McqMate
| Q. |
As compared to planar LED structure, Dome LEDs have External power efficiency effective emission area and radiance. |
| A. | greater, lesser, reduced |
| B. | higher, greater, reduced |
| C. | higher, lesser, increased |
| D. | greater, greater, increased |
| Answer» B. higher, greater, reduced | |
| Explanation: in dome leds, the diameter of dome is selected so as to maximum the internal emission reaching surface within critical angle of gaas. thus, dome leds have high external power efficiency. the geometry of dome leds is such that dome is much larger than active recombination area, so it has greater emission era and reduced of radiance. | |
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