Q.

The amount of radiance in planer type of LED structures is                          

A. low
B. high
C. zero
D. negligible
Answer» A. low
Explanation: planer leds are fabricated using liquid or vapor phase epitaxial processes. here p-type is diffused into n-type substrate which creates junction. forward current flow through junction provides lambertian spontaneous emission. thus, device emits light from all surfaces. however a limited amount of light escapes the structure due to total internal reflection thus providing low radiance.
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