Sustained high external quantum efficiency in ultrasmall blue III-nitride micro-LEDs

David Hwang, Asad Mughal, Christopher D. Pynn, Shuji Nakamura, Steven P. DenBaars

Research output: Contribution to journalArticlepeer-review

132 Scopus citations

Abstract

Ultrasmall blue InGaN micro-light-emitting diodes (μLEDs) with areas from 10-4 to 0.01 mm2 were fabricated to study their optical and electrical properties. The peak external quantum efficiencies (EQEs) of the smallest and largest μLEDs were 40.2 and 48.6%, respectively. The difference in EQE was from nonradiative recombination originating from etching damage. This decrease is less severe than that in red AlInGaP LEDs. The efficiency droop at 900 A/cm2 of the smallest μLED was 45.7%, compared with 56.0% for the largest, and was lower because of improved current spreading. These results show that ultrasmall μLEDs may be fabricated without a significant loss in optical or electrical performance.
Original languageEnglish (US)
Pages (from-to)032101
JournalApplied Physics Express
Volume10
Issue number3
DOIs
StatePublished - Feb 1 2017
Externally publishedYes

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