摘要:
研究了五磷酸铒ErP5O14非晶玻璃的红外量子剪裁现象.从吸收谱和激发光谱的计算比较中肯定了ErP5O14非晶玻璃的1537.0 nm红外荧光为多光子量子剪裁荧光.从ErP5O14非晶玻璃的可见和红外荧光发射光谱中发现,激发2H11/2,4G11/2和4G9/2能级所导致的I13/2→-I15/2量子剪裁红外荧光很强;基于自发辐射速率、无辐射弛豫速率和能量传递速率等参数的计算,对其量子剪裁机理进行了分析.发现起源于基态的强下转换能量传递{2H11/2→4I9/2,4I15/2→4I（13/2）},{4G11/2→4I13/2,4I15/2→-2H11/2},{4G9/2）→4F7/2,4I15/2→4I13/2}和{4G9/2→4I（13/2）,4I15/2→2H11/2}是导致ErP5O14非晶玻璃具有强的三光子和四光子量子剪裁红外荧光的原因.研究结果对改善太阳能电池效率有一定意义.
Abstract:
The infrared quantum cutting phenomena on ErP5O14 noncrystalline glass is studied in the present paper.The 1537.0 nm infrared fluorescence of ErP5O14 noncrystalline glass is confirmed to be the multi-photon quantum cutting fluorescence by computation and comparison between absorption and excitation spectra.It is found that the 4I13/2→4I15/2 quantum cutting fluorescence is very strong,induced by the excited 2H11/2,4G11/2 and 4G9/2 energy levels.Its mechanism is thoroughly analyzed based on the calculation of spontaneous emission rates,nonradiative multiphonon relaxation rates and energy transfer rates.It is found the strong downconversion energy transfers {2H（11/2）→4I9/2,4I15/2→4 I13/2},{4G11/2→4 I13/2,4I15/2→2H11/2}.{4G9/2→4 F7/2, 4I15/2→4I13/2}和{4G9/2→4I13/2,4I15/2→2H11/2} are responsible for the strong infrared three-photon and four-photon quantum cutting fluorescence of ErP5O14 noncrystalline glass.The present research is significant for enhancing solar cell efficiency.
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