Sr[Li2Al2O2N2]:Eu2+—A high performance red phosphor to brighten the future

Gregor J. Hoerder, Markus Seibald, Dominik Baumann, Thorsten Schröder, Simon Peschke, Philipp C. Schmid, Tobias Tyborski, Philipp Pust, Ion Stoll, Michael Bergler, Christian Patzig, Stephan Reißaus, Michael Krause, Lutz Berthold, Thomas Höche, Dirk Johrendt and Hubert Huppertz ()
Additional contact information
Gregor J. Hoerder: University of Innsbruck
Markus Seibald: OSRAM Opto Semiconductors GmbH
Dominik Baumann: OSRAM Opto Semiconductors GmbH
Thorsten Schröder: OSRAM Opto Semiconductors GmbH
Simon Peschke: OSRAM Opto Semiconductors GmbH
Philipp C. Schmid: OSRAM Opto Semiconductors GmbH
Tobias Tyborski: OSRAM Opto Semiconductors GmbH
Philipp Pust: OSRAM Opto Semiconductors GmbH
Ion Stoll: OSRAM Opto Semiconductors GmbH
Michael Bergler: OSRAM Opto Semiconductors GmbH
Christian Patzig: Fraunhofer Institute for Microstructure of Materials and Systems IMWS
Stephan Reißaus: Fraunhofer Institute for Microstructure of Materials and Systems IMWS
Michael Krause: Fraunhofer Institute for Microstructure of Materials and Systems IMWS
Lutz Berthold: Fraunhofer Institute for Microstructure of Materials and Systems IMWS
Thomas Höche: Fraunhofer Institute for Microstructure of Materials and Systems IMWS
Dirk Johrendt: Ludwig Maximilian University of Munich
Hubert Huppertz: University of Innsbruck

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract Innovative materials for phosphor converted white light-emitting diodes are in high demand owing to the huge potential of the light-emitting diode technology to reduce energy consumption worldwide. As the primary blue diode is already highly optimized, the conversion phosphors are of crucial importance for any further improvements. We report on the discovery of the high performance red phosphor Sr[Li2Al2O2N2]:Eu2+ meeting all requirements for a phosphor’s optical properties. It combines the optimal spectral position for a red phosphor, as defined in the 2016 Research & Development-plan of the United States government, with an exceptionally small spectral full width at half maximum and excellent thermal stability. A white mid-power phosphor-converted light-emitting diode prototype utilising Sr[Li2Al2O2N2]:Eu2+ shows an increase of 16% in luminous efficacy compared to currently available commercial high colour-rendering phosphor-converted light-emitting diodes, while retaining excellent high colour rendition. This phosphor enables a big leap in energy efficiency of white emitting phosphor-converted light-emitting-diodes.

Date: 2019
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DOI: 10.1038/s41467-019-09632-w

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