Abstract
A novel silicate oxyapatite red phosphor Ba2La4Y4(SiO4)6O2:Eu3+ was synthesized by solid state reaction method. The results show that Eu3+ ions replace La3+ ions can lead to higher luminescence intensity than replacing Y3+ ions. Moreover, Ba2La4Y4(SiO4)6O2:Eu3+ shows a high quantum yield of 67.46% and high thermal stability (the luminescence intensity remains 94.1% of its initial PL intensity at 125 °C, and maintains 77.6% at 150 °C) by regulating the relative content of Y3+ ions and La3+ ions. Finally, a warm white LED with low CCT of 3306 K, high luminous efficiency of 33.55 lm/W and Ra of 91 was achieved by combining Ba2Y4La4(SiO4)6O2:Eu3+ red phosphor with BaMgAl10O17:Eu2+ blue phosphor and (Sr, Ba)2SiO4:Eu2+ green phosphor under 395 nm NUV chips. All the results manifest that the red phosphor Ba2Y4La4(SiO4)6O2:Eu3+ can be used as a potential NUV-excited red phosphor for high-performance high-power warm white LEDs.
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