Phosphor-Free Apple-White LEDs with Embedded Indium-Rich Nanostructures Grown on Strain Relaxed Nano-epitaxy GaN

Content Provider	Semantic Scholar
Author	Soh, C. B. Liu, Wei Chua, S. J. Chow, Sy Miin Tripathy, Sudhiranjan Tan, Rjn
Copyright Year	2010
Abstract	Phosphor-free apple-white light emitting diodes have been fabricated using a dual stacked InGaN/GaN multiple quantum wells comprising of a lower set of long wavelength emitting indium-rich nanostructures incorporated in multiple quantum wells with an upper set of cyan-green emitting multiple quantum wells. The light-emitting diodes were grown on nano-epitaxially lateral overgrown GaN template formed by regrowth of GaN over SiO(2) film patterned with an anodic aluminum oxide mask with holes of 125 nm diameter and a period of 250 nm. The growth of InGaN/GaN multiple quantum wells on these stress relaxed low defect density templates improves the internal quantum efficiency by 15% for the cyan-green multiple quantum wells. Higher emission intensity with redshift in the PL peak emission wavelength is obtained for the indium-rich nanostructures incorporated in multiple quantum wells. The quantum wells grown on the nano-epitaxially lateral overgrown GaN has a weaker piezoelectric field and hence shows a minimal peak shift with application of higher injection current. An enhancement of external quantum efficiency is achieved for the apple-white light emitting diodes grown on the nano-epitaxially lateral overgrown GaN template based on the light -output power measurement. The improvement in light extraction efficiency, η(extraction,) was found to be 34% for the cyan-green emission peak and 15% from the broad long wavelength emission with optimized lattice period.
Starting Page	1788
Ending Page	1794
Page Count	7
File Format	PDF HTM / HTML
PubMed reference number	21124627v1
Volume Number	5
Journal	Nanoscale research letters
Alternate Webpage(s)	https://nanoscalereslett.springeropen.com/track/pdf/10.1007/s11671-010-9712-0?site=nanoscalereslett.springeropen.com
Language	English
Access Restriction	Open
Subject Keyword	Aluminum Oxide Clinical Use Template Diameter (qualifier value) Dislocations Dual Embedding Indium Indocyanine Green Interface Device Component Nano Nanostructured Materials Relaxation Water Wells gallium nitrate wavelength
Content Type	Text
Resource Type	Article