Dysprosium doped novel apatite-type white-emitting phosphor Ca9La(PO4)5(GeO4)F2 with satisfactory thermal properties for n-UV w-LEDs
Dysprosium doped novel apatite-type white-emitting phosphor Ca9La(PO4)5(GeO4)F2 with satisfactory thermal properties for n-UV w-LEDs
复制标题
DOI：
10.1016/j.dyepig.2016.11.011
复制
发表时间：
2017-04
影响因子：
4.5
通讯作者：
Yuanyuan Zhang;L. Mei;Haikun Liu;Dan Yang;L. Liao;Zhaohui Huang
中科院分区：
文献类型：
--
作者：
Yuanyuan Zhang;L. Mei;Haikun Liu;Dan Yang;L. Liao;Zhaohui Huang
采用简便的固相技术合成了p63 /mspace基团六方晶格的磷灰石结构荧光粉Ca9La(PO4)5(GeO4)F2:Dy3+(CLPGF:Dy3+)。详细研究了晶体结构、局部精细结构及其光致发光性能。CLPGF:Dy3+荧光粉能在290 ~ 475 nm的紫外可见光谱区吸收，并表现出以485和580 nm为中心的两个强发射带，分别属于Dy3+的4f9 /2→6h15 /2和4f9 /2→6h13 /2跃迁。Dy3+发射的浓度猝灭是通过最近邻离子之间的能量传递发生的，其猝灭机制被证实为偶极-偶极相互作用。荧光体的量子效率为72.9%，室温时的发光强度为初始值的93.8%和98.6%，分别对应于Dy3+离子的4f9 /2到6h15 /2的转变和4f9 /2到6h13 /2的转变。其有趣的光致发光特性表明，CLPGF:Dy3+荧光粉是一种很有前途的发光白光候选材料。
A novel apatite structure phosphor Ca9La(PO4)5(GeO4)F2:Dy3+(CLPGF:Dy3+) with a hexagonal lattice in theP63/mspace group was synthesized via a facile solid state technique. The crystal and fine local structure as well as their photoluminescence properties were investigated in detail. The CLPGF:Dy3+phosphor can absorb in the UV-vis spectral region of 290–475 nm and exhibit two intense emission bands centered at 485 and 580 nm, which ascribes to4F9/2→6H15/2and4F9/2→6H13/2transitions of Dy3+, respectively. The concentration quenching of Dy3+emission occurs via the energy transfer among the nearest-neighbor ions and the corresponding quenching mechanism was verified to be the dipole-dipole interaction. The quantum efficiencies of the phosphors were examined to be 72.9% and its luminescence intensity at 150 °C decreases to 93.8% and 98.6% of the initial value at room temperature, which corresponds to4F9/2to6H15/2transition and4F9/2to6H13/2transition of Dy3+ions, respectively. Their interesting photoluminescence properties indicate that the CLPGF:Dy3+phosphor is a promising white-emitting candidate forw-LEDs applications.