White Light Generation from Electroluminescence Devices Using TPD:PMMA/QDs/Alq3

Abstract:

Article Preview

Quantum dots of CdSe, CdS and ZnS QDs were prepared by chemical reaction and used to fabricate organic quantum dot hybrid junction device. QD-LEDs were fabricated using layers of ITO/TPD: PMMA/CdSe/Alq3, ITO/TPD: PMMA/CdS/Alq3 and ITO/TPD: PMMA/ZnS/Alq3 devices which prepared by phase segregation method. The hybrid white light emitting devices consists, of three-layers deposited successively on the ITO glass substrate; the first layer was of N, N’-bis (3-methylphenyl)-N, N’-bis (phenyl) benzidine (TPD) polymer mixed with polymethyl methacrylate (PMMA) polymers. The second layer was QDs while the third layer was tris (8-hydroxyquinoline) aluminium (Alq3). The results of the optical properties show that the prepared QDs were nanocrystalline with defects formation. The calculated of energy gaps from photoluminescence (PL) spectrometer were 2.38, 2.69 and 3.64 eV for CdSe, CdS and ZnS respectively. The generated white light has acceptable efficiency using confinement effect which makes the energy gap larger, so that the direction of the light sites are toward the center of white light color. The hybrid junction devices (EL devices) were characterized by room temperature PL and electroluminescence (EL). Current-voltage (I–V) characteristics indicate that the output current is good compared to the few voltages ( 8-10.3 V) used which gives acceptable results to get a generation of white light. The EL spectrum reveals a broad emission band covering the range from 350 - 700 nm. The emissions causing this white luminescence were identified depending on the chromaticity coordinates (CIE 1931). The correlated color temperature (CCT) was found to be about 6250, 5310 and 5227K respectively. Fabrication of EL-devices from semiconductors material (CdSe, CdS and ZnS QDs) with hole injection organic polymer (TPD) and electron injection from organic molecules (Alq3) was effective in white light generation

Info:

Periodical:

Pages:

10-20

Citation:

O. A. Ibrahim et al., "White Light Generation from Electroluminescence Devices Using TPD:PMMA/QDs/Alq3", Nano Hybrids and Composites, Vol. 15, pp. 10-20, 2017

Online since:

May 2017

Export:

Price:

$38.00

* - Corresponding Author

[1] K. S. Lee, D. U. Lee, D. C. Choo, T. W. Kim, E. D. Ryu, S. W. Kim, J. S. Lim, Organic Light-Emitting Devices Fabricated Utilizing Core/Shell CdSe/ZnS Quantum Dots Embedded in A polyvinylcarbazole, J. Mater Sci, 46, 1(2011), 239-1243.

DOI: https://doi.org/10.1007/s10853-010-4903-8

[2] J. Wang et al., Emission Colour-Tunable Phosphorescent Organic Light-Emitting Diodes Based on the Self-Absorption Effect and Excimer Emission, J. Pys. D: App. Phys., 46, (2013), 015104.

DOI: https://doi.org/10.1088/0022-3727/46/1/015104

[3] J .Y. Tsao et al., Light Emitted Diodes (LEDs) for General Illumination. OIDA, technology report, Sandia National Laboratories, J. Phys. D: Appl. Phys. 43, (2010), 354001.

[4] C. W. Tang and S. A. VanSlyke, Organic Electroluminescent Diodes, Appl. Phys. Lett., 51, (1987), 12.

[5] J. E. Knox,W. M. D. Halls, H. P. Hratchianz and H. B. Schlegel, Chemical Failure Modes of AlQ3-Based OLEDs: AlQ3 Hydrolysis, Phys. Chem. Chem. Phys., 8, (2006), 1371-1377.

DOI: https://doi.org/10.1039/b514898g

[6] A. M. Suhail, A. M. Kadim, O. A. Ibrahim, H. I. Murad, CdSe/ZnS Core-Shell System Enhance the Efficiency of the White Light Generation, Applied Physics Research, 4, (2012).

DOI: https://doi.org/10.5539/apr.v4n1p57

[7] M. D. Halls and H. B. Schlegel, Molecular Orbital Study of the First Excited State of the OLED Material Tris(8-hydroxyquinoline)aluminum(III), Chem. Mater., 13, (2001), 2632-2640.

