【摘要】 Dy3+离子在可见光范围内的两个主发射分别起源于4F9/2→6H15/2的蓝光和4F9/2→6H13/2的黄光。4F9/2→6H13/2属于超灵敏跃迁,跃迁几率强烈受环境的影响,因此,两种跃迁的分支比随离子所处环境的变化而改变。通过高温熔融的方法制备一系列Dy2O3掺杂的ZnO-B2O3-P2O5玻璃,并计算了Dy3+离子发光的黄、蓝强度比和色坐标。结果表明:随着ZnO百分含量的增加,P2O5百分含量的减小,Dy3+离子发光的黄、蓝强度比减小,同时色坐标趋于白光;而B2O3的作用居中。进一步的研究发现,B2O3在玻璃中的存在方式[BO3]和[BO4]对Dy3+离子发光的黄、蓝强度比的作用不同。[BO3]使Dy3+离子发光的黄、蓝强度比增大,[BO4]则相反。通过固体核磁共振谱和红外光谱的测试,表明所研究的三元系ZnO-B2O3-P2O5玻璃样品,由于P2O5的含量较高,B2O3基本以[BO4]四面体为结构单元,因此Dy3+发光的黄、蓝比与玻璃的组成及百分含量之间存在着上述规律性。更多还原

【Abstract】 Dy3+ activated phosphors had two dominant emission bands in the blue region(～482 nm) and yellow region(～573 nm).The yellow emission of Dy3+ corresponding to 4F9/2→6H13/2(L=2,J=2) was hypersensitive transition which was influenced strongly by the surroundings.It was possible to obtain near-white light by suitably adjusting the yellow-to-blue intensity ratio(Y/B) value of Dy3+-activated material.To investigate the influent factors,ZnO-B2O3-P2O5 glasses doped with Dy2O3 were manufactured by melting at high temperature.It was found that the yellow-to-blue intensity ratio of Dy3+ ions′ luminescence was reduced with increasing the composition of ZnO and decreasing the composition of P2O5,and the chromaticity coordinate of the luminescence of Dy3+ tended to white light synchronously.The influence of B2O3 was intervenient.The father investigation found that the effect of B2O3 was more complicated since B2O3 had two structure units.The structure units of increased the ratio of Y/B,while the structure units of decreased it.The yellow-to-blue intensity ratio of Dy3+ changed orderly in accordance with the composition mentioned above because the structure units of B2O3 in ZnO-B2O3-P2O5 glasses discussed in this paper were almost conformed by the measurement of NMR and IR.更多还原