黄色荧光粉Sr_3SiO_5:Eu^(2+)相转变机理  

Phase transformation mechanisms in the synthetic process of Sr_3SiO_5:Eu^(2+) yellow phosphors

作　　者：王婷[1] 周航[1] 张新[1] 徐旭辉[1] 邱建备[1] 余雪[1] 

机构地区：[1]昆明理工大学材料科学与工程学院新材料重点实验室,昆明650093

出　　处：《中国科技论文》2014年第2期207-211,共5页China Sciencepaper

基　　金：高等学校博士学科点专项科研基金资助项目(20115314120001)

摘　　要：高温固相法合成Sr3SiO5:Eu2+过程中,杂质相Sr2SiO4:Eu2+的存在会不同程度影响Sr3SiO5:Eu2+的光致发光性能及余辉性能。本文通过压片烧结和燃烧法两种方法制备Sr3SiO5:Eu2+,结合热重-差热分析和X射线衍射分析,研究了Sr3SiO5:Eu2+在合成过程中的相变化规律以及动力学过程。研究表明:原料与坩埚的接触处形成的界面以及原料在升温过程经过Sr2SiO4:Eu2+的合成温度区间是导致杂质相产生的主要原因。在升温过程中,当温度经过1 200℃左右的温度区间时,由于原料与坩埚接触处可以看作是两组不同物质的分界面,Sr2SiO4:Eu2+的合成首先在该分界面处合成,而更多的原料需要扩散通过生成物层才能进一步反应;但随着温度的升高,原料随后进入Sr3SiO5:Eu2+的合成过程,从而导致了Sr2SiO4:Eu2+杂质相的生成。Sr3 SiO5：Eu2＋yellow phosphors were synthesized through the high temperature solid state reaction method under a re-ductive atmosphere.Impurity phase Sr2 SiO4：Eu2＋acts as the phase and significantly affects the photoluminescence and afterglow properties of Sr3 SiO5：Eu2＋ yellow phosphors.In the synthetic process,the phase transformation process and kinetic process were investigated by DTA／TG,tabletting,combustion and XRD patterns.It is indicated that the thermal field between raw ma-terials and the crucible is responsible for the impurity phase.In the synthesis process,at around 1 200℃,the area where the raw materials are in contact with the crucible can be regarded as the interface of two different components,and thus,the synthesis of Sr2 SiO4：Eu2＋firstly occurred in the interface and generated product layer Sr2 SiO4：Eu2＋.Further reaction occurs when more raw materials diffuse through the interface.Finally,Sr3 SiO5：Eu2＋ yellow phosphors will be synthesized at higher temperatures,and the impurity phase was therefore formed.

关 键 词：发光二极管 硅酸盐 锶化合物 铕 固相反应 相变 杂质相 

分 类 号：TQ422[化学工程]