Microwave-assisted sol-gel synthesis and photoluminescence characterization of LaPO4

Eu3+,Li+ nanophosphors

Wei Li, Joonho Lee

Research output: Contribution to journalArticle

84 Citations (Scopus)

Abstract

Here, we describe the fast and mass fabrication of monazite lanthanum orthophosphate (LaPO4) nanoparticles via a simple sol-gel method under the assistance of microwave irradiation. The procedure involves formation of homogeneous, transparent, metal-citrate-EDTA gel precursors using both citric acid (CA) and ethylenediamine tetraacetic acid (EDTA) as the complexing agent followed by microwave irradiation, which promotes prompt thermal decomposition of the metal-citrate-EDTA gel precursors to yield the final nanoparticles. Thermogravimetric/differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM) were used to characterize the as-synthesized nanoparticles. About 23 g of single monoclinic phase, approximately 100 nm diameter, LaPO4 spherical nanoparticles were readily obtained at 800 °C within 0.5 h, and the nanospheres were themselves composed of Ultrafine nanocrystals of a few nanometers in diameter. Furthermore, photoluminescence (PL) characterization of the Li+- and Eu3+-codoped LaPO4 nanocrystals was carried out. The effects of microwave irradiation temperature and Eu3+ active center concentration, especially the doping concentration of Li+ on the PL properties, were elaborated in detail. Room-temperature photoluminescence (PL) characterization revealed that the optical brightness as well as the intensity ratio of 5D0-7F1 to 5D0-7F2 is highly dependent on the Li+ ions concentration. Introduction of 5 mol % Li+ into the crystal structure enhanced the PL emission brightness more than 2-fold, and the Li0.05Eu0.05La0.9PO4 nanophosphor showed the relatively most promising PL performance with the most intense emission.

Original languageEnglish
Pages (from-to)11679-11684
Number of pages6
JournalJournal of Physical Chemistry C
Volume112
Issue number31
DOIs
Publication statusPublished - 2008 Aug 7

Fingerprint

ethylenediamine
Sol-gels
Photoluminescence
Microwaves
gels
Microwave irradiation
photoluminescence
microwaves
Citric Acid
Nanoparticles
synthesis
nanoparticles
citrates
Nanocrystals
acids
irradiation
Acids
Luminance
nanocrystals
brightness

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Microwave-assisted sol-gel synthesis and photoluminescence characterization of LaPO4 : Eu3+,Li+ nanophosphors. / Li, Wei; Lee, Joonho.

In: Journal of Physical Chemistry C, Vol. 112, No. 31, 07.08.2008, p. 11679-11684.

Research output: Contribution to journalArticle

@article{cc06d38e5d1c468ea6793e5d89bbd5dc,
title = "Microwave-assisted sol-gel synthesis and photoluminescence characterization of LaPO4: Eu3+,Li+ nanophosphors",
abstract = "Here, we describe the fast and mass fabrication of monazite lanthanum orthophosphate (LaPO4) nanoparticles via a simple sol-gel method under the assistance of microwave irradiation. The procedure involves formation of homogeneous, transparent, metal-citrate-EDTA gel precursors using both citric acid (CA) and ethylenediamine tetraacetic acid (EDTA) as the complexing agent followed by microwave irradiation, which promotes prompt thermal decomposition of the metal-citrate-EDTA gel precursors to yield the final nanoparticles. Thermogravimetric/differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM) were used to characterize the as-synthesized nanoparticles. About 23 g of single monoclinic phase, approximately 100 nm diameter, LaPO4 spherical nanoparticles were readily obtained at 800 °C within 0.5 h, and the nanospheres were themselves composed of Ultrafine nanocrystals of a few nanometers in diameter. Furthermore, photoluminescence (PL) characterization of the Li+- and Eu3+-codoped LaPO4 nanocrystals was carried out. The effects of microwave irradiation temperature and Eu3+ active center concentration, especially the doping concentration of Li+ on the PL properties, were elaborated in detail. Room-temperature photoluminescence (PL) characterization revealed that the optical brightness as well as the intensity ratio of 5D0-7F1 to 5D0-7F2 is highly dependent on the Li+ ions concentration. Introduction of 5 mol {\%} Li+ into the crystal structure enhanced the PL emission brightness more than 2-fold, and the Li0.05Eu0.05La0.9PO4 nanophosphor showed the relatively most promising PL performance with the most intense emission.",
author = "Wei Li and Joonho Lee",
year = "2008",
month = "8",
day = "7",
doi = "10.1021/jp800101d",
language = "English",
volume = "112",
pages = "11679--11684",
journal = "Journal of Physical Chemistry C",
issn = "1932-7447",
publisher = "American Chemical Society",
number = "31",

