In this work, powders of nanostructured porous silicon (NPSp) with strong and broad photoluminescence in the red portion of the spectrum are used as non-toxic phosphors for effectively tuning the color of commercial blue- LEDs from blue to violet, magenta, and red via wavelength conversion. NPSp/polydimethylsiloxane (PDMS) composites consisting of PDMS encapsulating different concentrations of red-emitting NPSp obtained by electro- chemical etching of silicon are prepared and spotted on top of commercial blue-LEDs. Good reliability of the tun- ing process, in terms of NPSp fabrication and concentration, and excellent stability of the tuning color, in terms of LED biasing, are demonstrated by electrical/optical characterization of several NPSp-modified commercial LEDs.
PHOSPHORLESS COLOR TUNING OF LIGHT-EMITTING-DIODES BY RED- EMITTING NANOSTRUCTURED POROUS SILICON POWDER
STRAMBINI, LUCANOS MARSILIO;BARILLARO, GIUSEPPE
2016-01-01
Abstract
In this work, powders of nanostructured porous silicon (NPSp) with strong and broad photoluminescence in the red portion of the spectrum are used as non-toxic phosphors for effectively tuning the color of commercial blue- LEDs from blue to violet, magenta, and red via wavelength conversion. NPSp/polydimethylsiloxane (PDMS) composites consisting of PDMS encapsulating different concentrations of red-emitting NPSp obtained by electro- chemical etching of silicon are prepared and spotted on top of commercial blue-LEDs. Good reliability of the tun- ing process, in terms of NPSp fabrication and concentration, and excellent stability of the tuning color, in terms of LED biasing, are demonstrated by electrical/optical characterization of several NPSp-modified commercial LEDs.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
