Publication Date:
2012-08-01
Description:
Tb 2.94 Mg x Al 5−2 x Si x O 12: Ce 3+ 0.06 (TMASG: Ce) were synthesized by high temperature Solid-State Reaction (SSR) at different temperatures from 1650°C to 1550°C. Samples with x = 0.1, 0.2, 0.3, 0.6 were fabricated and characterized using powder X-ray diffraction (XRD) and room-temperature photoluminescence spectroscopy. In this work, the excitation and emission spectra indicate that the phosphor can be excited effectively by the blue light (450–550 nm) and exhibit a satisfactory orange–yellow emission from 550 to 575 nm. The reasons of the red-shift of the phosphor have been discussed. A crystal field analysis of the Ce 3+ 5 d energy levels is conducted to explain the correlation between the TMASG: Ce lattice expansion and the Ce 3+ energy level changes. The chromaticity coordinates of the phosphors are tuned from (0.465, 0.527) to (0.512, 0.483). This indicates a prospective for application of this novel phosphor in white light emitting diodes (LEDs).
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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