Metal–Organic Framework Luminescence in the Yellow Gap by Codoping of the Homoleptic Imidazolate ∞3[Ba(Im)2] with Divalent Europium - Research portal of Justus Liebig University Giessen:

Journal article

Metal–Organic Framework Luminescence in the Yellow Gap by Codoping of the Homoleptic Imidazolate ∞3[Ba(Im)2] with Divalent Europium

Authors list: Rybak, JC; Hailmann, M; Matthes, PR; Zurawski, A; Nitsch, J; Steffen, A; Heck, JG; Feldmann, C; Götzendörfer, S; Meinhardt, J; Sextl, G; Kohlmann, H; Sedlmaier, SJ; Schnick, W; Müller-Buschbaum, K

Publication year: 2013

Pages: 6896-6902

Journal: Journal of the American Chemical Society

Volume number: 135

Issue number: 18

ISSN: 0002-7863

DOI Link: https://doi.org/10.1021/ja3121718

Publisher: American Chemical Society

Abstract:
The rare case of a metal-triggered broad-band yellow emitter among inorganic–organic hybrid materials was achieved by in situ codoping of the novel imidazolate metal–organic framework ∞3[Ba(Im)2] with divalent europium. The emission maximum of this dense framework is in the center of the yellow gap of primary light-emitting diode phosphors. Up to 20% Eu2+ can be added to replace Ba2+ as connectivity centers without causing observable phase segregation. High-resolution energy-dispersive X-ray spectroscopy showed that incorporation of even 30% Eu2+ is possible on an atomic level, with 2–10% Eu2+ giving the peak quantum efficiency (QE = 0.32). The yellow emission can be triggered by two processes: direct excitation of Eu2+ and an antenna effect of the imidazolate linkers. The emission is fully europium-centered, involving 5d → 4f transitions, and depends on the imidazolate surroundings of the metal ions. The framework can be obtained by a solvent-free in situ approach starting from barium metal, europium metal, and a melt of imidazole in a redox reaction. Better homogeneity for the distribution of the luminescence centers was achieved by utilizing the hydrides BaH2 and EuH2 instead of the metals.

Authors/Editors

- Uni.-Prof. Dr. Klaus Müller-Buschbaum

Citation Styles

Harvard Citation style: Rybak, J., Hailmann, M., Matthes, P., Zurawski, A., Nitsch, J., Steffen, A., et al. (2013) Metal–Organic Framework Luminescence in the Yellow Gap by Codoping of the Homoleptic Imidazolate ∞3[Ba(Im)2] with Divalent Europium, Journal of the American Chemical Society, 135(18), pp. 6896-6902. https://doi.org/10.1021/ja3121718

APA Citation style: Rybak, J., Hailmann, M., Matthes, P., Zurawski, A., Nitsch, J., Steffen, A., Heck, J., Feldmann, C., Götzendörfer, S., Meinhardt, J., Sextl, G., Kohlmann, H., Sedlmaier, S., Schnick, W., & Müller-Buschbaum, K. (2013). Metal–Organic Framework Luminescence in the Yellow Gap by Codoping of the Homoleptic Imidazolate ∞3[Ba(Im)2] with Divalent Europium. Journal of the American Chemical Society. 135(18), 6896-6902. https://doi.org/10.1021/ja3121718