【作者】 闻建伟；

【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， 2010， 硕士

【摘要】 本文以Ca4Y6Si6O25基质为研究对象,分别掺杂Eu3+、Eu2+、Ce3+和Dy3+四种稀土离子作为激活剂,研究了它们在Ca4Y6Si6O25基质中的发光性质,并进行了初步的理论分析。利用高温固相法制备了Ca4Y6Si6O25:Eu3+红色荧光粉。Ca4Y6Si6O25:Eu3+的发射以614nm处的5D0 7F2的发射为主。它既可作为“近紫外光芯片+三基色荧光粉”的红粉也可为“蓝光芯片+黄色荧光粉”弥补红色成分。Ca4Y6Si6O25:Eu2+绿色荧光粉的激发谱是350-450 nm的宽带谱,可被近紫外光-蓝光芯片很好的激发,Eu2+占据了两种晶体格位,其发射光谱为不对称的宽带谱,峰值波长为527 nm。当Eu2+的浓度为20%时为最佳发光强度,根据Dexter理论得出,浓度猝灭为电四极-电四极相互作用的结果。Ca4Y6Si6O25:Ce3+存在三个激发峰,可以被电子束和近紫外光有效地激发。在不同波长的激发下,发射波长也不同。随着Ce3+的含量增加,未发生浓度猝灭,并出现了红移现象。其色坐标(x,y)在(0.1614,0.1325)到(0.1618,0.1332)范围变化。Ca4Y6Si6O25:Dy3+可作为单一基质白色荧光粉材料。材料的发射光谱峰值分别位于480 nm和573 nm处。监测480 nm和573 nm发射峰,所得的激发光谱的激发峰基本一致,都是由多个谱峰组成,最高激发峰为348 nm。当xDy=24%时,Ca4Y6Si6O25:Dy3+样品的色坐标(x,y)为(0.3011,0.3182),接近于纯白色。Dy3+在573 nm发射谱的浓度猝灭机理为电偶极-电偶极的相互作用。更多还原

【Abstract】 This paper is focused on a single phosphor Ca4Y6Si6O25, doping Eu3+, Eu2+, Ce3+and Dy3+four kinds of rare-earth ions as activators, we studied their luminescence properties in matrix and have a preliminary theoretical analysis.:Eu3+red phosphor was prepared using solid state reaction method. And the emission was mainly with 5D0 7F2 of 614nm of Eu3+. It can be used as red phosphor in "near-UV chip+tri-phosphor" and can also make up the red component in "blue chip+ yellow phosphor". The excitation spectrum of Ca4Y6Si6O25:Eu2+ green phosphor is a 350-450 nm broadband spectrum and can be well excited by near-UV to blue chip. Eu2+ takes the place of Ca2+ and occupies two kinds of lattice positions. The emission spectrum is a unsymmetrical broadband spectrum and the peak located at 527 nm. When the Eu2+ concentration is 20% intensity get to the top. According to Dexter theory, the concentration quenching is the electric quadrupole-electric quadrupole interaction. The Ce3+-doped Ca4Y6Si6O25 phosphor possesses three excitation peaks which match electron beam and UV excitation. At different excitation wavelengths, the emission spectra are also different. With the Ce3+content increased, the concentration quenching does not occur and the red shift phenomenon occurs. The color coordinates (x, y) changes from (0.1614,0.1325) to (0.1618,0.1332).Single matrix Ca4Y6Si6O25:Dy3+ material white phosphor was fabricated. This material emission spectrum peaks are located at 480 nm and 573 nm. Monitoring 480 nm and 573 nm, the excitation spectra peaks obtained basically the same as each other. The maximum excitation peak is 348 nm. When XDy=24%, Ca4Y6Si6O25:Dy3+ sample color coordinates (x, y) is (0.3011,0.3182) which is close to pure white. the concentration of quenching mechanism of Dy3+ at 573 nm electric dipole-electric dipole interaction.更多还原