}

TY - JOUR

T1 - Microwave-assisted sol-gel synthesis and photoluminescence characterization of LaPO4

T2 - Eu3+,Li+ nanophosphors

AU - Li, Wei

AU - Lee, Joonho

PY - 2008/8/7

Y1 - 2008/8/7

N2 - Here, we describe the fast and mass fabrication of monazite lanthanum orthophosphate (LaPO4) nanoparticles via a simple sol-gel method under the assistance of microwave irradiation. The procedure involves formation of homogeneous, transparent, metal-citrate-EDTA gel precursors using both citric acid (CA) and ethylenediamine tetraacetic acid (EDTA) as the complexing agent followed by microwave irradiation, which promotes prompt thermal decomposition of the metal-citrate-EDTA gel precursors to yield the final nanoparticles. Thermogravimetric/differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM) were used to characterize the as-synthesized nanoparticles. About 23 g of single monoclinic phase, approximately 100 nm diameter, LaPO4 spherical nanoparticles were readily obtained at 800 °C within 0.5 h, and the nanospheres were themselves composed of Ultrafine nanocrystals of a few nanometers in diameter. Furthermore, photoluminescence (PL) characterization of the Li+- and Eu3+-codoped LaPO4 nanocrystals was carried out. The effects of microwave irradiation temperature and Eu3+ active center concentration, especially the doping concentration of Li+ on the PL properties, were elaborated in detail. Room-temperature photoluminescence (PL) characterization revealed that the optical brightness as well as the intensity ratio of 5D0-7F1 to 5D0-7F2 is highly dependent on the Li+ ions concentration. Introduction of 5 mol % Li+ into the crystal structure enhanced the PL emission brightness more than 2-fold, and the Li0.05Eu0.05La0.9PO4 nanophosphor showed the relatively most promising PL performance with the most intense emission.

AB - Here, we describe the fast and mass fabrication of monazite lanthanum orthophosphate (LaPO4) nanoparticles via a simple sol-gel method under the assistance of microwave irradiation. The procedure involves formation of homogeneous, transparent, metal-citrate-EDTA gel precursors using both citric acid (CA) and ethylenediamine tetraacetic acid (EDTA) as the complexing agent followed by microwave irradiation, which promotes prompt thermal decomposition of the metal-citrate-EDTA gel precursors to yield the final nanoparticles. Thermogravimetric/differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM) were used to characterize the as-synthesized nanoparticles. About 23 g of single monoclinic phase, approximately 100 nm diameter, LaPO4 spherical nanoparticles were readily obtained at 800 °C within 0.5 h, and the nanospheres were themselves composed of Ultrafine nanocrystals of a few nanometers in diameter. Furthermore, photoluminescence (PL) characterization of the Li+- and Eu3+-codoped LaPO4 nanocrystals was carried out. The effects of microwave irradiation temperature and Eu3+ active center concentration, especially the doping concentration of Li+ on the PL properties, were elaborated in detail. Room-temperature photoluminescence (PL) characterization revealed that the optical brightness as well as the intensity ratio of 5D0-7F1 to 5D0-7F2 is highly dependent on the Li+ ions concentration. Introduction of 5 mol % Li+ into the crystal structure enhanced the PL emission brightness more than 2-fold, and the Li0.05Eu0.05La0.9PO4 nanophosphor showed the relatively most promising PL performance with the most intense emission.

UR - http://www.scopus.com/inward/record.url?scp=49649117125&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=49649117125&partnerID=8YFLogxK

U2 - 10.1021/jp800101d

DO - 10.1021/jp800101d

M3 - Article

VL - 112

SP - 11679

EP - 11684

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

SN - 1932-7447

IS - 31

ER -