LiY1-xEux（MoO4）2 as a promising red-emitting phosphor of WLEDs synthesized by sol-gel process

A series of LiY1-xEux(MoO4)2 red-emitting phosphors were synthesized by sol-gel technique. The phase impurity and spectroscopic properties were characterized by X-ray diffraction (XRD) and photo-luminescence (PL) spectra respectively. The effect of Eu3+ doping con-centration, annealing temperature and the molar ratio of citric acid to the total metal cations (C:M) on the optical properties of the red phos-phors were studied and optimized. It was found that all the samples could be excited efficiently by blue light (465 nm), which was well coin-cident with the emission of GaN based LED chips. The luminescent intensity reached maximum when annealing temperature was 750 ?C and Eu3+ doping concentration was 5% with C:M=3:1.     

真有效值的测量及应用

平均响应测量有效值的方法会因被测波形不同而存在很大误差,甚至得出错误的结果.对真有效值测量的原理和应用意义做了一个探讨.     

浅谈信息机房的日常管理和维护

信息机房是一个企业在信息技术方面的名片,日新月异的信息技术决定了一个企业数字化的管理能否走在时代前沿,但是如果日常运维不规范,将严重影响信息机房运维效率。鉴于此,根据信息机房运维管理经验以及日常维护中发现的不足,对信息机房在日常管理维护中存在的问题展开深入探讨,希望能对信息机房高效、稳定运行有所助益,为企业信息化工作的推进添砖加瓦。