Zhou Jiajia, Teng Yu, Liu Xiaofeng, Ye Song, Xu Xiaoqiu, Ma Zhijun, Qiu Jianrong
State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China.
Opt Express. 2010 Oct 11;18(21):21663-8. doi: 10.1364/OE.18.021663.
We report on conversion of near-ultraviolet and visible radiation ranging from 250 to 500 nm into near-infrared emission by a Ca(8)Mg(SiO(4))(4)Cl(2): Eu(2+), Er(3+) phosphor. Efficient 1530-1560 nm Er(3+) emission ((4)I(13/2)-->(4)I(15/2)) was detected under the excitation of Eu(2+) (4f?5d) absorption band as a result of energy transfer from Eu(2+) to Er(3+), which is confirmed by both steady state and time-resolved emission spectra. The laser power dependent emission intensity changes were investigated to analysis the energy transfer mechanism. Energy transfer from Eu(2+) to Er(3+) followed by a multi-photon quantum cutting of Er(3+) is proposed. The result indicates that the phosphor has potential application in enhancement of conversion efficient of germanium solar cells because the energy difference of Er(3+): (4)I(13/2)-->(4)I(15/2) transition matches well with the bandgap of Ge (Eg~0.785 eV).
我们报道了一种Ca(8)Mg(SiO(4))(4)Cl(2): Eu(2+), Er(3+)荧光粉将250至500纳米范围内的近紫外和可见光转换为近红外发射的情况。在Eu(2+)（4f?5d）吸收带的激发下，由于能量从Eu(2+)转移到Er(3+)，检测到了高效的1530 - 1560纳米Er(3+)发射（(4)I(13/2)-->(4)I(15/2)），稳态和时间分辨发射光谱均证实了这一点。研究了激光功率依赖的发射强度变化以分析能量转移机制。提出了从Eu(2+)到Er(3+)的能量转移，随后是Er(3+)的多光子量子切割。结果表明，该荧光粉在提高锗太阳能电池的转换效率方面具有潜在应用，因为Er(3+)：(4)I(13/2)-->(4)I(15/2)跃迁的能量差与Ge的带隙（Eg~0.785 eV）匹配良好。
