a, Device structure and b, schematic energy band diagram of a hybrid LED. c, EL spectra, d, current density-voltage, e, luminance-voltage and f, EQE- current density characteristics of the PeLED, OLED ...

The organic light-emitting diode (OLED) technology behind flexible cell phones, curved monitors, and televisions could one day be used to make on-skin sensors that show changes in temperature, blood ...