摘要
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.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2011年第5期554-559,共6页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金项目(20871121)
2010年韩山师范学院博士启动基金项目
韩山师范学院理科青年科学基金项目(LQ201001)资助