高性能宽谱上转换成像发光二极管性能优化

Performance optimization of light-emitting diodes for high-performance broadband upconversion imaging

摘要:

高性能宽谱上转换成像器件在医疗、食品安全、无损检测和国家安全等领域中发挥着重要作用，但现有半导体上转换器件因探测范围窄、上转换效率低而受到限制。为实现更宽谱和高效的上转换，本文通过优化LED结构，显著提升了棘轮上转换器件的性能。改进后的LED发光效率提升了2个数量级，μA量级的驱动电流下即可开启发光，发光光谱更接近规则洛伦兹线型，器件整体面发光均匀性也显著提升。研究明确了性能优化原则，并为未来上转换器件的改进提供了参考方向。

Abstract:

High-performance wide-spectrum upconversion imaging devices play an important role in fields such as medical care, food safety, non-destructive testing, and national security. However, existing semiconductor upconversion devices are limited by their narrow detection range and low upconversion efficiency. In order to achieve a wider spectrum and efficient upconversion, this study significantly improves the performance of the ratchet upconversion device by optimizing the LED structure. The improved LED's electroluminescence efficiency has been increased by two orders of magnitude. It can turn on light at a driving current of μA level, and its electroluminescence spectrum is closer to the theoretical regular Lorentz line. The overall surface luminescence uniformity of the device is also significantly improved. The research clarifies the performance optimization principles and provides a reference for future improvements in upconversion devices.