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HL: Fachverband Halbleiterphysik
HL 12: HL Poster I
HL 12.33: Poster
Monday, April 1, 2019, 17:30–20:00, Poster E
Fabrication and properties of carbon-nanodot-based planar microcavities — •Lukas Trefflich1, Frank Dissinger2, Chris Sturm1, Siegfried R. Waldvogel2, Marius Grundmann1, and Rüdiger Schmidt-Grund1 — 1Felix-Bloch-Institute for Solid State Physics, Universität Leipzig, 04103 Leipzig — 2Institute for Organic Chemistry, Johannes Gutenberg Universität Mainz, 55128 Mainz
We report about the growth and structural as well as optical properties of carbon-nanodot-based planar microcavities. The carbon nanodots made from citric acid emit bright light in the spectral range between 450 nm and 500 nm. By incorporating them in a microcavity and varying the cavitylayer thickness, it is possible to tune the emission wavelength of the device. We present the angularly and temporally resolved emission characteristic of the microcavity, as well as the dielectric function of the carbon-nanodot-containing cavity layer from the NIR to the UV spectral range. Furthermore, we explore their usage for possible laser and white light LEDs. White light LEDs usually contain rare-earth elements [1], which are less abundant and expensive. Carbon nanodots can be synthesized from environment-friendly substances like coffee, tea, grass and candle soot. [2] They are biocompatible [3] and photo-stable [4] and therefore promising alternatives for conventional LED designs. [1] H. Höppe, Angew. Chem., Int. Ed. 2009, 48 [2] Roy et al., Mater. Today, 2015, 18 [3] da Silva et al., Trends Anal. Chem., 2011, 30 [4] Sun et al., J. Am. Chem. Soc., 2006, 128