A Two-Dimensional Photonic Crystal Structure for Improving Efficiency of Pbs Quantum Dots Electroluminescence Devices

Abstract:

In this research, a triangular two-dimensional (2D) photonic crystal (PC) was hypothetically introduced into the active layer of a PbS quantum dots (QDs) electroluminescent (EL) device. The attributes of the photonic band gap effect and diffraction effect were considered and evaluated for device performance improvement. We designed and optimized the 2D-PC structure parameters to enhance the emission intensity at wavelength 1124 nm. The optimal structure parameter of PC is determined by normalized radius of r/a=0.49 and lattice constant of a=540 nm when the thickness of PC slab h is 74 nm. The 3D stimulation view of light propagation validates and supports the proposed strategy. The results provide a theoretical prediction for ideal PbS QDs-based EL device.

• Periodical: Advanced Materials Research (Volume 529)
• Pages: 14-18
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.529.14
• Online since: June 2012
• Authors: Pei Liu, Xiao Song Zhang, Chuan Zhen Xin, Meng Zhen Li, Lan Li
• Keywords: Diffraction, Pbs Qds EL Device, Photonic Bandgap, Photonic Crystal (PC), Reflectivity

References

[1] X. Zhang, X. Dong, Y. Liu, G. Kai, Z. Wang, L. Li, X. Han and Y. Li: Near-infrared emission from PbS quantum dots in polymer matrix, Opt. Lett. Vol. 3 (2007), p.337.

DOI: 10.1007/s11801-007-7025-z

[2] Z. Wang, S. Qu, X. Zeng, C. Zhang, M. Shi, F. Tan, J. Liu, Y. Hou and F. Teng: Synthesis of MDMO-PPV capped PbS quantum dots and their application to solar cells, Polymer Vol. 49 (2008), p.4647.

DOI: 10.1016/j.polymer.2008.08.041

[3] F. Xu, X. Ma and S. G. Cloutier: Highly efficient near-infrared electroluminescence devices based on PbS nanocrystals, in Rochester, New York, Optics in Micro/nano Devices (2010).

DOI: 10.1364/fio.2010.fthaa3

[4] S. Fan, P. R. Villeneuve, J. Joannopoulos and E. Schubert: High extraction efficiency of spontaneous emission from slabs of photonic crystals, Phys. Rev. Lett. Vol. 78 (1997), p.3294.

DOI: 10.1103/physrevlett.78.3294

[5] M. Fujita, S. Takahashi, Y. Tanaka, T. Asano and S. Noda: Simultaneous inhibition and redistribution of spontaneous light emission in photonic crystals, Science Vol. 308(2005), p.1296.

DOI: 10.1126/science.1110417

[6] J. J. Wierer, A. David and M. M. Megens: III-nitride photonic-crystal light-emitting diodes with high extraction efficiency, Nat. photonics Vol. 3(2009), p.163.

DOI: 10.1038/nphoton.2009.21

[7] H. W. Liu, Q. Kan, C. X. Wang, H. Y. Hu, X. S. Xu and H. D. Chen: Light Extraction Enhancement of GaN LED with a Two-Dimensional Photonic Crystal Slab, Chin. Phys. Lett. Vol. 28(2011), p.054216.

DOI: 10.1088/0256-307x/28/5/054216

[8] E. Purcell: Spontaneous emission probabilities at radio frequencies, Phys. Rev. Vol. 69(1946), p.681.

[9] A. David, H. Benisty and C. Weisbuch: Fast factorization rule and plane-wave expansion method for two-dimensional photonic crystals with arbitrary hole-shape, Phys. l Rev. B Vol. 73(2006), p.075107.

DOI: 10.1103/physrevb.73.075107

[10] G. Von Freymann, W. Koch, D. Meisel, M. Wegener, M. Diem, A. Garcia-Martin, S. Pereira, K. Busch, J. Schilling and R. Wehrspohn: Diffraction properties of two-dimensional photonic crystals, Appl. Phys. Lett. Vol. 83(2003), p.614.

DOI: 10.1063/1.1596731