Eu2+, Tb3+, Mn2+ Triactivated Ba3MgSi2O8 Red-Emitting Phosphors for Near Ultraviolet Lighting Emitting Diodes
Eu2+, Tb3+, Mn2+ Triactivated Ba3MgSi2O8 Red-Emitting Phosphors for Near Ultraviolet Lighting Emitting Diodes
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DOI：
10.1149/2.038309jss
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发表时间：
2013
影响因子：
2.2
通讯作者：
P. Dai;Xintong Zhang;Haihui Zhao;Xiuli Wang;Xi Chen;Cong Li;Shan Lu;Yichun Liu
中科院分区：
文献类型：
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作者：
P. Dai;Xintong Zhang;Haihui Zhao;Xiuli Wang;Xi Chen;Cong Li;Shan Lu;Yichun Liu
采用高温固相反应法制备了Ba2.99-x Mg0.9Si2 O8(BMS)：0.0 1Eu2+，XTb3+，0.1Mn2+(x=0~0.3)系列荧光粉，通过光致发光(PL)和显微阴极发光(μCL)研究了Tb3+含量对发光性能的影响。无Tb3+样品在437、505和620 nm处观察到三个发射带。Tb3+的掺杂增强了Mn2+在620 nm处的红光发射，同时降低了蓝、绿发射带的强度。当Tb3+含量x=0.2时，红蓝光发射强度比x=0时提高了2.4倍，而绿光发射几乎可以忽略不计。结合荧光显微镜、μ-CL、能谱分析和X-射线衍射仪分析表明，绿光发射是由类Ba2SiO4：Eu2+杂质贡献的，而Tb3+的加入抑制了绿光发射的形成。红蓝比的增加一方面是由于引入了Eu2+→Tb3+→Mn2+这一额外的能量转移途径，提高了Eu2+→Mn2+从Eu2+向Mn2+转移的几率；另一方面也归因于玻璃晶石型BMS相纯度的提高。
A series of Ba 2.99-x Mg 0.9 Si 2 O 8 (BMS): 0.01 Eu 2+, xTb 3+, 0.1 Mn 2+ phosphors (x= 0–0.3) were synthesized via high-temperature solid-state reaction method, and the influence of Tb 3+ content on luminescence properties of the phosphors were investigated by photoluminescence (PL) and micro cathodoluminescence (μ-CL). Three emission bands centered at 437, 505 and 620 nm were observed for Tb 3+ free sample. The doping of Tb 3+ enhanced the red emission of Mn 2+ at 620 nm, and decreased the intensity of the blue and green emission bands simultaneously. At a Tb 3+ content of x= 0.2, the intensity ratio of red to blue emission was enhanced by a factor of 2.4 relative to that of x= 0, and meanwhile the green emission became nearly negligible. A combined analysis with fluorescence microscope, μ-CL, EDAX and XRD manifested that the green emission was contributed by Ba 2 SiO 4: Eu 2+ like impurity, whose formation was inhibited with the incorporation of Tb 3+. The increased red/blue ratio, on the one hand, was attributed to the introduction of an additional energy transfer (ET) route, ie Eu 2+→ Tb 3+→ Mn 2+, besides the Eu 2+→ Mn 2+ route so as to enhance ET probability from Eu 2+ to Mn 2+, as evidenced by PL excitation measurements, and on the other hand was ascribed to improvement of phase purity of glaserite-type BMS.