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Energy Express

Energy Express

  • Editor: Bernard Kippelen
  • Vol. 20, Iss. S2 — Mar. 12, 2012
  • pp: A333–A339

Nonradiative energy transfer between colloidal quantum dot-phosphors and nanopillar nitride LEDs

Fan Zhang, Jie Liu, Guanjun You, Chunfeng Zhang, Suzanne E. Mohney, Min Joo Park, Joon Seop Kwak, Yongqiang Wang, Daniel D. Koleske, and Jian Xu  »View Author Affiliations


Optics Express, Vol. 20, Issue S2, pp. A333-A339 (2012)
http://dx.doi.org/10.1364/OE.20.00A333


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Abstract

We present in this communication our study of the nonradiative energy transfer between colloidal quantum dot (QD) phosphors and nitride nanopillar light emitting diodes (LEDs). An epitaxial p-i-n InGaN/GaN multiple quantum-well (QW) heterostructure was patterned and dry-etched to form dense arrays of nanopillars using a novel etch mask consisting of self-assembled In3Sn clusters. Colloidal QD phosphors have been deposited into the gaps between the nanopillars, leading to sidewall coupling between the QDs and InGaN QW emitters. In this approach, close QW-QD contact and a low-resistance design of the LED contact layer were achieved simultaneously. Strong non-radiative energy transfer was observed from the InGaN QW to the colloidal QD phosphors, which led to a 263% enhancement in effective internal quantum efficiency for the QDs incorporated in the nanopillar LEDs, as compared to those deposited over planar LED structures. Time-resolved photoluminescence was used to characterize the energy transfer process between the QW and QDs. The measured rate of non-radiative QD-QW energy-transfer agrees well with the value calculated from the quantum efficiency data for the QDs in the nanopillar LED.

© 2012 OSA

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(260.2160) Physical optics : Energy transfer
(250.5590) Optoelectronics : Quantum-well, -wire and -dot devices

ToC Category:
Light-Emitting Diodes

History
Original Manuscript: August 31, 2011
Revised Manuscript: December 16, 2011
Manuscript Accepted: January 6, 2012
Published: March 9, 2012

Virtual Issues
Vol. 7, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Fan Zhang, Jie Liu, Guanjun You, Chunfeng Zhang, Suzanne E. Mohney, Min Joo Park, Joon Seop Kwak, Yongqiang Wang, Daniel D. Koleske, and Jian Xu, "Nonradiative energy transfer between colloidal quantum dot-phosphors and nanopillar nitride LEDs," Opt. Express 20, A333-A339 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-S2-A333


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