分别利用高温固相法、共沉淀法以及燃烧法合成了六方晶系纤锌矿结构的ZnO:Eu3+荧光粉,探讨了近紫外光激发下不同方法获得样品的发光性质。当监测Eu3+ 610nm发射时,观测到200~250nm和370nm两处宽带,分别对应于Eu—O电荷迁移和ZnO。在近紫外光激发下,这些粉体材料都具有来自Eu3+的5D0-7Fj组态内跃迁线状发射以及与基质缺陷相关的宽带发射。比较不同的合成方法的样品发光,发现不同合成方法能量传递效率不同。固相法合成的材料ZnO:Eu3+中引入Li+有利于ZnO向稀土Eu3+的能量传递的进行。由于在近紫外区的有效吸收,此材料在近紫外激发发光二极管的应用上良好前景。
Hexagonal crystal system luminescent materials ZnO: Eu3+ were synthesized by solid state method, co-precipitation method and combustion method, respectively. high temperature The luminescent properties of as-prepared samples were characterized by photoluminescence spectrum. The excitation spectrum, suspected 610 nm of the transitions of Eu3+ , shows a broad intense band ranging from 200-250 nm and about 370 nm, which is ascribed to charge transfer band of Eu-O and ZnO, respectively. The excitation spectra results indicate that the energy transfer from ZnO to Eu3 +. The emission spectrum of the phosphor is composed of broad band from ZnO and 5Do-TFi transitions of Eu3+. Li codoped in ZnO: Eu3+ synthsized by solid state method facilite the transfer. The different samples by different method have different energy transfer efficiencies. Based on thess properties, the materials may have promising for applications in LED.