Abstract

Y $_{2.95}$ Al $_{5}$ O $_{12}{:}{{0.05Ce}}$ $^{3+}$ phosphors were synthesized via the solid-state reaction method using fluxes of H $_{3}$ BO $_{3}$ and BaF $_{2}$ . The thermal stability and luminescence of Y $_{2.95}$ Al $_{5}$ O $_{12}{:}{{0.05Ce}}$ $^{3+}$ prepared with 6 wt% BaF $_{2}$ flux additive (Sample II) were compared with those of Y $_{2.95}$ Al $_{5}$ O $_{12}{:}{{0.05Ce}}$ $^{3+}$ prepared with 7 wt% H $_{3}$ BO $_{3}$ flux additive (Sample I). The crystallinity of Sample I was found to be better than that of Sample II. This difference in crystallinity, which led to a difference in thermal stability, is well explained by the presence of defects. Moreover, Sample I, Sample II, and commercial Y $_{3}$ Al $_{5}$ O $_{12}{:}{{Ce}}$ $^{3+}$ phosphors were coated onto 450-nm chips for the fabrication of white light-emitting diodes (WLEDs). The luminous efficacy (@ 350 mA) of Sample-I-based (68.98 lm/W) and commercial-Y $_{3}$ Al $_{5}$ O $_{12}{:}{{Ce}}$ $^{3+}$ -based (70.87 lm/W) WLEDs was lower than that (77.2 lm/W) of the Sample-II-based WLED due to the powder morphology of the phosphors.

© 2015 IEEE

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