Photoluminescence of Mn2+ Centers in Chalcohalide Glasses
Photoluminescence of Mn2+ Centers in Chalcohalide Glasses
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DOI：
10.1111/j.1551-2916.2010.04356.x
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发表时间：
2011-03
影响因子：
3.9
通讯作者：
Qiqi Yan;Yinyao Liu;Guorong Chen;N. Da;L. Wondraczek
中科院分区：
文献类型：
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作者：
Qiqi Yan;Yinyao Liu;Guorong Chen;N. Da;L. Wondraczek
报道了GeS_2-Ga_2S_3-CsCl系掺锰硫卤化物玻璃的光致发光。在447 nm蓝光激发下，在500~600 nm的绿色光谱范围内出现一个宽的发射带，表明存在四面体配位的Mn2+物种。当Mn2+浓度增加到2mol%时，在约610-660 nm处产生一个强度越来越大的二次发射带。同时，绿光带的强度逐渐减小，并向红光方向移动，导致了500~750 nm的非常平坦的发光，这为白光发射提供了一种很有前途的光源。对于Mn2+这种独特的发光行为的起源，提出了目前硫卤化物玻璃中Mn2+的配位数经历了从四面体配位到八面体配位的部分变化。
We report on photoluminescence from Mn2+-doped chalcohalide glasses of the GeS2–Ga2S3–CsCl system. Upon blue excitation at 447 nm, a broad emission band occurs in the green spectral range from 500 to 600 nm, indicating the presence of tetrahedrally coordinated Mn2+ species. When the Mn2+-concentration is increased up to 2 mol%, an increasingly intense secondary emission band evolves at about 610–660 nm. Meanwhile, the intensity of the green band decreases gradually and shifts toward the red, resulting a very flatten luminescence from 500 to 750 nm, which provides a promising white light emitting source. As for the origin of this unique luminescence behavior of Mn2+, it is proposed that the ligand coordination number of Mn2+ in the present chalcohalide glasses experiences a partial change from tetrahedral to octahedral coordination.