Synthesis, characterization and luminescent properties of novel red emitting phosphor Li3Ba2Ln3(MoO4)8:Eu3+ (Ln = La, Gd and Y) for white light-emitting diodes

Chongfeng Guo*, Fei Gao, Lifang Liang, Byung Chun Choi, Jung Hyun Jeong

*Corresponding author for this work

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Intense red emitting phosphors Li3Ba2Ln3(MoO4)8:Eu3+ (Ln = La, Gd and Y) have been prepared by sol-gel method. The crystallization processes of these phosphor precursors have also been characterized by X-ray diffraction (XRD) and thermogravimetry-differential thermal analysis (TG-DTA). The properties of these resulting phosphors are characterized by photoluminescence (PL) spectra and reflectance spectra in a comparable way. In addition, environmental scanning electron microscopy (ESEM) is used to characterize the shape and size distribution of the phosphors. The results of TG-DTA and XRD indicate that all of the Li3Ba2Ln3(MoO4)8:Eu3+ (Ln = La, Gd and Y) phosphors crystallize completely at about 550 °C, and they all adopt the monoclinic structure in the range of our experiments. The luminescent properties of these phosphors are also similar. The excitation (PLE) spectra of phosphors Li3Ba2Ln3(MoO4)8:Eu3+ (Ln = La, Gd and Y) are mainly attributed to O → Mo charge-transfer (CT) band at about 295 nm and some sharp lines of Eu3+ transitions in near-UV and visible regions, and the two strongest absorption lines at 395 nm and 465 nm are comparative. For all of Li3Ba2Ln3(MoO4)8:Eu3+ (Ln = La, Gd and Y) phosphors, intense red emissions peaked at 616 nm assigned to 5D0 7F2 transition of Eu3+ are obtained under the excitation of ∼394 nm and ∼465 nm light, which indicates that these phosphors may serve as potential red phosphor candidate for near-UV and blue LEDs.

Original languageEnglish
Pages (from-to)607-612
Number of pages6
JournalJournal of Alloys and Compounds
Volume479
Issue number1-2
DOIs
Publication statusPublished - 24 Jun 2009

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Keywords

  • Luminescence
  • Optical materials
  • Optical properties
  • Sol-gel processes

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