Light Emitting Diode (LED) work on principle of:

In which one of the following devices, the light energy is converted into the electrical energy?

Which of the following diode is used in ultra-high speed switching electronic circuits?

Organic Light Emitting Diodes (OLEDs) are used to create digital displays in many devices. What are the advantages of OLED displays over Liquid Crystal displays? 1. OLED displays can be fabricated on…

On heating, the resistance of a semiconductor :

Which of the following technique cannot be used for generating electron-hole pairs in electronic devices?