DOI: https://doi.org/10.1021/cm010121d

[8] M. Cuba, G. Muralidharan, Enhanced Luminescence Properties of Hybrid Alq3/ZnO (Organic/Inorganic) Composite Films. Journal of Luminescence, 156, (2014), 1-7.

DOI: https://doi.org/10.1016/j.jlumin.2014.07.008

[9] V. Wood and V. Bulovic, Colloidal Quantum Dot Light-Emitting Devices, Nano Reviews, 1, (2010), 5202.

DOI: https://doi.org/10.3402/nano.v1i0.5202

[10] H. Krueger et al., Hole-Transporting Host-Polymer Series Consisting of Triphenylamine Basic Structures for Phosphorescent Polymer Light-Emitting Diodes, Journal of Polymer Science: Part A: Polymer Chemistry, 48, (2010), 3417–3430.

DOI: https://doi.org/10.1002/pola.24127

[11] W. R. Zeng, S. F. Li and W. K. Chow, Preliminary Studies on Burning Behavior of Polymethylmethacrylate (PMMA), Journal of Fire Sciences, 20, (2002), 297.

DOI: https://doi.org/10.1177/073490402762574749

[12] Y. Karzazi, Organic Light Emitting Diodes: Devices and Applications, J. Mater. Environ. Sci., 5, 1, (2014), 1-12.

[13] S. Coe-Sullivan, W. Woo, J. S. Steckel, M. Bawendi, V. Bulovic, Tuning the Performance of Hybrid Organic/Inorganic Quantum Dot Light-Emitting Devices, Org. Electron, 4, (2003), 123-130.

DOI: https://doi.org/10.1016/j.orgel.2003.08.016

[14] R. Litrán et al., Preparation and Characterization of Fluorescent CdS Quantum Dots used for the Direct Detection of GST Fusion Proteins, Nanomater. nanotechnol., 2, (2012).

[15] S. Ravi, B. P. Chandra, D. P. Bisen, Thermo Luminescence and Optical Absorption Spectra of ZnS: Mn Nanoparticles, Chalcogenide Letters, 6, 6, (2009), 251-255.

[16] C. S. Pathak, M. K. Mandal, Enhanced Photoluminescence Properties of Mn+2 Doped ZnS Nanoparticles, Chalcogenide Letters, 8, 3, (2011), 147-153.

[17] Y. Y. Bacherikov, M. O. Davydenko, S. V. Optasyuk, I. M. Dmitruk, Photoluminescence of CdSe Nanoparticles in Electric Field, Ukr. J. Phys., 52, 12, (2007), 1188-1192.

[18] O. A. Ibrahim, Electroluminescence of white light from ZnO nanostructures/TPD hybrid, Ph.D. Thesis, University of Baghdad, Baghdad, Iraq, (2015).

[19] S. M. Sze and K. K. Ng, Physics of Semiconductor Devices, third ed., John Wiley and Sons, New York, (2007).

[20] Za'aba et al., Electronic Device Characteristics and Charge Conduction Mechanisms of Single-Layer Organic Light Emitting Devices Based on Alq3, TPD: Alq3 and TPD: PBD: Alq3 Blend System, Journal of Nanoelectronics and Optoelectronics, 8, (2013).

[21] T. Chiba, Y. J. Pu, H. Sasabe, J. Kido, Y. Yang, Solution-Processed Organic Light-Emitting Devices With Two Polymer Light-Emitting Units Connected in Series by A charge-Generation Layer, Journal of Materials Chemistry, (2012), 1-5.

DOI: https://doi.org/10.1039/c2jm35344j

[22] J. Schanda, Colorimetry: Understanding the CIE System, first ed., John Wiley, (2008).

[23] C. Li, G. Cui, M. Melgosa, X. Ruan, Y. Zhang, L. Ma, K. Xiao and M. R. Luo, Correlated Color Temperature as An Explicit Function of Chromaticity Coordinates, Optical Society of America (Optics Express), 24, (2016), 13.

Fetching data from Crossref.
This may take some time to load.