Preparation of a new long afterglow blue-emitting Sr2MgSi2O7-based photoluminescent phosphor
Preparation of a new long afterglow blue-emitting Sr2MgSi2O7-based photoluminescent phosphor
复制标题
DOI：
10.1023/a:1017930630889
复制
发表时间：
2001-01-01
期刊：
影响因子：
--
通讯作者：
Zhang, JY
中科院分区：
文献类型：
--
作者：
Lin, YH;Tang, ZL;Zhang, JY
在过去的十年中，以铝酸盐为基质的稀土离子掺杂的荧光粉（如SrAl_2 O_4：Eu，Dy）由于其具有高亮度、无辐射、长寿命、良好的光阻性和环保性等优点而引起了人们的广泛关注。然而，这些荧光粉在水中浸泡数小时后，其性能可能会大大下降，这限制了它们在颜料，涂料和其他领域的应用[1，2]。SHM Poort等人制备了Sr 2 MgSi 2 O 7：Eu和Ca 2 MgSi 2 O 7：Eu。Eu荧光粉在还原气氛（25%H2 - 75%N2）中于800 ℃焙烧1 h和在1200 ℃焙烧3次7 h，发现室温下的主发射峰分别位于470 nm和535 nm [3]，但在这些荧光粉中没有观察到长余辉。本论文以SrCO_3、4MgCO_3· Mg（OH）_2·5H_2O、SiO_2、Eu_2O_3、Dy_2O_3为原料（均为试剂级），采用XRD、SEM、SEM、XRD、SEM等方法对样品进行了表征。加入少量的H3 BO 3（每种硅酸盐约10 m/o）作为助熔剂。通过球磨机将原料混合6小时，制备了新型长余辉蓝色发光Sr 2 MgSi 2 O 7：采用传统的陶瓷合成方法，在1300 ℃，5%H2 - 95%N2弱还原气氛下，合成了Eu，Dy（SMS-ED）荧光粉，并对其物相组成和光学性能进行了详细研究。按照上述合成条件制备在SMS基质中共掺杂不同量Dy的不同磷光体。图1所示的SMS-ED的典型XRD图案表明，掺杂的Eu和共掺杂的Dy离子对发光材料的结构几乎没有影响，并且所有的峰都归属于Sr 2 MgSi 2 O 7相。
In the last ten years aluminates-based doped rare earth ions phosphors (eg SrAl2O4: Eu, Dy) attracted more interest due to their excellent properties such as high brightness, no radiation, long duration, excellent photoresistance, and environmental capability. However, the properties of these phosphors may be decreased greatly while soaked in the water after several hours, which limited their application in the pigments, paints and other fields [1, 2]. SHM Poort et al. prepared Sr2MgSi2O7: Eu and Ca2MgSi2O7: Eu phosphors by firing at 800◦ C in a reducing atmosphere (25% H2-75% N2) for 1 h and three times at 1200◦ C for 7 h, and found that the main emission peaks at room temperature located at 470 nm and 535 nm respectively [3], but the long afterglow was not observed in these phosphors. In this work, SrCO3, 4MgCO3· Mg (OH) 2· 5H2O, SiO2, Eu2O3, Dy2O3 were employed as the raw materials (these materials are all reagent grade). Small quantities of H3BO3 (about 10 m/o per of one silicate) were added as a flux. The raw materials were mixed by the ball mill for 6 h, a new long afterglow blue-emitting Sr2MgSi2O7: Eu, Dy (SMS-ED) photoluminescent phosphor was prepared by the traditional ceramic synthesis method at 1300◦ C for 3 h and weak reductive atmosphere of flowing 5% H2-95% N2 gas, and its phase composition and optical properties were studied detailedly.As shown in Table I, different phosphors co-doped various amounts of Dy in the SMS matrices were prepared as the above-mentioned synthesis conditions. The typical XRD patterns of SMS-ED shown in Fig. 1 indicated that the doped Eu and co-doped Dy ions had little influence on the structure of luminescent materials, and all of the peaks are assigned to the phase of Sr2MgSi2O7.