UV-LED用2(Sr,Ba)O-0.16B_2O_3-0.84P_2O_5:Eu^(2+)荧光粉

Phosphor of 2(Sr,Ba)O-0.16B_2O_3-0.84P_2O_5:Eu^(2+) for UV-LED

以SrCO3、BaCO3、H3BO3、Eu2O3和NH4H2PO4为原料,通过高温固相法,合成了2(Sr,Ba)O-0.16B2O3-0.84P2O5:Eu2+荧光粉。通过XRD图谱、激发和发射光谱、光色参数和相对亮度的测量,研究了Ba2+对荧光粉的晶体结构以及发光性能的影响。结果表明:2(Sr,Ba)O-0.16B2O3-0.84P2O5:Eu2+荧光粉属于四方晶系,晶胞参数随Ba2+摩尔含量增加而增大。Ba2+的引入可以显著提高荧光粉的相对亮度,同时,随着Ba2+摩尔含量的增加,荧光粉的发射主峰向短波方向移动,出现蓝移,其色坐标y值逐渐减小,有利于提高白光发光二极管的流明效率和显色指数。

With SrCOa, BaCO3, H3BO3, Eu2O3 and NH4H2PO4 as raw materials, the phosphors of 2（Sr,Ba）O-0.16B2O3-0.84P2O5 ：Eu^2＋ were synthesized by conventional solid-state method. With the measurements of XRD, excitation and emission spectra, color parameters and relative brightness, the effect of Ba^2＋ on crystal structure and photoluminescent properties of phosphors were investigated. The results show that crystal structure of 2（Sr,Ba）O-0. 16B2O3-0.84P2O5 are attributed to tetragonal system. Cell volume and cell parameters increase with the increasing of Ba^2＋ content. Meanwhile, relative brightness increase remarkably by introducing Ba^2＋. The blue-shift appears in emission spectra while the content of Ba^2＋ are increased. Blue-shift results in the descent in y coordinate in CIE system. Lumen efficiency of white-LEDs was benefited from adulterating Ba^2＋,which enable white-LEDrs application in common illumination.