Berlin 2018 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 50: HL Poster IV
HL 50.44: Poster
Thursday, March 15, 2018, 19:00–21:00, Poster B
Optical properties of carbon nanodots as active material in planar microcavities — •Lukas Trefflich1, Frank Dissinger2, Mizuki Kakei1, 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 present electronic and optical properties as well as temporal dynamics of carbon nanodots (C-dots) in different solvents and transparent matrices. We found bright light emission in the visible spectral range and decay time constants in the order of 10 nanoseconds. Both properties depend on the dilution of the solvents or the material of the host matrix, leading to differing emission wavelengths and decay times. This enables to tune the optical properties of carbon nanodots. We explore their application as active material in planar microcavities for possible laser and white LED application. White light LEDs usually contain rare-earth elements [1], which are rare 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