Rare-earth doped borate phosphor has the advantage of low synthesis temperature

so it is suffered much of recognition in recent decades years. Ba<em>Ln</em>B₉O₁₆ (<em>Ln</em>=La-Lu

Y) is a fine borate host

which can gained different phosphors by doping of different ions (Ce

Dy

Eu

Tb

Mn). For the before time investigation of borate phosphor

solid-state method was used for preparing

the fabrication temperature is about 1 000 ℃

and more the phenomenon of agglomeration is very grave. We synthesized a Eu³⁺ doped boron-containing phosphor having a formula of BaGd_1-<em>x</em>Eu_<em>x</em>B₉O₁₆ by sol-gel method

decreasing the crystallized temperature and avoiding the grave agglomeration.<br>Using Eu₂O₃

Gd₂O₃

boracic acid

barium carbonate acid as starting materials and citric acid as complexing agent

sol-gel method was used to prepare BaGd_1-<em>x</em>Eu_<em>x</em>B₉O₁₆ red phosphor. The influence of preparing condition was discussed

and their structure and luminescence property were characterized by X-ray diffraction (XRD) analysis and fluorescence spectrometry. The investigation showed that the sample can be crystallized under 850 ℃

and gained better crystallized production at 900 ℃. Considering to the luminescence intensity for the samples prepared at different crystallization temperature

BaGd_1-<em>x</em>Eu_<em>x</em>B₉O₁₆ phosphor can get better luminescence intensity and better purity.<p/>The investigation showed that there is huge quenching concentration of Eu³⁺ in BaGd_1-<em>x</em>Eu_<em>x</em>B₉O₁₆. Its about 90%. For the borate synthesis

boracic acid can be volatilization at high temperature

so 15% excessive boracic was necessary. The investigation found that the phosphor can be excitated by 264

394

465

534 nm; they are assigned to Eu—O energy transfer

⁷F₀→⁵L₆

⁷F₀-⁵D₂

⁷F₀-⁵D₁ transitions

respectively. The samples can emit out characteristic red light of Eu³⁺ with the main peak of 614 nm

which is assigned to ⁵D₀-⁷F₂ transition. The energy transfer between Gd³⁺ and Eu³⁺ exist in this phosphor. Different from the phosphors prepared by solid-state method

the highest excitation position is not from energy transfer

it comes from f-f transition which located at 394 nm. Thats suitable to white LED that can give the excitation of purple ray.