Bright and Low Driving Voltage Top-Emitting Organic Light Emitting Diodes on Silicon

To match the driving voltage (3-5 V) of the driving circuits on silicon, we report an organic light-emitting device on silicon substrate featuring low turn-on voltage, high brightness. The fluorescent Alq3-based top-emitting organic lightemitting device with MoOx doped hole injecting layer shows a low turn-on voltage (voltage at the luminance of 1 cd/m2) of about 2.5 V and the brightness reaches 280 cd/m2 and 1400 cd/m2 at 4 V and 5 V, respectively. More importantly, we generated angular dependent electroluminescent spectra from the devices on silicon with narrow bandwidths which are crucial for encryption of visible light communication and may be useful for bio-light interaction.