Recently, considerable efforts have been devoted to research on new materials to be used for Solid-State Lighting (SSL). In the past few years, several new rare-earth (Ln) and alkaline earth borates such as LnCa₄O(BO₃)₃, Ln₂CaO(BO₃)₂ and LnBaB₉O₁₆ have been synthesized. Among these compounds, the structure and luminescence properties of LnBaB₉O₁₆ have attracted considerable interest as universal hosts of the luminescent materials for tri-color lamps. Rare earth doped borates with high B₂O₃ contents are especially attractive, because of their excellent chemical and thermal stability, which is due to the small alkaline earth content and the rigid covalent boron-oxygen network. Motivated by the need for new efficient red phosphors for solid-state lighting applications, we have attempted to synthesis a borate base red phosphor which can emit efficiently under the UV and blue light excitation. Eu-doped red-emitting BaGdB₉O₁₆ phosphors were synthesized via a sol-gel process and the conventional solid state method. They were characterized by XRD, PL and SEM, respectively. No concentration quenching of Eu³⁺ was observed in this research work. The excitation and emission spectra indicate that these phosphors can be effectively excited by UV (395nm) and blue (466nm) light, and exhibit a satisfactory red performance (613nm), nicely fitting in with the widely applied UV or blue LED chips. The luminescent intensity of sol-gel derived is comparable with the solid state product. In comparison with the commercial red phosphor, CaS:Eu²⁺, our synthesized BaEuB₉O₁₆ shows higher PL intensity when excited with 466 nm light. The intense red emission of BaEuB₉O₁₆ under 395 nm and 466 nm excitation suggests that this phosphor is promising candidate as red-emitting phosphor for near-UV/ blue-GaN based light-emitting diodes for white light generation.

1. POSTER: Red-emitting Ba(Eu,Gd)B_{9}O_{16} phosphors for LED, Microsoft Office Document, 0MB

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