波长上转换红外探测器在实现大面阵、低暗电流红外探测方面具有很大的发展潜力.短波长光子的发光效率是影响上转换器件效率的重要因素.设计、制作了具有不同发光阱个数的波长上转换红外探测器件，结合器件的红外响应和仿真计算，分析了发光阱个数对波长上转换效率的影响规律.研究结果表明，选择单个发光阱，有利于提高器件的发光效率，从而提高波长上转换效率.

Up-conversion infrared (IR) photodetectors show great potential in large-array and low dark current IR detection due to the advantages of pixelless imaging and being free from thermal mismatch between photodetectors and read-out integrated circuits. The emission efficiency of near-IR photons is one of the important issues that influence the up-conversion efficiency. In this paper, cascade IR up-converters with different numbers of emission quantum wells were designed and fabricated. Based on the IR response measurement and simulation of carrier distribution, the influence of the number of quantum wells on the emission efficiency of near-IR photons was investigated. The experiment results indicate that the near-IR emission efficiency can be improved by adopting single emission quantum well, which consequently improves the up-conversion efficiency.