Journal of Electroceramics

, Volume 33, Issue 1–2, pp 2–6 | Cite as

Enhanced color-conversion efficiency between colloidal quantum dot-phosphors and nitride LEDs by using nano-patterned p-GaN

  • Min Joo Park
  • Kyoung Jin Choi
  • Joon Seop Kwak


We have demonstrated that color-conversion efficiency can be enhanced through the use of non-radiative energy transfer between CdSe/ZnS core/shell colloidal quantum dots(QDs) and nitride multi-quantum well(MQW) in light emitting diodes(LEDs) having nano-patterned p-GaN. The nitride LEDs having nano-patterned p-GaN were fabricated by selective deep etching of p-GaN by using self-assembled ITO nano-dots as a etch mask. For comparison, we also fabricated the nitride LEDs having groove-etched p-GaN as well as the LEDs having a normal p-GaN layer. The results show that the LEDs having nano-patterned p-GaN showed the higher color conversion efficiency of 15.5 % and the improved effective internal quantum efficiency of 71 %. The enhanced efficiency can be attributed to sufficient close QD-MQW separation due to deep etching of p-GaN by using nano-patterning, which resulted in faster energy transfer rate of 2.47 ns−1 for non-radiative QD-MQW energy-transfer.


Light emitting diode Color-conversion efficiency Nano-patterning 



This work was supported in part by the Industrial Technology Development Program funded by the Ministry of Knowledge Economy (MKE, Korea), by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2011–0017325), and by BK21 PLUS at SCNU.


  1. 1.
    V.L. Colvin, M.C. Schlamp, A.P. Alivisatos, Light-emitting diodes made from cadmium selenide nanocrystals and a semiconducting polymer. Nature 370, 354 (1994)Google Scholar
  2. 2.
    S. Coe, W.K. Woo, M. Bawendi, V. Bulovic, Electroluminescence from single monolayers of nanocrystals in molecular organic devices. Nature 420, 800 (2002)Google Scholar
  3. 3.
    J.M. Caruge, J.E. Halpert, V. Wood, V. Bulovic, M.G. Bawendi, Colloidal quantum-dot light-emitting diodes with metal-oxide charge transport layers. Nat. Photonics 2, 247 (2008)Google Scholar
  4. 4.
    S.V. Kershaw, M. Harrison, A.L. Rogach, A. Kornowski, Development of IR-emitting colloidal II-VI quantum-dot materials. IEEE Quant. Electron. 6, 534 (2000)Google Scholar
  5. 5.
    S.C. Sullivan, W.-K. Woo, J.S. Steckel, M. Bawendi, V. Bulovi, Tuning the performance of hybrid organic/inorganic quantum dot light-emitting devices. Org. Electron. 4, 123 (2003)Google Scholar
  6. 6.
    J. Hill, S.Y. Heriot, O. Worsfold, T.H. Richardson, A.M. Fox, D.D.C. Bradley, Controlled Förster energy transfer in emissive polymer Langmuir-Blodgett structures. Phys. Rev. B 69, 041303 (2004)Google Scholar
  7. 7.
    Q. Sun, Y.A. Wang, S.L. Lin, D. Wang, T. Zhu, J. Xu, C. Yang, Y. Li, Bright, multicoloured light-emitting diodes based on quantum dots. Nat. Photonics 1, 717 (2007)CrossRefGoogle Scholar
  8. 8.
    M. Achermann, M.A. Petruska, S. Kos, D.L. Smith, D.D. Koleske, V.I. Klimov, Energy-transfer pumping of semiconductor nanocrystals using an epitaxial quantum well. Nature 429, 642 (2004)CrossRefGoogle Scholar
  9. 9.
    T. Förster, Zwischenmolekulare Energiewanderung und Fluoreszenz. Ann. Phys. 437, 55 (1948)CrossRefGoogle Scholar
  10. 10.
    M. Achermann, M.A. Petruska, D.D. Koleske, M.H. Crawford, V.I. Klimov, Nanocrystal-based light-emitting diodes utilizing high-efficiency nonradiative energy transfer for color conversion. Nano Lett. 6, 1396 (2006)CrossRefGoogle Scholar
  11. 11.
    S. Nizamoglu, E. Sari, J.H. Baek, I.H. Lee, H.V. Demir, White light generation by resonant nonradiative energy transfer from epitaxial InGaN/GaN quantum wells to colloidal CdSe/ZnS core/shell quantum dots. New J. Phys. 10, 123001 (2008)CrossRefGoogle Scholar
  12. 12.
    S. Chanyawadee, P.G. Lagoudakis, R.T. Harley, M.D.B. Charlton, D.V. Talapin, H.W. Huang, C.H. Lin, Increased color-conversion efficiency in hybrid light-emitting diodes utilizing non-radiative energy transfer. Adv. Mater. 22, 602 (2010)CrossRefGoogle Scholar
  13. 13.
    M.J. Park, J.S. Kwak, InGaN-based nano-pillar light emitting diodes fabricated by self-assembled ITO nano-dots. J. Nanosci. Nanotechnol. 12, 4265 (2012)CrossRefGoogle Scholar
  14. 14.
    F. Zhang, J. Liu, G. You, C. Zhang, S.E. Mohney, M.J. Park, J.S. Kwak, Y. Wang, D.D. Koleske, J. Xu, Nonradiative energy transfer between colloidal quantum dot-phosphors and nanopillar nitride LEDs. Opt. Express 20, A333 (2012)CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Min Joo Park
    • 1
  • Kyoung Jin Choi
    • 2
  • Joon Seop Kwak
    • 1
  1. 1.Department of Printed Electronics EngineeringSunchon National UniversityJeonnamSouth Korea
  2. 2.School of Mechanical and Advanced Materials EngineeringUlsan National Institute of Science & Technology (UNIST)UlsanSouth Korea

Personalised recommendations