The influence of Pb-doping on the crystal structure and luminescence properties of LiEuMo2O8 red-emitting phosphors
The influence of Pb-doping on the crystal structure and luminescence properties of LiEuMo2O8 red-emitting phosphors
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Pb掺杂对LiEuMo2O8红光荧光粉晶体结构和发光性能的影响
DOI：
10.1016/j.ceramint.2016.10.133
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发表时间：
2017
影响因子：
5.2
通讯作者：
P. Dai
中科院分区：
文献类型：
--
作者：
P. Dai
显示出610-620 nm的光谱范围和窄线发射的高效红色磷光体有助于实现高显色指数（CRI）和低相关色温（CCT）的磷光体转换白光二极管。因此，由三价铕（Eu 3+）激活的红色磷光体引起了对pc-WLED的新兴趣。本论文采用固相反应法制备了一系列Pb 2+掺杂的LiEuMoO 8红色荧光粉。X射线粉末衍射、吸收光谱和显微拉曼光谱表明，Pb 2+离子的引入使LiEuMo 2 O 8的晶胞体积发生了轻微的膨胀和畸变，并使LiEuMo 2 O 8的电荷转移吸收（CTA）带发生了红移。光致发光和光致发光激发光谱结果表明，Pb 2+离子掺杂到基质晶格中后，Eu 3+的激发效率在近紫外区得到显著提高。当x=0.015时，LiEuMo 2 O 8的红光发射强度增强了50%，在395 nm激发下的内量子产率为53%.从三价铕发光中心的宇称禁戒选择规则的弛豫角度讨论了LiEuMo 2 O 8的红光发射增强，并指出近紫外激发下Pb 2+作为敏化剂对Eu 3+离子的敏化作用可以忽略。
High efficiency red phosphors, showing spectral range of 610–620 nm and a narrow-line emission, are helpful for achieving high color rendering index (CRI) and low correlated color temperature (CCT) phosphor-converted white-light diodes. Red phosphors activated by trivalent europium (Eu3+) thus have attracted a renewed interest for pc-WLEDs. In our case, we prepare a series of Pb2+-doped LiEuMoO8red-emitting phosphors by solid-state reactions. The introduction of Pb2+ions expands and distorts slightly the unit cell volume of LiEuMo2O8matrix, and red-shifts the charge transfer absorption (CTA) band of LiEuMo2O8, which are demonstrated by X-ray powder diffraction, absorption spectra and micro-Raman spectra. Photoluminescence and photoluminescence excitation spectra results show that the excitation efficiency of Eu3+is improved significantly in the near ultraviolet region when Pb2+ions are doped into the host lattice. At x=0.015, the red-emitting intensity of LiEuMo2O8is enhanced by 50%, and the internal quantum yields is 53% under excitation at 395 nm. The enhanced red emission is discussed in term of the relaxation of parity-forbidden selection rules for trivalent europium luminescent center, and the sensitization effect of Pb2+as a sensitizer for Eu3+ions is negligible in LiEuMo2O8under near ultraviolet excitation.
影响因子：
16.6
作者：
Daicho, Hisayoshi;Iwasaki, Takeshi;Hosono, Hideo
通讯作者：
Hosono, Hideo