TY - CONF A1 - Würth, Christian T1 - Spektroskopie mit der Ulbrichtkugel: Streuende und floureszierende Systeme in der Bioanalytik T2 - PTB-Institutsseminar CY - Braunschweig, Germany DA - 2013-01-23 PY - 2013 AN - OPUS4-27806 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Würth, Christian A1 - Resch-Genger, Ute A1 - Behnke, Thomas A1 - Pauli, Jutta A1 - Hennig, Andreas A1 - Hoffmann, Angelika A1 - Hoffmann, Katrin A1 - Hatami, Soheil A1 - Spieles, Monika T1 - Functional Chromophores and Optical Spectroscopy in Bioanalysis T2 - PTB Braunschweig im FB 4.1 CY - Braunschweig, Germany DA - 2013-01-23 PY - 2013 AN - OPUS4-29234 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Würth, Christian A1 - Behnke, Thomas A1 - Pauli, Jutta A1 - Hennig, Andreas A1 - Hoffmann, Katrin A1 - Hoffmann, Angelika A1 - Hatami, Soheil A1 - Spieles, Monika A1 - Resch-Genger, Ute T1 - Functional Chromophores for Bioanalysis and Material Sciences Based on Molecular Fluorophores and Differently Sized Beads T2 - Institut für Mikrotechnik Mainz (IMM) CY - Mainz, Germany DA - 2013-02-19 PY - 2013 AN - OPUS4-29235 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Würth, Christian A1 - Resch-Genger, Ute T1 - Determination of Quantum Yiels and Efficiencies of Fluorescent Particles with an Integrating Sphere Setup T2 - MAF 13 CY - Genoa, Italy DA - 2013-09-08 PY - 2013 AN - OPUS4-29574 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Würth, Christian A1 - Grabolle, Markus A1 - Pauli, Jutta A1 - Spieles, Monika A1 - Resch-Genger, Ute T1 - Relative und absolute Messungen der Photolumineszenzquantenausbeute (?f) und erreichbare Unsicherheiten T2 - VDI-Fachtagung Messunsicherheit 2013 CY - Braunschweig, Germany DA - 2013-11-05 PY - 2013 AN - OPUS4-29575 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Würth, Christian A1 - Resch-Genger, Ute T1 - Luminescence characterization with an integrating sphere T2 - Chebana - Upcare Joint Seminar CY - Regensburg, Germany DA - 2012-08-30 PY - 2012 AN - OPUS4-27069 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Resch-Genger, Ute A1 - Würth, Christian A1 - Pauli, Jutta A1 - Weigert, Florian T1 - Quantitative optical-spectroscopic characterization of luminescent nanomaterials - Photoluminescence Quantum Yields N2 - Accurate and quantitative photoluminescence measurements are mandatory for the comparison of different emitter classes and the rational design of the next generation of molecular and nanoscale reporters as well as for most applications relying on their luminescence features in the life and material sciences and nanobiophotonics. In the following, procedures for the determination of the spectroscopic key parameter photoluminescence quantum yield, i.e., the number of emitted per absorbed photons, in the UV/vis/NIR/SWIR are presented including pitfalls and achievable uncertainties and material-specific effects related to certain emitter classes are addressed. Special emphasis is dedicated to luminescent nanocrystals. T2 - International Workshop on "Emerging Nanomaterials for Displays and SSL" CY - Dresden, Germany DA - 11.11.2021 KW - Nano KW - Nanomaterial KW - Nanocrystal KW - Semiconductor quantum dot KW - Lanthanide KW - Photoluminescence KW - Quantum yield KW - Photophysics KW - Lifetime KW - Surface chemistry KW - Brightness KW - NIR KW - SWIR KW - Method KW - Uncertainty KW - Rreference material PY - 2021 AN - OPUS4-53783 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Pauli, Jutta A1 - Würth, Christian A1 - Güttler, Arne A1 - Resch-Genger, Ute T1 - Reliable Determination of the Signal-Relevant Spectroscopic Key Characteristics of Luminescent Reporters and Optical Probes for Imaging in the vis/NIR/SWIR N2 - Introduction. Comparing different emitter classes and rationally designing the next generation of molecular and nanoscale probes for bioimaging applications require accurate and quantitative methods for the measurement of the key parameter photoluminescence quantum yield f.1 f equals the number of emitted per number of absorbed photons. This is particularly relevant for increasingly used fluorescence imaging in the short wave-infrared region (SWIR) ≥ 900 nm providing deeper penetration depths, a better image resolution, and an improved signal-to-noise or tumor-to-background ratio.2, 3 However, spectroscopic measurements in the SWIR are more challenging and require specific calibrations and standards. T2 - EMIM 2021 CY - Göttingen, Germany DA - 24.08.2021 KW - Fluorescence KW - Optical probe KW - Dye KW - Photophysics KW - Quantum yield KW - Mechanism KW - NIR KW - SWIR KW - Imaging KW - Reference material KW - Reliability KW - Nano KW - Particle KW - Method KW - Quality assurance PY - 2021 AN - OPUS4-53233 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Würth, Christian T1 - Relative and absolute determination of the quantum efficiency of transparent and scattering luminescent materials T2 - Institutsseminar Werkstoffwissenschaften Universität Erlangen CY - Erlangen, Germany DA - 2014-06-23 PY - 2014 AN - OPUS4-30919 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Würth, Christian A1 - Hatami, Soheil A1 - Kaiser, Martin A1 - Pauli, Jutta A1 - Resch-Genger, Ute T1 - Absolute fluorescence measurements > 1000 nm: setup design, calibration and standards N2 - Bright emitters with photoluminescence in the spectral region of 800 – 1600 nm are increasingly important as optical reporters for molecular imaging, sensing, and telecommunication and as active components in electrooptical and photovoltaic devices. Their rational design is directly linked to suitable methods for the characterization of their signal-relevant properties, especially their photoluminescence quantum yield. Aiming at the development of bright semiconductor nanocrystals with emission > 1000 nm, we designed a new NIR/IR integrating sphere setup for the wavelength region of 600 – 1600 nm. We assessed the performance of this setup by acquiring the corrected emission spectra and quantum yield of the organic dyes Itrybe, IR140, and IR26 and several infrared (IR)-emissive Cd1-xHgxTe and PbS semiconductor nanocrystals and comparing them to data obtained with two independently calibrated fluorescence instruments absolutely or relatively to previously evaluated reference dyes. Our results highlight special challenges of photoluminescence studies in the IR ranging from solvent absorption to the lack of spectral and intensity standards together with quantum dot-specific challenges like photobrightening and photodarkening and the size-dependent air stability and photostability of differently sized oleate-capped PbS colloids. These effects can be representative for lead chalcogenides. Moreover, we redetermined the quantum yield of IR26, the most frequently used IR reference dye, to 1.1×10-3 in 1,2-dichloroethane DCE with a thorough sample reabsorption and solvent absorption correction. T2 - SPIE CY - San Francisco, USA DA - 11.02.2016 KW - Ir KW - Quantum yield PY - 2016 AN - OPUS4-38405 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -