Research Focus. Fachhochschule Münster University of Applied Sciences. Department of Chemical Engineering. Inorganic Chemistry and Materials Sciences

Transcription

1 Research Focus Fachhochschule Münster University of Applied Sciences Allocation in "Optical Technologies" (pages 2, 3) Luminescence of / in: Free Standing Luminescent Nanoparticles (example page 4) Organomorphous Matrices (Hybrids and composites, pages 5-7) Crystalline Inorganic Matrices (pages 8-10) Department of Chemical Engineering Inorganic Chemistry and Materials Sciences Stegerwaldstr Steinfurt Germany Amorpohous Inorganic Matrices (pages 11, 12) Mesoscopic Inorganic Matrices (pages 13, 14) Related (Luminescent) Subjects (page 15) Prof. Dr. Ulrich Kynast 1

2 Optical UAS Münster / Kynast Research topics group Prof. Kynast Optically functional nano-, meso- and microporous systems (zeolites, sol-gel-materials, photonic crystals, polymers) Functionalisation of optically active nanoparticles (surfaces, core-shell-particles, redispersability) Optically Functional Materials for applications in... transparent polymer composites (Fibre Amplifiers & Lasers, Safety Marking, OLEDs*)... luminescent bio-labels... lighting (phosphors, e.g. for blue and UV-LEDs)... AC electroluminescence** through Chemistry... ultimately: laser materials ("ceramic laser", "microlaser") 2 * Organic Light Emitting Diodes ** Alternating Current Electroluminescence

3 Optical UAS Münster / Appl. Materials Science Luminescent species Host materials / matrices Applications Luminescent Markers Ln 3+ Ln 3+ nanoparticles Classical Solid State Lamps / Lighting Zeolites in for Biosensors Ln 3+ Sol-Gel Materials organic / inorganic ligands Lumineszenz-Marker Inverse Opals Laser Ln 3+ complexes Polymers LED OLED > 5 years > 2 years recent evaluation 3 Cooperations with Prof. Bredol, Prof. Jüstel

4 Free Standing Luminescent Nanoparticles, e.g.: Rare Earth Fluorides < 50 nm Core-shell Fluoride Nanoparticles of the Rare Earths M. Lezhnina, T. Jüstel, H. Kätker, D.U. Wiechert, U. H. Kynast, "Efficient luminescence from rare earth fluoride nanoparticles with optically functional shells", Adv. Funct. Mater., 16 (2006) 935 4

5 Organomorphous Matrices: Rare Earth Complexes in Polymers Polymer Imbeddings of Complexes of Rare Earths under UV-Irradiation ("Black Light") U. Kynast, Paso GmbH, "Synthesis of polymers for luminescence effects (Darstellung von Polymeren zur Erzeugung von Lumineszenzeffekten)", EP Appl , 2002 M.M. Lezhnina, Heike Kätker, Ulrich H. Kynast "Rare earth ions in porous matrices", Physics of the Solid State, 47 (2005) 1423 T. Fiedler, M. Hilder, P.C. Junk; U.H. Kynast, M.M. Lezhnina, M. Warzala,"Synthesis, structural and spectroscopic studies on the lanthanoid paraaminobenzoates and derived optically functional polyurethane composites", Eur.J. Inorg. Chem., 2007, M. Hilder, P.C. Junk, M.M. Lezhnina, M. Warzala, U.H. Kynast, "Rare Earth Functionalized Polymers", J. Alloys Comp. (2007), in press 5 e.g. [Tb(sal) 3 (H 2 O) 3 ]. 3H 2 O linked to PU backbone

6 Organomorphous Matrices: Rare Earth Species in Polymers Polymer Imbedding of Nanoparticles and Complexes of Rare Earths in (PMMA-) Microspheres... for Bio-mimetic Functions and Immuno - Assays ca nm PMMA microsphesres with Tb complex ( [(F 3 CCOCHCOCF 3 ) 3 Tb(H 3 CO(CH2) 2 O(CH2) 2 OCH 3 )], "(hfa) 3 Tb(diglyme)") 6

7 Organomorphous Matrices: Nanoparticles in Polymer Hybrids Nanophosphor-Polymer-Composite-Laser? Upconversion? Fibre amplification? 1

