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Defect-reduced green GaInN/GaN light-emitting diode on nanopatterned sapphire
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/content/aip/journal/apl/98/15/10.1063/1.3579255
2011-04-11
2015-04-21

Abstract

Green GaInN/GaN quantum welllight-emitting diode(LED) wafers were grown on nanopatterned -plane sapphire substrate by metal-organic vapor phase epitaxy. Without roughening the chip surface, such LEDs show triple the light output over structures on planar sapphire. By quantitative analysis the enhancement was attributed to both, enhanced generation efficiency and extraction. The spectral interference and emission patterns reveal a 58% enhanced light extraction while photoluminescence reveals a doubling of the internal quantum efficiency. The latter was attributed to a 44% lower threading dislocation density as observed in transmission electron microscopy. The partial light output power measured from the sapphire side of the unencapsulated nanopatterned substrate LED die reaches 5.2 mW at 525 nm at 100 mA compared to 1.8 mW in the reference LED.

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Scitation: Defect-reduced green GaInN/GaN light-emitting diode on nanopatterned sapphire
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/15/10.1063/1.3579255
10.1063/1.3579255
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