Negative luminescence allows data to be transmitted while remaining invisible to conventional observation

https://www.unsw.edu.au/newsroom/news/2026/03/New-negative-light-technology-hides-data-transfers-in-plain-sight

"blends mid- IR LED signals into natural thermal background radiation hiding them, instead of usual making signals brighter than background... thermoradiative diode quickly switches between slightly brighter/ darker than surrounding making seem as background noise... 100 kB/s data transfer rates, but commercial products reaching: Mbps by improving emitter, Gb/s or 100s Gb/s by utilizing highly conductive materials like graphene... high-security applications in defense and finance"