8 Crystalline Inorganic Matrices: Zeolites - VUV, UV, VIS, NIR Emitters Rare Earth ions in zeolite X 3. Rare Earth tungstate in sodalite 1. U. Kynast und V. Weiler, "Efficient luminescence from zeolites", Adv. Mater. 6 (1994) 937; T. Jüstel, D. U. Wiechert, C. Lau, D. Sendor, U. Kynast, "Optically functional zeolites: evaluation of UV and VUV stimulated photoluminescent properties of Ce 3+ and Tb 3+ doped zeolite X", Adv. Funct. Mater., 11 (2001) C. Lau, H.-J. Mai, U. Kynast, "Incorporation of Tungsten trioxide into faujasites and sodalites by solid state reaction", Micropor. Mesopor. Mater., 47 (2001) 339; C. Borgmann, J. Sauer, T. Jüstel, U. Kynast, F. Schüth, "Efficiently emitting Rare Earth sodalites by phase transformation of zeolite X and by direct synthesis", Adv. Mater., 11 (1999) 45 Metallo-organic complex in Faujasite Supercage 3. D. Sendor, U. Kynast, " Efficiently red emitting hybrid materials based on zeolites", Adv. Mater., 14 (2002) 1570; D. Sendor, U. Kynast, "Luminescence of Rare Earth metallo-organic complexes", Part 4, Chapter 5, in Host-Guest Systems Based on Nanoporous Crystals, Eds. F. Laeri, F. Schüth, U. Simon, M. Wark, Wiley-VCH, Weinheim, ISBN (2003) 8

9 Crystalline Inorganic Matrices: Sodalites - Upconversion and NIR Emission M. Lezhnina, F. Laeri, L. Benmouhadi, U.Kynast, "Efficient NIR emission from sodalite derivatives", Adv. Mater. 18 (2006) 280 M. Lezhnina, U. Kynast Luminescence from tungstate functionalized sodalites involving NIR states, J. Alloys Comp., 380 (2004)

10 Crystalline Inorganic Matrices: Rare Earth Nanofluorides in Zeolites 1nm Particle size > 50nm Rare Earth Nanoparticles in and from Zeolites M. Lezhnina, H. Kätker, U. Kynast, "Potential of nano-sized Rare Earth Fluorides in Optical Applications", invited lecture, Fall Meeting of the European Materials Research Society, Warsaw, Poland, 2004 M.M. Lezhnina, Heike Kätker, Ulrich H. Kynast "Rare earth ions in porous matrices", Physics of the Solid State, 47 (2005) 1423 U. Kynast, M. Lezhnina, H. Kätker, "Potential of nano-sized rare earth fluorides in optical applications", J. Solid State Phen., 106 (2005) 93 10

11 Amorphous Inorganic Matrices: Nanofluorides in Sol-Gel-Matrix EuOF nanoparticle in xerogel Rare Earth(oxi)fluoride nanoparticles in and from SiO 2 -based Sol-Gel-Materials M.M. Lezhnina, Heike Kätker, Ulrich H. Kynast "Rare earth ions in porous matrices", Physics of the Solid State, 47 (2005) 1423 U. Kynast, M. Lezhnina, H. Kätker, "Potential of nano-sized rare earth fluorides in optical applications", J. Solid State Phen., 106 (2005) 93 11

12 Amorphous Inorganic Matrices: Nanofluorides in Sol-Gel-Matrix Rare Earth(oxi)fluoride nanoparticles in and from SiO 2 -based Sol-Gel-Materialis molecular 5 nm 10 nm > 20 nm T 300 C t, T T > 500 C Low temperatures (<200 C) Complexes Low temperatures high heating rates Fluorides Higher temperatures, low heating rates Oxifluorides High temperatures, prolonged heating Oxides 12

13 Mesoscopic Inorganic Matrices: Luminescence in Photonic Crystals Loading with Lanthanoid- -complexes -nanoparticles Opal h ν (inverted) photonic structures Rel. Excitation Intensity Wavelength, nm Rel. norm. Emission Intensity Euuropium (oxi)fluoride nanoparticles in inverted opal M. M. Lezhnina, U. H. Kynast, "Inverse Opals Hosting Rare Earth Species", accepted for publication, J. Alloys Comp. (2007) 13

14 Mesoscopic Inorganic Matrices: Luminescence in Photonic Crystals + TEMOS: Gasphase: 14

15 Related Subjects: * nano-yag:ce in white emitting pcleds (phosphor converted LEDs) - BMB+F (OSRAM) * Utilization of metallo-organic Rare Earth complexes in bioassays - AIF / BMB+F (FH 3 ) * AC-electroluminescent layers - coop. w. SAINT-GOBAIN * Thermal behaviour of near UV stimulated phosphors - coop. w. Schott AG * Optically active nanoparticle - polymer composites in EL-Devices - coop. w. Degussa AG 15