Q.

                                   is used when the optical emission results from the application of electric field.

A. radiation
B. efficiency
C. electro-luminescence
D. magnetron oscillator
Answer» C. electro-luminescence
Explanation: electro-luminescence is encouraged by selecting an appropriate semiconductor material. direct band-gap semiconductors are used for this purpose. in band-to-band recombination, the energy is released with the creation of photon. this emission of light is known as electroluminescence.
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