Abstract
A series of LiLu(MoO 4 ) 2 :Sm 3+ red phosphors with high thermal stability were synthesized by sol-gel method. The crystal structure, morphology, concentration-dependent luminescence spectra and temperature-dependent luminescence spectra/decay times of the phosphors were systematically investigated. The LiLu(MoO 4 ) 2 :Sm 3+ phosphors have a scheelite structure with tetragonal system. Under the UV excitation of 405 nm, the LiLu(MoO 4 ) 2 :Sm 3+ phosphors emit red light centered at 648 nm corresponding to the 4 G 5/2 → 6 H 9/2 transition of the Sm 3+ ion. LiLu(MoO 4 ) 2 :Sm 3+ red phosphors exhibited high color purity (98.84%) and a CIE coordinate (0.5806, 0.4145). The LiLu(MoO 4 ) 2 :Sm 3+ phosphors also demonstrate an excellent luminescence thermal stability (the luminescence intensity at 473 K remains 93% of that at 298 K keeps 93% at 473 K). These experimental results demonstrate the potential application of LiLu(MoO 4 ) 2 :Sm 3+ phosphor in the red component of white light-emitting diodes. • LiLu(MoO 4 ) 2 :Sm 3+ red phosphor was successfully synthesized via the sol-gel method. • LiLu(MoO 4 ) 2 :Sm 3+ red phosphors exhibited high color purity (98.84%). • A zero-thermal quenching of LiLu(MoO 4 ) 2 :Sm 3+ phosphor are obtained. • The local rigid structure around Sm 3+ inhibits nonradiative transition of Sm 3+ with increasing temperature.
Published Version
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