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Erschienen in:
24.05.2017
Spectroscopic properties of a novel garnet-type tellurate orange-red emitting Li3Gd3Te2O12:Sm3+ phosphor
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 17/2017
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Abstract
A series of novel garnet-type tellurate orange-red emitting phosphors Li3Gd3(1−x)Te2O12:xSm3+(x = 0.003–0.10) were successfully synthesized by a high-temperature solid-state reaction method. The compounds were crystallized in the cubic structure with the space group of Ia
\(\bar 3\)
d. The excitation spectrum indicates that the Li3Gd3Te2O12:Sm3+ phosphor can be excited efficiently under 406 nm irradiation, which matches well with the output wavelength of UV LED chips. The photoluminescence spectrum of Li3Gd3Te2O12:Sm3+ phosphor shows four peaks assigned to the 4G5/2–6HJ (J = 5/2, 7/2, 9/2, and 11/2) transitions of Sm3+. The luminescence intensity keeps increasing with increasing the content of Sm3+ to 2 mol%. The quenching temperature for Li3Gd3Te2O12:0.02Sm3+ was estimated to be above 480 K. Therefore, Sm3+-doped Li3Gd3Te2O12 phosphors are potential orange-red emitting phosphors for near-UV chip-based white light-emitting diode and display devices.