在玻璃基片表面制作了Coumarin 500、Coumarin 540和Rhodamine 6G 3种染料掺杂的聚合物薄膜, 并以市售LED灯和氙灯为光源, 实验研究了单一染料掺杂和混合染料掺杂的聚合物薄膜的吸收光谱、荧光光谱及其光谱下转换的特征。研究结果表明: 这种多染料掺杂的聚合物薄膜能够吸收350～550 nm波长范围内的光子并将其转换至波长为580 nm左右的光子。在一定的浓度范围内, 较高的染料浓度能够获得较高的下转换光子输出。由于Nd3+/Yb3+共掺玻璃中Nd3+离子在 580 nm 附近有一个较强的吸收峰, 这种染料掺杂聚合物薄膜的光谱下转换有助于提高Nd3+/Yb3+共掺玻璃对太阳光中蓝绿光的吸收并通过共振能量转移激发Yb3+离子的近红外发光, 对提高单晶硅太阳能电池的综合光伏转换效率有潜在的应用价值。

Polymer films doped by Coumarin 500, Coumarin 540 and Rhodamine 6G dyes were fabricated on glass. The absorption spectra, fluorescence spectra and down-conversion characteristics of these films were experimentally studied using LED and xenon lamps as illumination sources. The photons from 350 nm to 550 nm can be down-converted to photons of 580 nm by these dye-doped polymer films. Higher dopant concentrations within certain range, more photons can be down-converted. Since Nd3+ in Nd3+/Yb3+ co-doped glass has a strong absorption band around 580 nm, these dye-doped polymer films are helpful to enhance absorption of blue and green light and convert them to near infrared emission of Yb3+ through resonance energy transfer. These films can be potentially used to improve the compositive photovoltaic conversion efficiency of crystalline silicon solar cells.