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Internal quantum efficiency (IQE) of InGaN-based ultraviolet light emitting diodes (LED) grown on patterned sapphire substrate (PSS) and flat sapphire were measured by photoluminescence and electroluminescence methods. The IQE improvement of PSS LED is significant.
The results of study of minority carrier lifetime in p-type and n-type InGaAs double heterostructures (DH) and thermophotovoltaic (TPV) cells with InPAs step-graded buffer layers grown on InP substrates are summarized. The active layer carrier concentration was varied in the range from 1015 to 1018 cm-3. The carrier lifetime constants were determined from photoluminescence (PL) transient and frequency...
Record external quantum efficiency (99%) is obtained for a GaAs/InGaP heterostructure bonded to a dome lens at 100 K. This was measured using a differential luminescence thermometry technique with temperature resolution ~ 30 muK.
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