Garnet-Type Nanophosphors for White LED Lighting
Résumé
9 In this article we present a short review of the main wet chemical methods developed for the preparation 10 of Ce 3+-doped Y3Al5O12 (YAG:Ce) nanocrystals for their use as nanophosphors in LED lighting 11 technology : combustion, co-precipitation, sol-gel, modified-Péchini and solvothermal routes. We 12 highlight the key synthesis steps and discuss them in the view of the size, crystal quality and 13 agglomeration state of the obtained nanocrystals. The photoluminescence internal quantum yield of 14 these nanocrystals is also discussed in light of their morphology. In addition, we report on other garnet-15 type nanophosphors (Gd3Sc2Al3O12, (Gd,Y)3Al5O12, etc) doped with lanthanide ions (Ce 3+ , but also 16 Eu 3+ or Dy 3+) developed with the goal of obtaining a warmer white light. The spectroscopic properties 17 of these nanophosphors, in particular their emission range, is discussed in relation with the doping 18 nature, doping concentration and crystal field of the host matrices. 19 20 21
Domaines
Matériaux
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