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近紫外激发NaGd(WO4)2:Ln3+(Ln=Tb, Dy, Sm, Eu)荧光粉的微波水热合成及发光性能
作者:翟永清1 孙庆琳1  昌2 邓德芮1 胡正磊1 荆雪蒙1 厉志鹏1 
单位:1. 河北大学化学与环境科学学院 河北 保定 071002 2. 河北农业大学渤海校区理工学院 河北 沧州 061100 
关键词:钨酸钆钠 微波水热合成 近紫外激发 发光性能 
分类号:O482.31
出版年,卷(期):页码:2018,46(10):0-0
DOI:10.14062/j.issn.0454-5648.2018.10.17
摘要:

 :采用微波水热合成法,在不添加任何表面活性剂或者模版的条件下,快速合成了系列NaGd(WO4)2:Ln3+(Ln=Tb, Dy, Sm,

Eu)荧光粉。探讨了pH 值、反应温度和反应时间对样品物相结构、微观形貌及发光性能的影响。结果表明:反应体系pH 值
为8.0,在180 ℃下反应60 min 即可合成四方晶系NaGd(WO4)2 的纯相,且结晶良好,形貌为规整的四方盘。所合成的
NaGd(WO4)2:Ln3+ 系列荧光粉的激发光谱均由两部分组成:200~300 nm 的宽激发带归属于W–O、Ln–O 之间的电荷转移;
300~500 nm 的系列尖峰归属于Ln3+的特征f–f 跃迁。系列样品均可被近紫外光有效激发,当Ln3+为Tb3+、Dy3+、Sm3+和Eu3+
时,分别呈现绿、黄、橙红和红光发射。
A series of NaGd(WO4)2:Ln3+ (Ln=Tb, Dy, Sm, Eu) phosphors were synthesized by microwave-hydrothermal method
without adding any surfactant or template. The effects of pH value, reaction temperature and reaction time on the phase structure,
morphology and luminescent properties of the samples were investigated. The results indicate that the pure phase of tetragonal
NaGd(WO4)2 can be synthesized rapidly by adjusting the pH value of system to 8.0 and reacting at 180 ℃ for 60 min. The products
have good crystallinity and present well-defined square plate morphology. All the excitation spectra of as-synthesized
NaGd(WO4)2:Ln3+ phosphors are composed of two parts: the broad band between 200 nm and 300 nm, which is ascribed to the charge
transfer band of W–O and Ln–O; a series of sharp lines in the range of 300–500 nm, which is due to the characteristic f–f transitions
of Ln3+. NaGd(WO4)2:Ln3+ phosphors can be excited effectively by near-UV light and exhibit bright green-, yellow-, orange-red- and
red-emitting, respectively for Tb3+, Dy3+, Sm3+ and Eu3+ as luminescent center.
 
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参考文献:

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