Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 26: Lasers and LEDs II
HL 26.3: Vortrag
Montag, 11. März 2013, 17:15–17:30, H16
Design, simulation and characterization of RCLEDs — •Paul Börner1, Michael Kunzer1, Thorsten Passow1, Klaus Köhler1, Wilfried Pletschen1, Tarik Moudakir2, Abdallah Ougazzaden2, Frédéric Genty3, and Joachim Wagner1 — 1Fraunhofer-Institut für Angewandte Festkörperphysik, Tullastrasse 72, D-79108 Freiburg, Germany — 2UMI 2958, Georgia Tech CNRS, Georgia Inst Technol, 2-3 Rue Marconi, F-57070 Metz, France — 3Supelec, 2 Rue Edouard Belin, F-57070 Metz, France
Resonant-cavity light emitting diodes (RCLEDs) can be regarded as a hybrid between vertical-cavity surface-emitting lasers (VCSELs) and conventional LEDs. In contrast to VCSELs, the operating principle is based on spontaneous emission. Putting a light source into a cavity enhances the probability of spontaneous emission (Purcell effect). Therefore, emission perpendicular to the surface is increased. On the one hand, RCLEDs are still incoherent light sources with larger line widths and no speckling compared to lasers since the mirror reflectivity and optical gain is too low for stimulated emission. On the other hand the resonant cavity improves emission directionality compared to conventional LEDs. In combination with circular facets fitting to the fibre core diameter, RCLEDs are suited for efficient fibre coupling.
We report on the realization of RCLEDs emitting in the 400 nm range. The vertical cavity consists of a top dielectric SiO2/ZrO2 mirror and a bottom AlInN/GaN or AlGaN/GaN distributed Bragg reflector (DBR) enclosing an InGaN/GaN multiple quantum well active layer.