Applied Physics Letters (2011)

Rare earth doped core-shell particles as phosphor for warm-white light-emitting diodes
Katleen Korthout, Philippe F. Smet, Dirk Poelman
Applied Physics Letters 98 (2011) 261919

Light-emitting diodes (LEDs) are efficient, energy-saving light sources. Unfortunately, designing phosphors for LEDs that emit warm white light is not straightforward. We solvothermally prepared rare earth doped alkaline earth sulfides with a core-shell structure in order to obtain a physical separation between different dopants (europium and cerium). Cathodoluminescence of a single phosphor particle in an electron microscope proves simultaneous Eu2+ and Ce3+ broad band emission. The emission color can be tuned by variation of the composition, core size and shell thickness. Upon excitation of SrS:Eu2+-SrS:Ce3+ core-shell structures at 430nm, white light emission with good color rendering and a color temperature around 3000K is obtained.


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