Electronic Materials Letters

, Volume 15, Issue 3, pp 363–367 | Cite as

Quantum Dot Light-Emitting Diodes Employing Phosphorescent Organic Molecules as Double Emission Layers

  • So Eun Ju
  • Jiwan KimEmail author
Original Article - Nanomaterials


This work presents hybrid quantum dot light-emitting diodes with double emission layers. Blue quantum dots were deposited by spin-coating for the first emission layer. Then, for the second emission layer, red phosphorescent organic molecules, Ir(piq)3, were deposited by thermal evaporation without host materials. These unique bichromatic devices showed two distinct electroluminescent (EL) peaks with similar intensities at 10 V; then, the variation of the EL spectra with applied voltage was investigated systematically. The findings of this study demonstrate the potential for white EL devices using fewer materials in the near future.

Graphical Abstract


Quantum dots QLEDs Phosphorescent organic molecules Hybrid structure 



This work was supported by Kyonggi University Research Grant 2016.


  1. 1.
    Colvin, V.L., Schlamp, M.C., Alivisatos, A.P.: Light-emitting diodes made from cadmium selenide nanocrystals and a semiconducting polymer. Nature 370, 354 (1994)CrossRefGoogle Scholar
  2. 2.
    Wood, V., Bulovic, V.: Colloidal quantum dot light-emitting devices. Nano Rev. 1, 5202 (2010)CrossRefGoogle Scholar
  3. 3.
    Dai, X., Zhang, Z., Jin, Y., Niu, Y., Cao, H., Liang, X., Chen, L., Wang, J., Peng, X.: Solution-processed, high-performance light-emitting diodes based on quantum dots. Nature 515, 96 (2014)CrossRefGoogle Scholar
  4. 4.
    Dai, X., Deng, Y., Peng, X., Jin, Y.: Quantum-dot light-emitting diodes for large-area displays: towards the dawn of commercialization. Adv. Mater. 29, 1607022 (2017)CrossRefGoogle Scholar
  5. 5.
    Litvin, A.P., Martynenko, I.V., Milton, F.P., Baranov, A.V., Fedorov, A.V., Gun’ko, Y.K.: Colloidal quantum dots for optoelectronics. J. Mater. Chem. A. 5, 13252 (2017)CrossRefGoogle Scholar
  6. 6.
    Han, C.-Y., Yang, H.: Development of colloidal quantum dots for electrically driven light-emitting devices. J. Korean Ceram. Soc. 54, 449 (2017)CrossRefGoogle Scholar
  7. 7.
    Cao, F., Zhao, D., Shen, P., Wu, J., Wang, H., Wu, Q., Wang, F., Yang, X.: High‐efficiency, solution‐processed white quantum dot light‐emitting diodes with serially stacked red/green/blue units. Adv. Opt. Mater. 6, 1800652 (2018)CrossRefGoogle Scholar
  8. 8.
    Lee, K.-H., Han, C.-Y., Jang, E.-P., Jo, J.-H., Hong, S., Hwang, J.Y., Choi, E., Hwang, J.-H., Yang, H.: Full-color capable light-emitting diodes based on solution-processed quantum dot layer stacking. Nanoscale 10, 6300 (2018)CrossRefGoogle Scholar
  9. 9.
    Lee, K.-H., Han, C.-Y., Kang, H.-D., Ko, H., Lee, C., Lee, J., Myoung, N., Yim, S.-Y., Yang, H.: Highly efficient, color-reproducible full-color electroluminescent devices based on red/green/blue quantum dot-mixed multilayer. ACS Nano 9(11), 10941 (2015)CrossRefGoogle Scholar
  10. 10.
    Leck, K.S., Divayana, Y., Zhao, D., Yang, X., Abiyasa, A.P., Mutlugun, E., Gao, Y., Liu, S., Tan, S.T., Sun, X.W., Demir, H.V., Appl, A.C.S.: Quantum dot light-emitting diode with quantum dots inside the hole transporting layers. Mater. Interfaces 5, 6535 (2013)CrossRefGoogle Scholar
  11. 11.
    Liu, G., Zhou, X., Sun, X., Chen, S.: Performance of inverted quantum dot light-emitting diodes enhanced by using phosphorescent molecules as exciton harvesters. J. Phys. Chem. C 120, 4667 (2016)CrossRefGoogle Scholar
  12. 12.
    Kim, J.W., You, S.I., Kim, N.H., Yoon, J.-A., Cheah, K.W., Zhu, F.R., Kim, W.Y.: Study of sequential dexter energy transfer in high efficient phosphorescent white organic light-emitting diodes with single emissive layer. Sci. Rep. 4, 7009 (2014)CrossRefGoogle Scholar
  13. 13.
    Zheng, T., Choy, W.C.H.: Red organic light emitting devices with reduced efficiency roll-off behavior by using hybrid fluorescent/phosphorescent emission structure. Thin Solid Films 519, 872 (2010)CrossRefGoogle Scholar
  14. 14.
    Mutlugun, E., Guzelturk, B., Abiyasa, A.P., Gao, Y., Sun, X.W., Demir, H.V.: Colloidal quantum dot light-emitting diodes employing phosphorescent small organic molecules as efficient exciton harvesters. J. Phys. Chem. Lett. 5, 2802 (2014)CrossRefGoogle Scholar

Copyright information

© The Korean Institute of Metals and Materials 2019

Authors and Affiliations

  1. 1.Department of Advanced Materials EngineeringKyonggi UniversitySuwonKorea

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