Abstract
Eu3+ doped Li2Al2Si3O10 red phosphor was synthesized by the conventional high-temperature solid-state method. The crystal structure, morphology, luminescence properties, thermal stability and quantum efficiency were characterized. The powders show average particle size of 8 μm. The optimum Eu3+ dopant concentration is 0.02 in Li2Al2Si3O10 host lattice. Luminescence quenching is attributed to electric dipole–dipole interaction and impurities. The emission intensity of the 5D0 → 7F2 transition (615 nm) is dominant upon the strongest excitation at 394 nm (7F0 → 5L6 transition). The Li2Al2Si3O10: 0.02Eu3+ phosphor can be excited by near-ultraviolet (n-UV) light and exhibits red emission with the CIE chromaticity coordinates of (0.6389, 0.3488) and color purity as high as 93%. The Li2Al2Si3O10: 0.02Eu3+ phosphor also possesses good thermal stability with quenching energy barrier of 1803 cm−1. The fluorescence lifetime and quantum efficiency are 0.388 ms and 31.5%, respectively. The results suggest that the red phosphor Li2Al2Si3O10:Eu3+ can be used for n-UV excited white LEDs.
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