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Combustion Synthesis of Hexaaluminate Phosphors
Author(s) -
Ravichandran Duraiswamy,
Roy Rustum,
Ravindranathan Palaniappan,
White William B.
Publication year - 1999
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1999.tb01881.x
Subject(s) - phosphor , combustion , scanning electron microscope , materials science , analytical chemistry (journal) , particle size , quenching (fluorescence) , emission intensity , emission spectrum , luminescence , chemistry , chemical engineering , fluorescence , spectral line , optics , optoelectronics , composite material , physics , astronomy , engineering , chromatography
Green phosphors of the composition Ce 1‐ x Tb x MgAl 11 O 19 (0.1 < x < 0.6) were prepared via self‐propagating (combustion) synthesis, using urea as a fuel. The phosphors that were produced via the combustion route were fine powders and produced a luminous intensity of 72%, compared to an optimized commercial phosphor. The excitation spectra were characteristic of the Ce 3+ cation; however, no Ce 3+ emission was observed. Energy transfer from the Ce 3+ cation to the Tb 3+ cation was complete, and only the 542 nm Tb 3+ emission was observed. Concentration quenching occurred with x > 0.5. Scanning electron microscopy images showed a well‐crystallized, platelike morphology, with a particle size of 10‐20 µm.