Large enhancement of light-extraction efficiency from optically pumped, nanorod light-emitting diodes

Mei Ling Kuo, Ya Ju Lee, Thomas C. Shen, Shawn Yu Lin

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We report a threefold enhancement of light-emission intensity at λ=460nm and a 16-fold extractionefficiency enhancement measured from a 2D array of nanorod LEDs. The nano-LEDs are randomly arranged and have a typical rod diameter of 100-250 nm. From a combination of photoluminescence, reflectance, and excitation power-dependence measurements, we show that the enhanced emission is due mainly to modification of the extraction efficiency, and not to that of the internal efficiency. Furthermore, we show that the extraction enhancement originates from the randomness of the 2D array that scatters light efficiently into the air and the smallness of the nanorods that eliminates the guiding modes that trap light.

Original languageEnglish
Pages (from-to)2078-2080
Number of pages3
JournalOptics Letters
Volume34
Issue number13
DOIs
Publication statusPublished - 2009 Jul 1

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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