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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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