Tunable white emission of silver-sulfur-zeolites as single-phase LED phosphors

Wouter Baekelant, Giacomo Romolini, Li Sun, Michiel De Ras, Eduard Fron, Tiago Moreira, Catarina Viola, Andreia Ruivo, César A. T. Laia, Johan Martens, Cristina Martin, Cheol Woong Kim, Mark Van Der Auweraer, Maarten B. J. Roeffaers, Johan Hofkens, Eduardo Coutino-Gonzalez

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Metal clusters confined inside zeolite materials display remarkable luminescent properties, making them very suitable as potential alternative phosphors in white LED applications. However, up to date, only single-color emitters have been reported for luminescent metal-exchanged zeolites. In this study, we synthesized and characterized white emitting silver-sulfur zeolites, which show a remarkable color tunability upon the incorporation of silver species in highly luminescent sulfur-zeolites. Via a combined steady-state and time-resolved photoluminescence spectroscopy characterization, we suggest that the observed luminescence and tunability arise from the presence of two different species. The first associated to an orange-red emitting silver cluster (Ag-CL), whereas the second is related to a blue-white emitting S-Ag-species. The relative contribution of both luminescent species depends on the synthesis procedure. It was shown that the formation of the blue-white emitting S-Ag-species is favored upon a heat-treatment of the samples.

Original languageEnglish
Article number024004
JournalMethods and Applications in Fluorescence
Volume8
Issue number2
DOIs
Publication statusPublished - 2020

Keywords

  • LED
  • metal cluster
  • self-assembly
  • white-emitting phosphors
  • zeolites

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