Mn^(2+)和Cr^(3+)在镁铝尖晶石中的发光性质及其能量传递  

Luminescence of Mn^(2+) and Cr^(3+) and Their Energy Transfer in MgAl_2O_4

作　　者：饶汗[1,2] 夏长泰[2] 初本莉[1] 丁鹏[1] 赛青林[2] 

机构地区：[1]华南师范大学物理与电信工程学院,广东广州510006 [2]中国科学院上海光学精密机械研究所强激光材料重点实验室,上海201800

出　　处：《光学学报》2010年第7期1921-1925,共5页Acta Optica Sinica

基　　金：国家自然科学基金(50472032;50672105);上海市科学技术委员会半导体照明专项(08DZ1140900)资助课题

摘　　要：通过凝胶固相法在1400℃合成了单掺Mn2+,单掺Cr3+以及双掺Mn2+和Cr3+的镁铝尖晶石粉体。单掺Mn2+离子的样品在450 nm波长激发下有绿光发射(520 nm),单掺Cr3+离子的样品在397 nm波长激发下具有蓝光(450 nm)和红光发射(689 nm),在545 nm波长激发下也有红光发射(689 nm);而双掺的Mg1-xAl2(1-y)O4∶xMn2+,yCr3+粉末在450 nm波长的蓝光激发下,同时具有绿光(515 nm)和红光发射(677 nm,694 nm)。实验发现在共掺杂的镁铝尖晶石体系中Mn2+和Cr3+离子之间存在能量传递,二者可以互为激活中心和敏化中心,其中Mn2+对Cr3+的敏化作用较强。因此这种粉体可以用做蓝光芯片激发的白光LED灯用荧光粉。The Mn,Cr-doped and Mn,Cr-co-doped MgAl2O4 powders were synthesized via a gel-solid reaction method at 1400 ℃.A green emission（520 nm） was obtained when Mn-doped sample was excitated at 450 nm.Whilst a red emission（689 nm） was obtained when Cr-doped sample was excitated both at 397 nm and 545 nm as well as a blue emission（450 nm） when excitated at 397 nm.The co-doped Mg1-xAl2（1-y）O4∶xMn2＋,yCr3＋ powders emit green light（515 nm） and red light（677 nm,694 nm） under pumping at 450 nm.It is found that the energy transfer exists in MgAl2O4 between Mn2＋ and Cr3＋ in the form of mutual energy accepting and donoring,and the Mn2＋ ions have a strong sensitization on Cr3＋.Therefore,MgAl2O4∶Mn2＋,Cr3＋ could be used as a phosphor for white LED with blue LED chip.It is proven that the energy transfer in terms of Mn2＋ to Cr3＋ is by means of radiation and reAbsorption.

关 键 词：材料 荧光粉 镁铝尖晶石 Mn2+离子 Cr3+离子 能量传递 

分 类 号：O482.3[理学—固体物理]