Gathering clouds hid the dying sun , but its rays still dyed the glowing sky 渐渐密集的乌云将快要消失的太阳藏了起来，但是，太阳的余辉依然染红了天空。
The long afterglow luminescent material of sr2mgsi2o7 was prepared by sintering at high temperature under the deoxidization atmosphere 首先，采用高温固相法，在还原气氛下制备出sr _ 2mgsi _ 2o _ 7基长余辉发光材料。
The adulteration of bi3 sm3 + can increase the fluorescent intensity , while dy3 + > gd3 la3 + reduce it ^ specially dy3 " 1 " 掺杂微量bi和sm使余辉强度的提高，但dy 、 la和gd则使磷光体余辉强度有所降低，其中dy较为明显。
As one of the most important state luminescent materials , the long afterglow phosphors had been researched as early as 70s of 19 century 作为固体发光材料中很重要的一类，长余辉发光材料的研究早在19世纪70年代就已经开始。
Research on yttrium oxysulfide phosphor doped with eu3 + is to made to develop a new high - efficient , steady and red phosphor without radioactive substance 以期发展一类不含放射性物质的安全、高效，稳定的新型红色长余辉磷光体。
In 1990s , the new long afterglow phosphors were synthesized , and were attended especially because of their better luminescence properties 20世纪90年代制备出的新一代长余辉发光材料因具备更佳的发光性能而倍受关注，一直是研究的热点。
The luminous intensity of phosphor - powder synthesized by this method is 32mcd / m2 after the sample was excitated 300s , and the decay time of the sample is 350min 该法制备出的发光粉激发后300s时的余辉强度32mcd m ~ 2 ，测量余辉时间为350min 。
Eu2 + ion activated strontium aluminate phosphors are a kind of photoluminescent materials with high brilliance , long afterglow and stable performance 稀土铕离子掺杂的铝酸锶基质发光材料是一类发光亮度高、余辉时间长、性能稳定的长余辉发光材料。
But at the present moment the whole road looked rather pretty , for the sun had just set in splendor , and the equalities of rent were drowned in a saffron afterglow 但此时整条路看起来都挺美，金灿灿的太阳刚落下山，橙红色的余辉掩盖了房屋的种种差异。
The influence rule of y2c > 2s : eu , mg , ti long - persistent phosphor fluorescent properity and luminesce intensity is studied with the changing of concentration of mg , ti 研究了不同的mg ， ti掺杂量对y2o2s - eu ， mg ， ti磷光体发光强度和余辉特性的影响规律。
