Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
권호 표지
DOI QR코드

DOI QR Code

Enhancing Performance of 1-aminopyrene Light-Emitting Diodes via Hybridization with ZnO Quantum Dots

  • Choi, Jong Hyun (Center for Opto-electronic Materials and Devices, Korea Institute of Science and Technology) ;
  • Kim, Hong Hee (Center for Opto-electronic Materials and Devices, Korea Institute of Science and Technology) ;
  • Choi, Won Kook (Center for Opto-electronic Materials and Devices, Korea Institute of Science and Technology)
  • Received : 2022.07.15
  • Accepted : 2022.07.30
  • Published : 2022.07.31
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, a pyrene-core single molecule with amino (-NH2) functional group material was hybridized using ZnO quantum dots (QDs). The suppressed performance of the 1-aminopyrene (1-PyNH2) single molecule as an emissive layer (EML) in light-emitting diodes (LEDs) was exploited by adopting the ZnO@1-PyNH2 core-shell structure. Unlike pristine 1-PyNH2 molecules, the ZnO@1-PyNH2 hybrid QDs formed energy proximity levels that enabled charge transfer. This result can be interpreted as an improvement in surface roughness. The uniform and homogeneous EML alleviates dark-spot degradation. Moreover, LEDs with the ITO/PEDOT:PSS/TFB/EML/TPBi/LiF/Al configuration were fabricated to evaluate the performance of two emissive materials, where pristine-1-PyNH2 molecules and ZnO@1-PyNH2 QDs were used as the EML materials to verify the improvement in electrical characteristics. The ZnO@1-PyNH2 LEDs exhibited blue luminescence at 443 nm (FWHM = 49 nm), with a turn-on voltage of 4 V, maximum luminance of 1500 cd/m2, maximum luminous efficiency of 0.66 cd/A, and power efficiency of 0.41 lm/W.

Keywords

Acknowledgement

This work was partially supported by the Materials, Components & Equipments Research Program, funded by the Gyeonggi Province (AICT11T2) and the KIST Institutional Program. This work was also partially supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Science and ICT (Grant No. 2021R1A66A3A01087644).

References

  1. C. W. Tang and S. A. VanSlyke, "Organic electroluminescent diodes", Appl. Phys. Lett., Vol. 51, No. 12, pp. 913- 915. 1987. https://doi.org/10.1063/1.98799
  2. J. Kang, K. M. Park, K. H. Lee, J. Y. Lee, and Y. Kang, "Improvement in color purity and lifetime of blue PHOLEDs using a homoleptic iridium (III) complex with fluorinated dibenzofuranyl-imidazole ligand", Dyes Pigm., Vol. 190, p. 109334, 2021. https://doi.org/10.1016/j.dyepig.2021.109334
  3. S. O. Jeon, K. S. Yook, C. W Joo, and J. Y. Lee, "High-Efficiency Deep-Blue-Phosphorescent Organic Light-Emitting Diodes Using a Phosphine Oxide and a Phosphine Sulfide High-Triplet-Energy Host Material with Bipolar ChargeTransport Properties", Adv.Mater., Vol. 22. No. 16, pp. 1872-1876, 2010. https://doi.org/10.1002/adma.200903321
  4. Q. Zhang, B. Li, S. Huang, H. Nomura, H. Tanaka, and C. Adachi, "Efficient blue organic light-emitting diodes employing thermally activated delayed fluorescence", Nat. Photonics, Vol. 8, No. 4, pp.326-332, 2014. https://doi.org/10.1038/nphoton.2014.12
  5. B. S. Kim, and J. Y. Lee, "Engineering of mixed host for high external quantum efficiency above 25% in green thermally activated delayed fluorescence device", Adv. Funct. Mater., Vol. 24, No. 25, pp. 3970-3977, 2014. https://doi.org/10.1002/adfm.201303730
  6. S. K. Kim, Y. I. Park, I. N. Kang, and J. W. Park, "New deep-blue emitting materials based on fully substituted ethylene derivatives", J. Mater. Chem., Vol. 17, No. 44, pp. 4670-4678, 2007. https://doi.org/10.1039/b706606f
  7. H. Jung, S. Kang, H. Lee, Y. J. Yu, J. H. Jeong, J. Song, Y. Jeon, and J. Park, "High efficiency and long lifetime of a fluorescent blue-light emitter made of a pyrene core and optimized side groups", ACS Appl. Mater. Interfaces, Vol. 10, No. 36, pp. 30022-30028, 2018. https://doi.org/10.1021/acsami.8b09013
  8. H. Aziz and Z. D. Popovic, "Degradation phenomena in small-molecule organic light-emitting devices", Chem. Mater., Vol. 16, No. 23, pp. 4522-4532, 2004. https://doi.org/10.1021/cm040081o
  9. H. Bolink, E. Barea, R. Costa, E. Coronado, S. Sudhakar, C. Zhen, A. Sellinger, "Efficient blue emitting organic light emitting diodes based on fluorescent solution processable cyclic phosphazenes", Org. Elect. Vol. 9, No. 2, pp. 155- 163, 2008. https://doi.org/10.1016/j.orgel.2007.10.005
  10. J. McElvain, H. Antoniadis, M. R. Hueschen, J. N. Miller, D. M. Roitman, J. R. Sheats, and R. L. Moon, "Formation and growth of black spots in organic light-emitting diodes", J. Appl. Phys., Vol. 80, No. 10, pp. 6002-6007, 1996. https://doi.org/10.1063/1.363598
  11. V. N. Savvate'ev, A. V. Yakimov, D. Davidov, R. M. Pogreb, R. Neumann, and Y. Avny, "Degradation of nonencapsulated polymer-based light-emitting diodes: Noise and morphology", Appl. Phys. Lett., Vol. 71, No. 23, pp. 3344-3346, 1997. https://doi.org/10.1063/1.120332
  12. L. M. Do, K. Kim, T. Zyung, H. K. Shim, and J. J. Kim, "In situ investigation of degradation in polymeric electroluminescent devices using time-resolved confocal laser scanning microscope", Appl. Phys. Lett., Vol. 70, No. 25, pp. 3470-3472. 1997. https://doi.org/10.1063/1.118516
  13. H. Aziz, Z. Popovic, C. P. Tripp, N. X. Hu, A. M. Hor, and G. Xu, "Degradation processes at the cathode/organic interface in organic light emitting devices with Mg: Ag cathodes", Appl. Phys. Lett., Vol. 72, No. 21, pp. 2642-2644, 1998. https://doi.org/10.1063/1.121442
  14. L. S. Liao, J. He, X. Zhou, M. Lu, Z. H. Xiong, Z. B. Deng, X. Y. Hou, and S. T. Lee, "Bubble formation in organic light-emitting diodes", J. Appl. Phys., Vol. 88, No. 5, pp. 2386-2390. 2000. https://doi.org/10.1063/1.1286009
  15. M. Schaer, F. Nuesch, D. Berner, W. Leo, and L. Zuppiroli, "Water vapor and oxygen degradation mechanisms in organic light emitting diodes", Adv. Funct. Mater., Vol. 11, No. 2, pp. 116-121, 2001. https://doi.org/10.1002/1616-3028(200104)11:2<116::AID-ADFM116>3.0.CO;2-B