【作者】 魏秀丽；

【导师】 张显友；

【作者基本信息】 哈尔滨理工大学 ， 材料学， 2011， 硕士

【摘要】 硼铝酸盐基质的发光材料结合了硼酸盐和铝酸盐体系两种发光材料的优点,并且在结构中含有大量的硼氧和铝氧基团,使其在真空紫外区具有很强吸收,因此有希望成为新一代的PDP用荧光粉。高温固相法是合成YAB:Tb³⁺荧光粉的传统方法,但是这种方法所需的温度较高,且反应的时间较长,并且对样品的球磨处理在一定程度上会影响发光效率,因此改进制备工艺或寻求新的制备方法对提高荧光粉的发光性能具有一定的意义。本文通过化学共沉淀法,合成了以YAl₃（BO₃）₄为基质,Ce³⁺为敏化剂, Tb³⁺为激活剂的绿色荧光粉,并对所制备的粉体的结构、形貌、结晶度及荧光性能进行了分析。为了得到发光效率较高的YAB:Ce³⁺, Tb³⁺荧光粉,本文首先探索了Tb³⁺的浓度对发光强度的影响,研究了Ce³⁺离子的掺杂对Tb³⁺离子的特征发射峰强度的影响,分析了能量传递的机理,其次以离子溶液浓度、沉淀剂浓度、硼酸含量和沉淀温度为影响参数,对YAB:Ce³⁺, Tb³⁺荧光粉的制备条件进行了研究,最后通过热处理研究了煅烧条件对荧光粉发光强度的影响。通过实验表明:在YAl₃（BO₃）₄基质中,稀土离子Ce³⁺和Tb³⁺的掺杂浓度为30%和10%时,发光强度最强,Ce→Tb之间存在着有效的能量传递;在溶液浓度为0.4mol/L,沉淀剂浓度为4mol/L、B含量为125%及水浴温度为25℃的合成条件下,荧光粉发光强度最强;在1100℃煅烧高温下,烧结2h得到的荧光粉发光强度最好。更多还原

【Abstract】 Boron aluminate light-emitting materials combine both borate and aluminate luminescent material advantages, and in the structure contains large amounts of boron oxide and aluminum oxygen groups, so that they have strong absorption in the VUV region, therefore they are expected to become the new generation of PDP phosphors. High temperature solid state method is a traditional method to prepare YAB: Tb³⁺ phosphor, but this method requires a higher temperature and longer reaction time, and the ball milling process on the sample may influence the luminous efficiency in some extent, thereby improving preparation process or to seek new ways to improve the preparation of luminescent properties of phosphors have some significance. In this paper, the green phosphor was prepared by means of chemical co-precipitation method, which were based on YAl₃（BO₃）₄, sensitized by Ce³⁺, activated by Tb³⁺, and the structure of the prepared powders, morphology, crystallization and fluorescence performance were analyzed.In order to obtain a higher luminous efficiency YAB: Ce³⁺, Tb³⁺ phosphor, the luminescence intensity impacted by the concentration of Tb³⁺ was explored in this paper, and the Tb³⁺ ions characteristic emission peak of strength impacte by the Ce³⁺ ion doped was also studied, and the energy transfer Mechanism was analysised, followed YAB: Ce³⁺, Tb³⁺ phosphor preparation conditions were studied by ion concentration, precipitant concentration, boric acid content and temperature as precipitation parameters, and finally the calcination conditions impact on the luminescence intensity of phosphor through the heat treatment were studied.The experimental results indicate that: in YAl₃（BO₃）₄, rare earth ions Ce³⁺ and Tb³⁺ doping concentration is 30% and 10%, the luminous intensity strongest, Ce→Tb exists the effective energy transfer; under synthesis conditions of solution concentration is 0.4 mol/L, precipitation agent concentration is 4mol/L, B content is 125% and temperature water-bath is 25℃, phosphor luminous intensity strongest; under the 1,100℃and high temperature sintering for 2h, the fluorescence intensity of samples is best.更多还原