High-efficiency integrated MIR band to visible band upconversion optoelectronic system

Abstract

This study offers and explores an ultra-high efficiency up-converter to convert three mid-infrared frequency bands to three visible frequency bands. Our purpose is to explore frequency analysis in the up-conversion process. In our suggested band-to-band up-conversion device, the time-varying mid-infrared light signals are converted into time-varying electrical currents; these time-varying electrical currents are amplified by the transistor. Finally, these amplified currents produce time-varying visible light currents and power through the usage of organic light-emitting diodes (LEDs). This up-conversion device includes: (1) Doped nanocrystalline layers of PbSe, CdSe, and CdTe as photodetectors to detect three different central frequencies of 100, 70, and 56[Formula: see text]THz, (2) the NPN BJT as a current amplifier and output quantum efficiency (QE) improvement, (3) blue, green, red organic LEDs for producing visible light currents and powers; these OLEDs operate at central frequencies of 667, 545, and 484 THz, respectively. In this investigation, narrow-band mid-infrared light is converted into broadband visible light considering conventional LEDs. The mid-infrared input optical signal with a bandwidth of 0.004, 0.0006, and 0.004 THz is converted to visible optical bandwidth of 0.425, 0.52, and 0.37 THz, respectively. The output QE of the proposed structure for the frequency of 100, 70, and 56 THz is [Formula: see text]%, [Formula: see text]%, and [Formula: see text]%, respectively. The results indicate more excellent QE than other research. Also, it is the first study about the frequency response of the up-conversion device to convert narrowband mid-infrared lights into broadband visible lights.