【作者】 田晶；

【导师】 杨志平；

【作者基本信息】 河北大学 ， 微电子学与固体电子学， 2008， 硕士

【摘要】 本文制备了几种适合近紫外光LED芯片激发的荧光粉。试验了最佳合成条件以及杂质的最佳浓度,测试了样品的激发光谱和发射光谱,研究了样品的发光性质及其形貌。主要内容如下：(1)利用高温固相法合成了红色荧光粉Sr2SiO4:Sm3+。样品具有3组发射峰,主峰值分别位于570nm,606nm和653nm,其中最强峰位于606nm。激发光谱为从350到420nm的宽带,可以被近紫外光和紫光有效激发。当Sm3+浓度为6%,电荷补偿剂为Cl-时,样品的发光强度最大。(2)利用燃烧法制备了红色荧光粉SrIn2O4:Eu3+。样品的最强发射峰位于613nm,对应于Eu3+的5D0→7F2跃迁。随着激活剂Eu3+浓度的增加,样品的发光强度逐渐增大。样品的主激发峰位于397和469nm,分别与紫外光和蓝光LED的辐射相符合。它由许多微小的晶粒组成,晶粒的平均直径小于500nm。(3)利用凝胶燃烧法合成了绿色荧光粉Ca2Si04:Eu2+。样品呈现出峰值位于501nm的宽带发光,它可以被350-400nm的UVLED芯片有效激发,并且制备温度较低(1000℃),颗粒平均尺寸较小(小于1μm)。Eu2+的最佳浓度为3%。(4)利用高温固相法合成了蓝色荧光粉Sr5Si04Cl6:Eu2+。样品的激发峰值位于360nm,适合UVLED芯片的激发。样品在360nm的紫外光激发下呈宽带发射,峰值位于454nm,属于Eu2+的4f(?)5d→4f(?)能级跃迁。样品的最佳制备温度为750℃,Eu2+的最佳浓度为2%。更多还原

【Abstract】 In this paper, several kinds of phosphor used for near-ultraviolet LED were fabricated. The optimal synthesis temperature and the concentration of impurity were tested. The emission and excitation spectra were measured. The luminescence properties and appearances of samples were researched. The chief contents are given as follows:(1) The red phosphor Sr2SiO4:Sm3+ was synthesized by high temperature solid state reaction. The sample has three groups of emission peaks. The main emission peaks are located at 570nm,606nm and 653nm and the strongest one appears at 606nm. Its excitation spectrum extends from 350 to 420nm which indicates that this phosphor can be excited effectively by near-ultraviolet and violet light. When the concentration of Sm3+ is 6% and the charge compensator is Cl-, the strongest emission is obtained.(2) The red phosphor SrIn2O4:Eu3+ was synthesized by combustion. The emission spectrum shows the most intense peak is located at 613nm, which corresponds to the 5D0→7F2 transition of Eu3+. The emission enhances while the concentration of Eu3+ increases. The phosphor has two main excitation peaks located at 397 and 469nm, which match the emission of UV and blue LED respectively. The obtained phosphor consists of many crystalline granules, whose average diameter is less than 500nm.(3) The green phosphor Ca2SiO4:Eu2+ was synthesized by a Sol-gel combustion method. The emission spectrum of Sample shows a broad band with a peak around 501nm. The phosphor can be excited efficiently by UVLED chip whose emission peak locates at 350-400nm. Moreover, the Sample has lower preparation temperature (1000℃) and smaller average grain size(less than 1μm). The best concentration of Eu2+ is 3%.(4) The blue phosphor Sr5SiO4Cl6:Eu2+ was synthesized by high temperature solid state reaction. The excitation peak is located at 360nm, so the phosphor can be excited efficiently by UVLED chip. The phosphor excited by 360nm has a broad emission band with a peak at 454 nm, which corresponds to the 4f65d→4f7 transition of Eu2+. The best reaction temperature is 750℃and the best concentration of Eu2+ is 2%.更多还原