Eu^(2+),Mn^(2+)在CaZn_2(PO_4)_2中的发光及Eu^(2+)→Mn^(2+)能量传递

Luminescence and energy transfer of Eu^(2+),Mn^(2+) in CaZn_2(PO_4)_2

Mn2+作为激活剂加入一些基质中,发光比较弱。因此常常选择使用合适的敏化剂来提高Mn2+的发光效率,本文的研究目就是验证Eu2+是Mn2+的良好的敏化剂。采用高温固相法合成了Eu2+,Mn2+掺杂激活的CaZn2(PO4)2荧光粉,并对其发光性质进行了研究。单掺杂Eu2+时呈现发射峰位于504nm的带谱,属于Eu2+离子的5d-4f能级跃迁辐射,激发峰位于380nm,属于Eu2+的f-d跃迁特征激发谱带。单掺Mn2+时CaZn2(PO4)2不发光。当Eu2+和Mn2+共掺时,出现Mn2+的673nm发射峰,样品发红光,表明Eu2+对Mn2+的发光有很强的敏化作用。研究了Eu2+和Mn2+掺杂浓度对激发光谱和发射光谱的影响,证明在CaZn2(PO4)2:Eu2+,Mn2+中Eu2+对Mn2+的能量传递属于共振能量传递。

When Mn2＋ doped to some interstitial substances,luminescence was very weak.So the appropriate sensitized substance was choosed to increase luminescence efficiency,The researchful purpose validate that Eu2＋ is favorable sensitized substance of Mn2＋.CaZn2（PO4）2：Eu2＋,Mn2＋ phosphor was synthesized by high temperature solid-state reaction,and its luminescence properties were investigated.When the sample doped single Eu2＋,its emission peak locating at 504nm,which correspond to 5d-4f transition of Eu2＋.The excitation peak locating at 380nm,which correspond to f-d broadband absorption of Eu2＋.The sample which doped single Mn2＋ was not luminescent,when it doped together Eu2＋,Mn2＋ ： 673 nm emission peak of Mn2＋ appeared,the phosphor show excellent red emission.It is suggested that Mn2＋ ion is sensitized strongly by Eu2＋ ion,The effect of the molar concentration of Eu2＋ and Mn2＋ on excitation and emission spectra were also studied.It demonstrated that the energy transfer between Eu2＋ and Mn2＋ is due to resonance energy transfer in CaZn2（PO4）2：Eu2＋,Mn2＋.