Broadband Cr^3+-sensitized upconversion luminescence in La_3Ga_5GeO_14: Cr^3+,Yb^3+,Er^3+
Broadband Cr^3+-sensitized upconversion luminescence in La_3Ga_5GeO_14: Cr^3+,Yb^3+,Er^3+
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DOI：
10.1364/ome.4.000638
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发表时间：
2014-04
影响因子：
2.8
通讯作者：
S. Ye;E. Song;E. Ma;S. J. Zhang;Jianping Wang;Xianqiang Chen;Qianhuan Zhang;J. Qiu
中科院分区：
文献类型：
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作者：
S. Ye;E. Song;E. Ma;S. J. Zhang;Jianping Wang;Xianqiang Chen;Qianhuan Zhang;J. Qiu
报道了La3Ga5GeO14:Cr3+,Yb3+,Er3+中的宽带光敏上转换(UC)光子管理现象，其特点是在室温下可激发集中的宽带非相干光。 Stokes 和 UC 发光过程中 Cr3+/Yb3+/Er3+ 之间的能量转移表明，Yb3+ 作为“桥梁”对于 Cr3+ 敏化 Er3+ 的 UC 发光是必需的。低 Cr3+ 含量对于 Yb3+-Er3+ 的 UC 发光是优选的，因为它会被高 Cr3+ 含量猝灭。根据晶体学数据和Er3+ UC发射的衰减曲线，基于具有超交换相互作用的Cr3+-Yb3+二聚体模型，提出了在510 ~560 nm附近设计的Er3+ UC发射2H11/2→4I15/2和4S3/2→4I15/2。这项研究可能为设计可通过宽带非相干光激发的新型光子材料以改善太阳能电池的光响应开辟新的视角。
Broadband-light-sensitized upconversion (UC) photon management phenomenon in La3Ga5GeO14:Cr3+,Yb3+,Er3+ is reported, featuring the concentrated broadband noncoherent light excitable at room temperature. Energy transfer among Cr3+/Yb3+/Er3+ in the Stokes and UC luminescence processes reveals that Yb3+ as a “bridge” is requisite for Cr3+-sensitized UC luminescence of Er3+. Low Cr3+ contents are preferred for UC luminescence of Yb3+-Er3+, since it would be quenched by high Cr3+ contents. The designed UC emissions 2H11/2→4I15/2 and 4S3/2→4I15/2 of Er3+ at around 510 ~560 nm are proposed to through Energy transfer upconversion (ETU) mechanism based on the Cr3+-Yb3+ dimer model with superexchange interaction according to crystallographic data and the decay curves of Er3+ UC emission. This research may open up a new perspective to design novel photonic materials excitable by broadband noncoherent light for improving the photoresponse of solar cells.