Temperature characteristics of the red Resonant Cavity light emitting diodes

Abstract

In this paper, InGaP/AlGaInP 640nm Resonant-Cavity light-emitting diodes (RCLEDs) with stable temperature characteristics have been achieved and compared them with 630nm InGaP/AlGaInP red light-emitting diodes which don't include the top and bottom DBRs. We mainly focus on the temperature characteristics of these two kinds of devices as operation temperature increasing. When the operation temperature increases from 10□ to 47.5□, the optical and electrical characteristics variations of RCLEDs at 20mA is changed more subtly. The red shift of RCLEDs is 2nm, while the red LEDs' is 4nm. The light efficiency degrades less severely. According to the experimental results, we confirm that the temperature characteristics of RCLEDs are more insensitive. In order to interpret the temperature dependent experimental results, theoretical analysis is further carried to investigate the physical mechanism.