Ce3＋离子激活的Sr5(BO3)3F荧光材料VUV-Vis发光性质

Luminescence of Ce^(3+) Activated Sr_5(BO_3)_3F Under Vacuum Ultraviolet-Vis Excitation

利用高温固相法合成了一系列Ce3+掺杂的Sr5-2xCexNax(BO3)3F(x=0.01,0.03,0.05,0.10,0.15,0.20,0.25,0.30,0.35)荧光粉。用XRD表征了荧光粉的相纯度。测定了材料在真空紫外-紫外(VUV-UV)范围的激发光谱和VUV-UV光激发下的发射光谱。研究结果显示:Sr5(BO3)3F的基质吸收峰位置大约在150～190 nm范围,与Xe基稀有气体混合物等离子体发射波长吻合,适于用作PDP和无汞荧光灯用荧光粉的基质材料。从VUV-UV激发和发射光谱来分析,Ce3+在Sr5(BO3)3F中是占据了Sr(1)和Sr(2)格位,当Ce3+的掺杂浓度较低时,进入Sr(2)格位Ce3+的发光(～390 nm)较强,随着Ce3+的掺杂浓度增加,较低能量Sr(1)格位上Ce3+的发射(～450 nm)增强,因而在同一波长激发下,发射光谱随着掺杂浓度增加发生明显的红移现象,荧光体的发光颜色由蓝紫光(390 nm)向蓝绿光(453 nm)变化。

A series of powder samples Sr5-2x CexNax （BO3）3F （x = 0.01, 0. 03, 0.05, 0. 10, 0. 15, 0. 20, 0.25, 0.30, 0.35） was synthesized by a solistate reaction at high temperature. The phase purity was characterized by the powder X-ray diffraction （XRD）. The luminescence properties were investigated by Vacuum-Ultraviolet （VUV） and Ultraviolet （UV） spectra. The results demonstrated that the band near 150 -190 nm range in the VUV excitation spectra was ascribed to the host-related absorption. Ce3＋ occupied Sr （ 1 ） and Sr （ 2 ） sites in Sr5 （ SO3 ）3F. With the increase of Ce3＋ concentration, the luminescence intensity ratio of Ce3＋ in Sr （ 1 ）/ Sr （ 2 ） increased. Meanwhile, the peaks of emission spectra shifted to long-wavelength under the same excitation wavelength with the light-color change from blue-purple to blue-green.