Photoluminescence properties of Eu2+-activated CaSi2O2N2: Redshift and concentration quenching
Photoluminescence properties of Eu2+-activated CaSi2O2N2: Redshift and concentration quenching
复制标题
DOI：
10.1063/1.3190522
复制
发表时间：
2009-08
影响因子：
3.2
通讯作者：
Xiufeng Song;R. Fu;S. Agathopoulos;Hong-Qing He;Xinran Zhao;Shaodong Zhang
中科院分区：
文献类型：
--
作者：
Xiufeng Song;R. Fu;S. Agathopoulos;Hong-Qing He;Xinran Zhao;Shaodong Zhang
采用固相反应法合成了高效的CaSi 2 O2 N2：Eu 2+绿色荧光粉。所产生的磷光体被波长在300和460 nm之间的UV-可见光有效地激发，并发射以538 nm为中心的单一、强烈和宽的发射带。实验结果和分析表明，Eu 2+离子间的偶极-偶极相互作用是能量转移的主要机制，随着Eu 2+离子浓度的增加，发射光谱向长波方向移动。Eu 2+的猝灭浓度（即，其中发射强度最大）约为2At。%.因此，所产生的CaSi 2 O2 N2：Eu 2+绿色磷光体适合于进一步考虑和实验，以用于白色发光二极管中的潜在用途。
Highly efficient CaSi2O2N2:Eu2+ green phosphors were synthesized via solid-state reaction method. The produced phosphors are effectively excited with UV-vis light of wavelength between 300 and 460 nm and emit a single, intense, and broad emission band centered at 538 nm. The experimental results and their analysis suggest that the energy transfer mechanism should occur due to dipole-dipole interactions among Eu2+ ions, resulting in a shift in emission spectrum toward longer wavelengths with increasing Eu2+ concentration. The quenching concentration of Eu2+ (i.e., where the emission intensity maximizes) is approximately 2 at. %. Accordingly, the produced CaSi2O2N2:Eu2+ green phosphors are qualified for further consideration and experimentation for potential use in white light emitting diodes.