Display with 31% external quantum efficiency harvests ambient light at 26.7% efficiency when not in active use; both records

https://www.eurekalert.org/news-releases/1126123

"grow perovskite through porous nanoparticle alumina islands, maintaining electrical connection while structure acts like light diffuser... because material has few defects, photon re-absorbed/ re-emitted (re-cycled) until finds way out, recycling energy otherwise lost as heat... assembly molecules repair tiny defects, enabling 95% efficiency retention (was 67%) after 1,200 hours continuous use... massive step toward bifacial energy systems and smart displays, without sacrificing durability for performance"