采用 Ce(3+)-Er(3+)共掺钇铝石榴石实现从可见光到近红外辐射的宽带光谱修饰。

Broadband spectral modification from visible light to near-infrared radiation using Ce(3+)-Er(3+) codoped yttrium aluminium garnet.

机构信息

State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China.

出版信息

Phys Chem Chem Phys. 2010 Nov 7;12(41):13759-62. doi: 10.1039/c0cp00204f. Epub 2010 Sep 27.

PMID:20871892

Abstract

Broadband spectral conversion from visible light to near-infrared radiation in Ce(3+)-Er(3+) codoped yttrium aluminium garnet is reported. Excitation, emission, time-resolved luminescence spectra and fluorescence decay curves have been measured to prove the energy transfer from Ce(3+) to Er(3+). The broadband and strong absorption of Ce(3+), efficient energy transfer from Ce(3+) to Er(3+), and three-photon quantum cutting process in Er(3+) ions result in efficient near-infrared emission when excited by 400-500 nm broad visible light. The energy of the Er(3+) ((4)I(13/2)→(4)I(15/2)) transition matches well with the band gap of germanium (Eg ∼ 0.785 eV). Ce(3+)-Er(3+) codoped yttrium aluminium garnet is promising for the enhancement of conversion efficiency of germanium solar cells.

摘要

报道了 Ce(3+)-Er(3+)共掺钇铝石榴石中可见光到近红外辐射的宽带光谱转换。测量了激发、发射、时间分辨荧光光谱和荧光衰减曲线，以证明 Ce(3+)到 Er(3+)的能量转移。Ce(3+)的宽带和强吸收、Ce(3+)到 Er(3+)的有效能量转移以及 Er(3+)离子中的三光子量子切割过程导致在 400-500nm 宽可见光激发下产生有效的近红外发射。Er(3+)的能量（(4)I(13/2)→(4)I(15/2)）跃迁与锗的能带隙（Eg∼0.785eV）非常匹配。Ce(3+)-Er(3+)共掺钇铝石榴石有望提高锗太阳能电池的转换效率。