
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5 D 0 7 F 2 level to 7 F 7 7 1 , F
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The second possibility is the excha
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chemical shift anisotropy is much h
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not have strong interaction with th
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(001) (110) (011) (101) (020) (101)
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growth centre compared to higher vi
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observed after excitation at 250 an
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3+ 3+ concentration quenching. Tb l
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Compared to the selected area elect
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lattice. Lanthanide ions occupying
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obtained after 275 nm excitation is
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The luminescence dynamics associate
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that the broad peak can be resolved
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espectively. Value of this integral
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ethylene glycol moiety (stabilizing
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Room temperature and 100°C synthes
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heavier metal ion as compared to La
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Similar studies were also carried o
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3+ 3+ faster decay component is ass
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the other hand the Eu 3+ lifetime h
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3+ 4.4.8 Luminescence studies on Sm
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CHAPTER 5: Zinc gallate (ZnGa 2 O 4
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In pure EG an amorphous product is
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water content in the reaction mediu
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nucleation, thereby leading to incr
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particles. Thus the TEM studies als
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value. The lattice parameters calcu
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Quantum yield of the blue emission
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5.5.2. Eu 3+ doped ZnGa 1.5 In 0.5
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CHAPTER 6: Tungstates [MWO 4 (M = C
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ionic radius of the metal cation ca
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lattice. Asymmetric ratio is ~ 12 f
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700 Intensity (arb.units) 600 λ ex
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Intensity (arb.units) 25000 20000 1
Page 213 and 214:
Strong green emission has been obse
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consists of strong band at 255 nm a
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peak can be attributed to the cryst
Page 219 and 220:
nm) is observed from Er 3+ doped Ga
Page 221 and 222:
and Dy 3+ doped CaWO 4 nanoparticle
Page 223 and 224:
REFERENCES 1. D. J. Barber, I. C. F
Page 225 and 226:
32. K. A. Gschneidner, Jr., L. Eyri
Page 227 and 228:
65. Z. Deng, F. Tang, D. Chen, X. M
Page 229 and 230:
100. A. Rouanel, J. J. Serra, K. Al
Page 231 and 232:
130. F. Li, W. Jianhuai, L. Jiongti
Page 233 and 234:
166. L. Fu, Z. Liu, Y. Liu, B. Han,
Page 235 and 236:
205. R. Sasikala, V. Sudarsan, C. S
Page 237 and 238:
238. E. Oldfield, R. A. Kinsey, K.
Page 239 and 240:
271. B. G. Hyde, S. Andersson, ”I
Page 241 and 242:
B. S. Naidu, B. Vishwanadh, V. Suda
Page 243:
9. Room temperature synthesis of mu
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CHEM01200604004 Shri Sanyasinaidu Boddu - Homi Bhabha ...

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