Y3Al5O12基质中Sm3+离子浓度对其发光特性的影响

Influence of Concentration of Sm3+ Ions on the Luminescent Characteristics

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405 nm (6H5/2→4F7/2)附近，而最大发射峰在617 nm (4G5/2→6H7/2)；Sm3+在Y3Al5O12基质中的最佳掺杂浓度为3.0 mol%，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

Abstract:

In this study, a series of Y3Al5O12:Sm3+ 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 Sm3+ concentration, and the mechanism of self concentration quenching of Sm3+. It is found that the Sm3+ 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 Sm3+. At 405 nm excitation, the Y3Al5O12:Sm3+ gives a red luminescence centered at about 617 nm (4G5/2→6H7/2). The suitable doping-concentration of Sm3+ 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 Sm3+ ions