Journal
JOURNAL OF RARE EARTHS
Volume 33, Issue 10, Pages 1040-1050Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1002-0721(14)60524-X
Keywords
optical materials; chemical synthesis; X-ray diffraction; luminescence; rare earths
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Funding
- ISM Research Scholars - Government of India
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Novel red emitting Eu3+ doped SrGd2O4 phosphors were synthesized by homogeneous precipitation method followed by a subsequent combustion process at various temperatures. A systematic study on the consequent structural evolution and optical properties were investigated as a function of various processing temperatures. With the enhancement of processing temperature, SrGd2O4 phosphor showed a gradual transformation from a mixed phase to monophasic nature, with minimized volatile impurities. The microscopic images exhibited homogeneous aggregates of varying shapes and sizes with an average length of about 0.5-5 mu m. Eu3+ doped SrGd2O4 phosphors prepared at low temperatures, showed miserably low values of red emission upon UV excitation owing to the presence of volatile impurities. The SrGd2O4:Eu3+ phosphors prepared at relatively high temperature exhibited strong red-orange emissions due to homogeneously occupied Eu3+ ions in the host lattice. The dominant red to orange (R/O) emission intensity ratios and CIE parameters of Eu3+ ions substantiated the site occupation of higher asymmetry sites of Gd3+ ions and the strong covalent nature. Dexter theory and critical distance calculation suggested that the dipole-dipole interaction could be responsible for the concentration quenching of Eu3+ (4 mol.%) doped SrGd2O4 phosphors. Elevated physical and chemical durability and stable photoluminescence made these phosphors suitable for white LEDs and other display applications.
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