Electroluminescence from μLED without external charge injection

Stable electroluminescence from micro-pixelated light-emitting diode ( μ LED) occurs when electrons and holes are continuously injected from external electrodes. Different from the general recognition, in this work, μ LED works in an operation mode, namely, non-electrical contact and non-carrier injection mode, and can be ‘wirelessly’ lit up without external charge injection, which is different from the general recognition. Inherent holes and electrons in μ LEDs can provide sufficient carriers for radiative recombination under alternating-current electric field. A possible model related to the diffusion of majority carrier and the drift of minority carrier in μ LED was proposed, which is further confirmed by the employment of a ‘carrier pump’. Finally, the intrinsic characteristics of the device-in-capacitor, namely, self-protection against electrical breakdown, were discussed. This work demonstrates a new device configuration and an alternative operating mode for μ LED and provides a research manner to obtain advanced μ LED-based technology.