Many people believe that the LED was discovered by US researchers working in the 1960s. In fact, Henry Round at Marconi Labs noted the emission of light from a semiconductor diode 100 years ago and, ...

Efficient 1.55 micrometer light sources are needed for telecom and infrared photonics, but realizing them with perovskite quantum dots is challenging due to bandgap limitations. Li et al. used Er3 + ...