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.
维普
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