Nanocrystalline Y3Al5O12:Ce phosphor-based white light-emitting diodes embedded with CdS:Mn/ZnS core/shell quantum dots

120 nm-sized yellow emitting Y3Al5O12:Ce (YAG:Ce) nanocrystalline phosphors and 4.5 nm-sized orange emitting CdS:Mn/ZnS core/shell structured quantum dots (QDs) were prepared by a modified polyol and a reverse micelle chemistry, respectively. To compensate a poor color rendering index (CRI) of YAG:Ce nanophosphor-based white light-emitting diodes (LEDs) due to the lack of red spectral component, CdS:Mn/ ZnS QDs were blended into YAG:Ce nanophosphors. Blends of nanophosphors and QDs exhibited the prominent spectral evolution with an increasing content of QDs. A hybrid white LED, which combines a blue LED with the blend of nanophosphor and QDs with a weight ratio of 1:1 was demonstrated with an improved CRI value of 85. (C) 2008 Elsevier B.V. All rights reserved.