Ultralow-voltage operation of light-emitting diodes.

ABSTRACT: For a light-emitting diode (LED) to generate light, the minimum voltage required is widely considered to be the emitter's bandgap divided by the elementary charge. Here we show for many classes of LEDs, including those based on perovskite, organic, quantum-dot and III-V semiconductors, light emission can be observed at record-low voltages of 36-60% of their bandgaps, exhibiting a large apparent energy gain of 0.6-1.4 eV per photon. For 17 types of LEDs with different modes of charge injection and recombination (dark saturation currents of ~10^-39-10^-15mA cm^-2), their emission intensity-voltage curves under low voltages show similar behaviours. These observations and their consistency with the diode simulations suggest the ultralow-voltage electroluminescenc

SUBMITTER: Lian Y 

PROVIDER: S-EPMC9253117 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature