摘要
采用高温固相法制备了Eu2+掺杂的硫化锶/铝酸锶复合荧光体样品,研究了样品随组成成分变化的相变过程及其光谱特性。结果表明,随着n(SrSO4)/n(SrCO3+SrSO4)值的增加,样品中铝酸锶成分逐步由SrAl2O4相向SrAl4O7相转变。在469nm激发下,当SrSO4达到8%(摩尔分数)时红光发射强度最强。此外,该复合荧光体能在417nm激发下得到红绿双波段荧光,且红、绿荧光相对强度可通过变化基质成分实现调节,在近紫外LED照明上具有潜在的应用价值。更重要的是,该复合荧光体中的SrS成分在铝酸盐的包覆下耐水性得到显著改善,有效增强了其实用性。
The samples of strontium sulphide and strontium aluminate mixed compound were prepared by solid state reaction method. The relation between the phase composition and luminescence properties was investigated. The phase transformation from SRA1204 to SRA1407 was observed by increasing with the ratio of SrSO4 to （SrCO3 At-St- SO4 ）. The intensity of red emission excited at 469nm reaches its maximum when the argO4 concentration is 8% in mole. Additionally, new green and red bands were observed under the excitation of 417nm. Tunable red and green emissions were also witnessed by adjusting the composition of the matrix. The results suggest the phosphor has poten- tial application in near ultraviolet LED. More importantly, the water-resistant stability is greatly improved in the mixed compound, better meeting its practical application.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2012年第18期18-21,共4页
Materials Reports
基金
湖南省教育厅重点项目(10A120)
湖南省自然科学基金项目(10JJ6012)
关键词
铝酸锶
硫化锶
稳定性
strontium aluminate, strontium sulphide, stability
