采用固相反应法合成了掺杂三价铽离子的邻苯二甲酸锌发光材料，测定了其晶体结构、发射光谱和激发光谱．研究了发光强度和发射带及激发带的半宽度与铽离子浓度的关系．提出了从邻苯二甲酸根π，π和n,π*态到Tb3+离子5D4能级的能量传递过程有两个途径：（1）由S1π，π*态直接传递到Tb3+离子5Hi能级，然后经过无辐射跃迁弛豫到5D3能级，再转移给乃T1π,π*态，最后传递到5D4能级；（2）由S1π，π*和Sin，π*态经系间跨越衰减到T1π,π*和T1n，π*态，然后再传递到Tb3+离子的5D4能级．
The Tb3+-doped zinc phthalate (ZnPht:Tb) phosphor was prepared by the solid phase reaction of zinc oxide and phthalic anhydride in the saturated water vapor
at 80～100℃. The crystal structure, emission and excitation spectra were determined. The dependence of the fluorescent spectrum properties on the Tb3+
ion concentration was investigated. The energy transfer mechanism from π,π* and n,π* excited states of Pht2- radical to 5D4 energy level of Tb3+
ion was revealed: (1) S1(π,π*, n,π*)→(5Hj,5Lj)→5D3→ T1(π,π*, n,π*)→5H4; (2) S1(π,π*, n,π*)→ T1(π,π*, n,π*)→5H4.
参考文献
| [1] | 孙聚堂. 发光学报, 1994, 15 (3): 242--248 2 Schuckmann W, Fuess H, Bats J W. Acta Cryst., 1978, B34: 3754--3756 3 孙聚堂, 彭正合, 杜秀珍, 王清叶. 化学学报, 1991, 49: 1094--1098 4 陈国珍, 黄贤智, 郑朱梓, 许金钩, 王尊本. 荧光分析法, 北京: 第二版. 科学出版社, 1990. 43--45 5 Carnall W T, Fields P R, Rajnak K. J. Chem. Phys., 1968, 49 (10): 4447--4449 |
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