Abstract
A series of LiLaMo2O8:Eu3+, R (R = Bi3+ and Sm3+) phosphors are synthesized by a high temperature solid-state reaction method in air. The crystal structures, fluorescence lifetimes, and luminescence properties are investigated in detail. LiLaMo2O8:Eu3+ phosphor with excitation 395 nm shows red light in the range of 525–725 nm and it photoluminescence intensity may be enhanced ∼2.35 times due to energy transfer (ET) from a sensitizing species (Bi3+ or Sm3+) to Eu3+ ion after Bi3+ or Sm3+ ion is co-doped. The optimal Eu3+, Bi3+, and Sm3+ ion concentrations are 4%. Luminous mechanism of LiLaMo2O8:Eu3+, R (R = Bi3+ and Sm3+) phosphors and ET processes between Eu3+ and Bi3+/Sm3+ ions are analyzed and explained by their excitation and emission spectra and energy level diagrams of Eu3+, Bi3+, and Sm3+ ions. The experimental results indicate that LiLaMo2O8:Eu3+, R (R = Bi3+ and Sm3+) phosphors may be used as potenial red emitting materials for white light emitting diodes (LEDs) based on either a near ultraviolet (∼395 nm) or blue (∼465 nm) chip.
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