Ce3+ and Eu3+ emissions in YAG via a core-shell strategy for warm white LED lighting

  • Mario Borlaf
  • Malgorzata Frankowska
  • Wladyslaw W. Kubiak
  • Thomas Graule
Brief Communication: Sol-gel and hybrid materials for optical, photonic and optoelectronic applications
  • 97 Downloads

Abstract

YAG:Ce and YAG:Eu sols were synthesized by a polymeric sol-gel route. The crystallization temperature of YAG was determined by X-ray diffraction as a function of the calcination temperature, revealing that YAG starts to crystallize directly from the amorphous phase at 800 °C. The effects of the thermal treatment and the dopant amount on the photoluminescent properties were studied, observing the highest emission after calcination at 1000 °C for 1 h in both cases and with a concentration of 1 and 3 mol% of Ce and Eu, respectively. Core-shell materials were prepared by dipping YAG:Ce or YAG:Eu sintered pellets into the synthesized sols and then, these materials were calcined at 1000 °C for 1 h. An effective energy transfer from Ce to Eu was observed in the sample YAG:Eu (core)–YAG:Ce (shell) when blue light (λ = 465 nm) is used as excitation source. This wavelength excites the Ce but not the Eu; however, in the photoluminescence emission spectrum, the bands associated to both ions can be clearly detected, confirming that the core-shell strategy is a good method for the preparation of warmer white LEDs.

Keywords

Yttrium aluminum garnet Cerium Europium Photoluminescence 

Notes

Acknowledgements

We acknowledge the funding provided by the Swiss National Science Foundation under project no. IZRPZO_164736/1. This work is a part of the 382-PiGnano project of ERA.Net RUS Plus 2013-2018 initiative under Consortium Agreement with ITMO University (Russia), Swiss Federal Laboratories for Materials Science and Technology (Switzerland), and Hamburg University of Technology (Germany).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Laboratory for High Performance Ceramics, EmpaDübendorfSwitzerland
  2. 2.AGH University of Science and TechnologyKrakowPoland

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