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Synthesis and luminescence properties of Ca 3 Ga 2 Si 3 O 12 :RE 3+ (RE = Eu/Tb) powder phosphors
Author(s) -
Bhushana Reddy M.,
Sailaja S.,
Vemasevana Raju K.,
Nageswara Raju C.,
Giridhar P.,
Vengala Rao B.,
Sudhakar Reddy B.
Publication year - 2011
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.1295
Subject(s) - phosphor , photoluminescence , scanning electron microscope , luminescence , analytical chemistry (journal) , materials science , emission spectrum , ion , powder diffraction , spectral line , excitation , crystallography , chemistry , physics , optoelectronics , organic chemistry , chromatography , astronomy , composite material , quantum mechanics
Rare earth ions (Eu 3+ or Tb 3+ )‐activated Ca 3 Ga 2 Si 3 O 12 (CaGaSi) phosphors were synthesized by using a sol–gel method. Photoluminescence spectra of Eu 3+ :CaGaSi phosphors exhibited five emission bands at 578, 592, 612, 652 and 701 nm, which were assigned to the transitions ( 5 D 0 → 7 F 0 , 7 F 1, 7 F 2 , 7 F 3 and 7 F 4 ), respectively, with an excitation wavelength of λ exci = 392 nm. Among these, the transition 5 D 0 → 7 F 2 (612 nm) displayed bright red emission. In the case of Tb 3+ :CaGaSi phosphors, four emission bands were observed at 488 ( 5 D 4 → 7 F 6 ), 543 ( 5 D 4 → 7 F 5 ), 584 ( 5 D 4 → 7 F 4 ) and 614 nm ( 5 D 4 → 7 F 3 ) from the measurement of PL spectra with λ exci = 376 nm. Among these, the transition 5 D 4 → 7 F 5 at 543 nm displayed bright green emission. The structure and morphology of the phosphors were studied from the measurements of X‐ray diffraction (XRD), scanning electron microscopy (SEM) and energy‐dispersive X‐ray analysis (EDAX) results. Copyright © 2011 John Wiley & Sons, Ltd.