High-brightness lasing at submicrometer enabled by droop-free fin light-emitting diodes (LEDs).

ABSTRACT: "Efficiency droop," i.e., a decline in brightness of light-emitting diodes (LEDs) at high electrical currents, limits the performance of all commercial LEDs and has limited the output power of submicrometer LEDs and lasers to nanowatts. We present a fin p-n junction LED pixel that eliminates efficiency droop, allowing LED brightness to increase linearly with current. With record current densities of 1000 kA/cm², the LEDs transition to lasing, with brightness over 20 μW. Despite a light extraction efficiency of only 15%, these devices exceed the output power of any previous electrically driven submicrometer LED or laser pixel by 100 to 1000 times while showing comparable external quantum efficiencies. Modeling suggests that spreading of the electron-hole recombination regi

SUBMITTER: Nikoobakht B 

PROVIDER: S-EPMC7428337 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature