PMID- 20980015
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20110311
LR  - 20101108
IS  - 1095-7103 (Electronic)
IS  - 0021-9797 (Linking)
VI  - 353
IP  - 2
DP  - 2011 Jan 15
TI  - Solid state white light emitting systems based on CeF3: RE3+ nanoparticles and 
      their composites with polymers.
PG  - 445-53
LID - 10.1016/j.jcis.2010.10.005 [doi]
AB  - A series of doped CeF(3): RE(3+) (RE(3+): Tb(3+), Eu(3+) and Dy(3+)) 
      nanoparticles were synthesized, with the aim of obtaining a white light emitting 
      composition, by a simple polyol route at 160 degrees C and characterized by X-ray 
      diffraction (XRD), high resolution transmission electron microscopy (HR-TEM), 
      Fourier transform infrared spectroscopy (FT-IR) and photoluminescence. Uniformly 
      distributed and highly water-dispersible rectangular nanoparticles (length ~15-20 
      nm, breadth ~5-10 nm) were obtained. The steady state and time resolved 
      luminescence studies confirmed efficient energy transfer from the host to 
      activator ions. Lifetime studies revealed that optimum luminescence is observed 
      for 2.5 mol% Dy(3+) and 7.5 mol% Tb(3+). The energy transfer efficiencies (Ce(3+) 
      to activators) were found to be 89% for CeF(3): Tb(3+) (7.5 mol%) nanoparticles 
      and 60% for CeF(3): Dy(3+) (2.5 mol%) nanoparticles. Different concentrations of 
      Tb(3+), Eu(3+) and Dy(3+) were doped to achieve a white light emitting phosphor 
      for UV-based LEDs (light emitting diodes). Finally CeF(3), triply doped with 2.0 
      mol%Tb(3+), 4.5 mol% Eu(3+) and 3.5 mol% Dy(3+), was found to have impressive 
      chromaticity co-ordinates, close to broad day light. The colloidal solutions of 
      doped CeF(3) nanoparticles emitted bright green (Tb(3+)), blue (Dy(3+)) and white 
      (triply doped) luminescence upon host excitation. Composites of poly methyl 
      methacrylate (PMMA) and poly vinyl alcohol (PVA) were made with CeF(3): 5.0 
      mol%Tb(3+), CeF(3): 5.0 mol% Dy(3+) and triply doped white light emitting 
      composition. The CeF(3)/PMMA (PVA) nanocomposite films, so obtained, are highly 
      transparent (in the visible spectral range) and exhibit strong photoluminescence 
      upon UV excitation.
CI  - Copyright (c) 2010 Elsevier Inc. All rights reserved.
FAU - Sayed, Farheen N
AU  - Sayed FN
AD  - Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
FAU - Grover, V
AU  - Grover V
FAU - Dubey, K A
AU  - Dubey KA
FAU - Sudarsan, V
AU  - Sudarsan V
FAU - Tyagi, A K
AU  - Tyagi AK
LA  - eng
PT  - Journal Article
DEP - 20101025
PL  - United States
TA  - J Colloid Interface Sci
JT  - Journal of colloid and interface science
JID - 0043125
EDAT- 2010/10/29 06:00
MHDA- 2010/10/29 06:01
CRDT- 2010/10/29 06:00
PHST- 2010/08/17 00:00 [received]
PHST- 2010/09/28 00:00 [revised]
PHST- 2010/10/01 00:00 [accepted]
PHST- 2010/10/29 06:00 [entrez]
PHST- 2010/10/29 06:00 [pubmed]
PHST- 2010/10/29 06:01 [medline]
AID - S0021-9797(10)01169-0 [pii]
AID - 10.1016/j.jcis.2010.10.005 [doi]
PST - ppublish
SO  - J Colloid Interface Sci. 2011 Jan 15;353(2):445-53. doi: 
      10.1016/j.jcis.2010.10.005. Epub 2010 Oct 25.