Hydrothermal-assisted ion exchange synthesis and photoluminescence of Li+ and Eu3+ co-doped NaLa(WO4)2 as near-UV type red phosphors
Hydrothermal-assisted ion exchange synthesis and photoluminescence of Li+ and Eu3+ co-doped NaLa(WO4)2 as near-UV type red phosphors
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DOI：
10.1016/j.jlumin.2011.12.069
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发表时间：
2012-05
影响因子：
3.6
通讯作者：
Y. Liu;Zhou-guang Lu;Yingying Gu;W. Li
中科院分区：
文献类型：
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作者：
Y. Liu;Zhou-guang Lu;Yingying Gu;W. Li
在水热条件下，用离子交换法制备了一系列Li+和Eu3+共掺的双钨酸盐NaLa(WO4)2(NLW)红色荧光粉。利用X射线衍射仪、透射电子显微镜和光致发光光谱研究了Li+掺杂浓度对其晶体结构、形貌和光致发光性能的影响。结果表明，样品为纯白钨矿相结构，颗粒形态为球形。此外，室温光致发光光谱表明，光亮度高度依赖于Li+的掺杂浓度，这是由离子交换时间和LiNO3的前驱体浓度决定的。当在晶格中引入5%的Li+离子时，发光强度比未掺杂时提高了10倍以上。此外，Li+的共掺杂可以显著提高NaLa(WO4)2：Eu3+荧光粉在近紫外区的有效激发。
A series of Li+and Eu3+co-doped double tungstate NaLa(WO4)2(NLW) red phosphors have been successfully synthesized by an ion exchange method under a hydrothermal condition. The effects of Li+doping concentration on the crystal structure, morphology and photoluminescence properties were investigated using the XRD, TEM and photoluminescence (PL) measurements. The results reveal that the samples have phase-pure scheelite structure and adopt spherical particle morphology. Furthermore, room temperature PL spectrum shows that the optical brightness is highly dependent on the concentration of doping Li+, which is determined by ion exchange duration and the precursor concentration of LiNO3. As 5% Li+ions was introduced into the crystal lattice, the emission intensity was enhanced by more than 10-fold as compared with the pristine one. Moreover, the co-doping of Li+can substantially improve the effective excitation of the NaLa(WO4)2:Eu3+phosphors under near-UV region.