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The development of a novel composite phosphor converter based on singlecrystalline films of Tb 3 Al 5 O 12 :Ce garnet and Y 3 Al 5 O 12 :Ce single-crystal substrate is reported. The liquid phase epitaxy growth method is chosen for the fabrication of the Tb 3 Al 5 O 12 :Ce/Y 3 Al 5 O 12 :Ce epitaxial structures with excellent photoconversion properties for application in white light-emitting diodes (LEDs). The influence of Ce 3þ concentration and thickness of Y 3 Al 5 O 12 :Ce substrate as well as the thickness of Tb 3 Al 5 O 12 :Ce films on the photoconversion properties is investigated for the construction of warm white LEDs prototypes based on the developed composite phosphor converters.

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