摘要
采用溶胶-凝胶/燃烧合成法制备不同Sm3+掺量的Y3Al5O12发光体。用XRD,PL等手段研究样品的物相结构和光致发光性能与掺杂浓度之间的关系,并探讨了Sm3+的自身浓度猝灭机制。结果表明:Sm3+掺量对样品晶体结构无明显影响;Y3Al5O12:Sm3+样品的激发主峰位于405nm(6H5/2→4F7/2)附近,而最大发射峰在617nm(4G5/2→6H7/2);Sm3+在Y3Al5O12基质中的最佳掺杂浓度为3.0mol%,其自身浓度猝灭的原因主要是相邻中心的电四极-电四极相互作用引起的交叉弛豫(4G5/2+6H5/2→6F9/2+6F9/2)所造成的。
In this study, a series of Y3Al5O12：Sm^3＋ luminescent materials with different Sm doping were successfully synthesized by the sol-gel combustion method, and characterized by X-ray diffraction （XRD） and photoluminescence （PL） spectrum to investigate the relationships among structure, luminescent properties and Sm^3＋ concentration, and the mechanism of self concentration quenching of Sm^3＋ It is found that the Sm^3＋ concentration has no effect on the crystal structure with the strongest excitation peak of 405 nm, corresponding to the 6H5/2→4F7/2 transition of Sm^3＋. At 405 nm excitation, theY3Al5O12：Sm^3＋ gives a red luminescence centered at about 617 nm （4G5/2→6H7/2）. The suitable doping-concentration of Sm^3＋ in Y3Al5O12 is 3 mol%, and the quenching mechanism is the cross relaxation （4G5/2＋6H5/2→6F9/2＋6F9/2） caused by the interaction of electric quadrupoles between Sm^3＋ ions.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2009年第11期2032-2035,共4页
Rare Metal Materials and Engineering
基金
江苏省自然科学基金项目(BK2007724)
关键词
钇铝石榴石
光谱特性
浓度猝灭
光致发光
溶胶-凝胶/燃烧合成法
yttrium aluminum garnet
spectra properties
concentration quenching
photoluminescence
sol-gel combustion method
