1. Estimate the external power efficiency of a GaAs planar LED when the transmission factor of the...
Question:
1. Estimate the external power efficiency of a GaAs planar LED when the transmission factor of the GaAs air interface is 0.7 and the internally generated optical power is 30% of the electric power supplied. The refractive index of GaAs may be taken as 3.6.
2. A GaAs planar LED emitting at a wavelength of 0.85 um has an internal quantum efficiency of 65% when passing a forward current of 20 mA/s. Estimate the optical power emitted by the device into air, and hence determine the external power efficiency if the potential difference across the device is 1 V. It may be assumed that the transmission factor at the GaAs air interface is 0.7 and that the refractive index of GaAs is 3.6.
Principles of heat transfer
ISBN: 978-0495667704
7th Edition
Authors: Frank Kreith, Raj M. Manglik, Mark S. Bohn