红色长余辉材料Zn_3(PO_4)_2:Mn^(2+),Ga^(3+)的合成及光谱性质  

Preparation and Spectral Properties of Zn_3(PO_4)_2∶Mn^(2+),Ga^(3+)

作　　者：宋艳华[1] 甘树才[1] 邓岳锋[2] 洪广言[2] 孟健[2] 

机构地区：[1]吉林大学化学学院化工与应用化学系,吉林长春130026 [2]中国科学院长春应用化学研究所稀土化学与物理重点实验室,吉林长春130022

出　　处：《发光学报》2006年第4期484-488,共5页Chinese Journal of Luminescence

基　　金：中科院长春应用化学研究所稀土化学与物理重点实验室开放课题资助项目(R020202K)

摘　　要：采用高温固相法合成α、β和γ-Zn3(PO4)2∶Mn2+,Ga3+(ZPMG),XRD分析表明,高温合成过程中淬火条件有利于β相的形成,退火条件有利于γ相的形成。三种磷光粉的激发光谱分别位于246 nm(α)、234nm(β和γ)的宽带谱。α相的发射光谱为位于508 nm的锐线谱,β和γ相的发射光谱均存在两个谱带,分别位于508 nm的绿色光谱区和616 nm的红色光谱区。两种发射均归属为Mn2+的4T1(4G)→6A1g(6S)跃迁,但是由于Mn2+在Zn3(PO4)2结构中的配位数不同,故发光颜色及强度均不同。对于余辉发射,只能观察到红色余辉光谱。Since the green long persistent phosphor SrAlO4： Eu^2＋, Dy^3＋ was reported in 1996, scientists focused their attention on rare earth doped aluminate, silicate or sulfide system. However, transition metal ions, e.g. , Mn^2＋ , which shows efficient luminescence and highly-saturated color in many compounds, can act as efficient emission center for luminescent materials. Zinc orthophosphate has three crystalline modifications, labled as α, β and γ crystal phases. The red long-lasting phosphorescent properties of β- Zn3 （PO4 ）2： Mn0.05^2＋ M^3＋ , （ M = Al, Ga） have been reported by J. Wang, however, the phosphorescent properties of γ- Zn3 （ PO4 ） 2： Mn0.05^2＋, Ga3 ＋ were not reported up to now. The preparation of γ- Zn3 （ PO4 ） 2： Mn0.05, Ga3 have two processes： firstly, the stoichiometric amounts of raw materials were thoroughly mixed and ground in an agate mortar. Then the mixtures were pre-fired at 500 ℃ for 3 h; secondly, the pre-fired samples were thoroughly reground again, then sintered at 850 ℃ for three hours under a thermal-carbon reducing atmosphere by solid-state reaction. The XRD spectra show that, when the concentration of Mn^2＋〉 0. 3%, quenching is contributed to the formation of β phase, but anneal is propitious to the formation of γ phase. The excitation and emission spectra show that, The three forms are excited at 234 nm （α）, and 246 nm （ β and γ）, with emission peaks at 507 nm for α form, sharp peaks at both 507 nm and 616 nm for β, and sharp peak at 507 nm and weak peak at 616 nm for γ form. Both the two typical peaks are attributed to the Mn^2＋ ion emits green light when is tetrahedrally coordinated （CN = 4） in the lattice whereas it emits red light in octahedral coordination （CN = 6）. According to the long-lasting phosphorescence and decay measurement results, there is no long-lasting phosphorescent phenomenon in the α form, because there is no octahedrally coordinated Mn^2＋ in this structure. For the β and γ

关 键 词：相转变 红色长余辉发光材料 MN^2+ 光谱性质 

分 类 号：O482.31[理学—固体物理] O644[理学—物理]