SrB_4O_7∶Eu磷光粉的制备及其发光性能  

Synthesis and Luminescent Properties of SrB_4O_7∶Eu Phosphors

作　　者：张林进[1] 叶旭初[1] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《发光学报》2009年第2期184-188,共5页Chinese Journal of Luminescence

摘　　要：采用高温固相法合成了SrB4O7∶Eu荧光粉,并研究了不同原料、掺杂浓度、煅烧温度等因素对其发光性能的影响。发射光谱测试结果表明:SrB4O7∶Eu荧光粉的最佳Eu掺杂浓度为2%左右,进一步增大掺杂浓度会导致浓度猝灭。煅烧温度对基质组成影响较大,随着温度的升高,基质中BO4四面体所占比例增大,有利于Eu3+离子的还原。以水合硼酸锶为原料制得样品的发光强度高于以SrCO3和H3BO3为原料制得样品的发光强度。In recent years, the borate-based phosphors have attracted great interest due its easy synthesis, low preparative temperature and high fluorescent yields. Many borates which contain BO4 group have attracted more and more attention, because the tetrahedral structure of BO4 can restrain the oxidation of divalent rare- earth ions. The typical representations of better borate matrix are SrB6O10, Sr2B5O9X（X = C1, Br） and SrB4O7. Strontium borate phosphors are usually synthesized by traditional solid state reactions by using SrCO3 and H3BO3 as raw materials. However, less attention has been paid to the influence of synthesis route on the final performance of the products. In this work, SrB4O7： Eu phosphors were prepared using hydrated strontium borates（SrB2O4· 4H2O and SrB6O10 · 5H2O） as raw materials. The effect of doping concentration and post- calcining temperature on the luminescence properties was studied. It was found that Eu ions with two oxidation states （ ＋ 2 and ＋ 3） coexist in the SrB4O7 host. The emission spectrum shows that the main emission peak located at 367 nm, which is attributed to Eu^2＋ ions transition from 4f^65d to 4f^7 （^8S7/2 ）. The emission peaks of Eu^3＋ ions located at 588, 600,614, 651 and 700 nm corresponding to the transitions ^5D0→^7F0, ^5D0→^7Fl, ^5D0→^7F2,^5D0→^7F3,^5D0→^7F4 respectively. Among them, the dominant emission is the electric-dipole tran- sition ^5D0→^7F2, indicating that the Eu^3＋ ion occupies asymmetrical center in lattice. The emitting intensity mainly depends on the amount of luminescence center which is relate to the doping concentration. The emitting intensity increases to a maximum with the increment of doping concentration, and then it decreases because of concentration quenching. When the Eu concentration is about 2% , the maximum of emitting intensity occurs. Post-calcining temperature influences on the chemical structure form of resultant powder. SrB2O4, SrB6O7 and SrB4O7 are formed when the post-calcining temperature is

关 键 词：硼酸锶 高温固相法 水合硼酸锶 发光特性 

分 类 号：O482.31[理学—固体物理]