Dresden 2009 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 35: Semiconductor Laser

HL 35.5: Vortrag

Mittwoch, 25. März 2009, 15:00–15:15, BEY 154

Electrically pumped organic Microcavity-GaN-Hybrid System — •Robert Brückner, Maik Langner, Daniel Kasemann, Hartmut Fröb, Vadim Lyssenko, and Karl Leo — Institut für Angewandte Photophysik, Technische Universität Dresden, 01062 Dresden, Germany

We investigate a monolithic hybrid system as a step towards a small-scale electrically pumped organic solid state laser. A hybrid inorganic-organic emitting system is realized by depositing a high finesse Microcavity (MC) (21 layer DBR of TiO₂ and SiO₂, λ/2-layer of ALQ₃:DCM) directly on the surface of a UV-LED-Chip (CREE-XL7090). The monolithic system is characterized by negligible losses of the excitation light since no optics are involved. We obtain a high transmission from the GaN-Chip (GaN, n=2,5) to the first mirror layer (TiO₂, n=2,1). An additional DBR on the top of the MC reflects the excitation wavelength of the UV-LED (400nm), and hence the intensity of the pump light in the cavity increases. The LED is driven in pulsed mode operation (pulse duration 20ns @ 2kHz, maximum pulse current 80A) to measure the optical properties of the VCSEL device. We present first results of this hybrid system including emission at the cavity wavelength and Input-Output-characteristics.